From 4f4c108d9b62d5b9beebccbe10ca9da4d836717a Mon Sep 17 00:00:00 2001
From: JS snippets <56507838+JSsnippets@users.noreply.github.com>
Date: Mon, 21 Oct 2019 18:56:26 +0300
Subject: [PATCH 01/62] add Logo.png

---
 Logo.png | Bin 0 -> 22845 bytes
 1 file changed, 0 insertions(+), 0 deletions(-)
 create mode 100644 Logo.png

diff --git a/Logo.png b/Logo.png
new file mode 100644
index 0000000000000000000000000000000000000000..73c4452fa94f2d15ff1424aa7f653995dd52fa98
GIT binary patch
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z3g?!O7ibfB89SB;OJO_$jK#2*HN9Fy+ThvB0J_#hC(?>B&Z@^oo(HAKZCQPpU<2Vk
z9*+Chb^cQOFPDX>$=I8=1lvEYg|I42gT-VQHd)P2wn{lXP<t{W?F0b2xD*f<kE7p=
z;f@d6*KshO$FUT>5jWMtMmI?e&Uwu#h7|rH?Jy$7T7~WCW;?KNZbu%v!Xk{r+OP#)
z8-UeM`p3&f5<{dVk(8ML*T~ehG6mr5`=QTvk-1H0UFIZN6yn%SyUl&!xKxG{QWCC`
z0>lr6^Q049V-y}MAAcQTbdlKY96L#4BbJx|PYC%^2=A3lMe&CnfRk})a%b=*z>n)9
zfVC|dmHwE)Z-v)tOL43PfTOouDBKf0w|sr|`aJ_MHlTuRA?mz9f<WshMWGhi7seKM
zp{)R0F~(a7X~vi>5^9yaPyzmO0Z=3fjNB6`OoO1yO{CiKXP|19b*Y0gA~g$LBF9+<
ztOc?FFLC$H!F;ZL?7EBLETb=<2{hIZZ_B2^Ch%&@omblpuvN*{P#Ml5Bhj($4%G|q
z0lEh4@C(m0DAg?SR4wB4RO6*NwF0D*unqNEnddwffkp238o0F1JibRmHqdAU^=u;Z
zFkV|8nuU}NxC8CUJRVT90is3V`(IE6?bW04f`spdxB-rJRqtlCUSN@&^FnuR9?CM`
gi=N8ro_qfP0j$Qd(=ZSSi2wiq07*qoM6N<$f-GD3_y7O^

literal 0
HcmV?d00001


From ac9513702c8e4e2e866ef20d6024668f84a88abb Mon Sep 17 00:00:00 2001
From: JS snippets <56507838+JSsnippets@users.noreply.github.com>
Date: Mon, 21 Oct 2019 18:58:56 +0300
Subject: [PATCH 02/62] add Logo

---
 README.md | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/README.md b/README.md
index dc381a3..6072d7d 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,8 @@
 # JavaScript-snippets
+<img src="Logo.png" alt="JS snippets logo">
+
+# JSsnippets on Facebook
+
 find us on [Facebook](https://www.facebook.com/snippetsJS)
 
 

From bf89592122b81864fcbdd390ac2f3a576faafe5e Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Sun, 27 Oct 2019 10:39:52 +0200
Subject: [PATCH 03/62]  Nested Destructuring

---
 README.md | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/README.md b/README.md
index 6072d7d..fa8f753 100644
--- a/README.md
+++ b/README.md
@@ -180,3 +180,19 @@ function copyToClipboard(){
 
 ```
 
+#  Nested Destructuring
+
+
+```javascript
+const user = {
+ id: 459,
+ name: 'JS snippets',
+ age:29,
+ education:{
+  degree: 'Masters'
+ }
+}
+
+const { education : { degree } }
+console.log(degree) //Masters
+```

From 8346b544043be60a83db8b3f8ef5183819c7f8ef Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Mon, 4 Nov 2019 12:20:00 +0200
Subject: [PATCH 04/62] URLSearchParams snippet

---
 README.md | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/README.md b/README.md
index fa8f753..ce1733e 100644
--- a/README.md
+++ b/README.md
@@ -196,3 +196,22 @@ const user = {
 const { education : { degree } }
 console.log(degree) //Masters
 ```
+
+#  URLSearchParams 
+
+
+```javascript
+//The URLSearchParams interface defines utility methods to work with the query string of a URL.
+
+const urlParams = new URLSearchParams("?post=1234&action=edit");
+
+console.log(urlParams.has('post')); // true
+console.log(urlParams.get('action')); // "edit"
+console.log(urlParams.getAll('action')); // ["edit"]
+console.log(urlParams.toString()); // "?post=1234&action=edit"
+console.log(urlParams.append('active', '1')); // "?post=1234&action=edit&active=1"
+```
+
+
+
+

From 497341578741e84451e6dbe95df43ad28443143a Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Mon, 4 Nov 2019 17:38:31 +0200
Subject: [PATCH 05/62] update Nested Destructuring

---
 README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/README.md b/README.md
index ce1733e..ec1f535 100644
--- a/README.md
+++ b/README.md
@@ -193,7 +193,7 @@ const user = {
  }
 }
 
-const { education : { degree } }
+const { education : { degree } } = user;
 console.log(degree) //Masters
 ```
 

From 548d9ae0e8492395083f03b5f2fc40b655c75ec2 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Sun, 10 Nov 2019 17:06:30 +0200
Subject: [PATCH 06/62] Shuffle an array

---
 README.md | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/README.md b/README.md
index ec1f535..01b5f08 100644
--- a/README.md
+++ b/README.md
@@ -213,5 +213,17 @@ console.log(urlParams.append('active', '1')); // "?post=1234&action=edit&active=
 ```
 
 
+#  Shuffle an array 
 
 
+```javascript
+const list = [1,2,3,4,5,6,7,8,9];
+const shuffle = list.sort(func);
+
+function func(a,b){
+  return 0.5 - Math.random();
+}
+
+console.log(shuffle);
+```
+

From dcb6e6b59bf2afa84d396efbe63f903d9a46dfcf Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Sun, 17 Nov 2019 13:44:42 +0200
Subject: [PATCH 07/62] Count elements in an array

---
 README.md | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/README.md b/README.md
index 01b5f08..35e12e8 100644
--- a/README.md
+++ b/README.md
@@ -227,3 +227,27 @@ function func(a,b){
 console.log(shuffle);
 ```
 
+#  Count elements in an array
+
+
+```javascript
+const myFruits = ['Apple','Orange','Mango','Banana','Apple','Apple','Mango']
+
+//first option
+const countMyFruits = myFruits.reduce((countFruits,fruit) => {
+  countFruits[fruit] = ( countFruits[fruit] || 0 ) +1;
+  return countFruits
+ },{} )
+ console.log(countFruits)
+ // { Apple:3, Banana:1, Mango:2, Orange:1 }
+ 
+ //seconf option
+ const fruitsCounter = {};
+ 
+ for( const fruit of myFruits ){
+   fruitsCounter[fruit] = fruitsCounter[fruit] ? fruitsCounter[fruit]+1 :1;
+ }
+  
+ console.log(fruitsCounter)
+ // { Apple:3, Banana:1, Mango:2, Orange:1 }
+```

From 444412a6c7994f568ad50b9030c66e777861a928 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Sun, 17 Nov 2019 13:57:14 +0200
Subject: [PATCH 08/62] Update Count elements in an array

---
 README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 35e12e8..f879d76 100644
--- a/README.md
+++ b/README.md
@@ -238,7 +238,7 @@ const countMyFruits = myFruits.reduce((countFruits,fruit) => {
   countFruits[fruit] = ( countFruits[fruit] || 0 ) +1;
   return countFruits
  },{} )
- console.log(countFruits)
+ console.log(countMyFruits)
  // { Apple:3, Banana:1, Mango:2, Orange:1 }
  
  //seconf option

From 63d7d7d07c2a41294a66409b9260d68e7f25c255 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Sun, 24 Nov 2019 10:54:11 +0200
Subject: [PATCH 09/62]  Aliases with JavaScript Destructuring

---
 README.md | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/README.md b/README.md
index f879d76..d0b5711 100644
--- a/README.md
+++ b/README.md
@@ -251,3 +251,24 @@ const countMyFruits = myFruits.reduce((countFruits,fruit) => {
  console.log(fruitsCounter)
  // { Apple:3, Banana:1, Mango:2, Orange:1 }
 ```
+
+
+#  Aliases with JavaScript Destructuring
+
+
+```javascript
+
+//There are cases where you want the destructured variable to have a different name than the property name
+
+const obj = { 
+  name: "JSsnippets"													
+};
+
+
+// Grabs obj.name as { pageName }
+const { name: pageName } = obj;
+
+//log our alias
+console.log(pageName) // JSsnippets
+```
+

From b2f9c888a366304531b8e948ee5b044a55e750c6 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Mon, 2 Dec 2019 13:55:26 +0200
Subject: [PATCH 10/62] Object.is

---
 README.md | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/README.md b/README.md
index d0b5711..664295d 100644
--- a/README.md
+++ b/README.md
@@ -272,3 +272,21 @@ const { name: pageName } = obj;
 console.log(pageName) // JSsnippets
 ```
 
+
+
+#  The Object.is() method determines whether two values are the same value
+
+
+```javascript
+Object.is('foo', 'foo');     // true
+
+Object.is(null, null);       // true
+
+Object.is(Nan, Nan);       // true 😱
+
+const foo = { a: 1 };
+const bar = { a: 1 };
+Object.is(foo, foo);         // true
+Object.is(foo, bar);         // false
+
+```

From c5873fe1ee03c15cc8da493491967e8ccad23b03 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Sun, 8 Dec 2019 10:11:23 +0200
Subject: [PATCH 11/62] How can we freeze an object

---
 README.md | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/README.md b/README.md
index 664295d..ecd9cda 100644
--- a/README.md
+++ b/README.md
@@ -290,3 +290,36 @@ Object.is(foo, foo);         // true
 Object.is(foo, bar);         // false
 
 ```
+
+
+
+#  How can we freeze an object
+
+
+```javascript
+const obj = { 
+  name: "JSsnippets",
+  age:29,
+  address:{
+	  street : 'JS'
+	}
+};														
+
+const frozenObject = Object.freeze(obj);
+
+frozenObject.name = 'weLoveJS'; // Uncaught TypeError
+
+//Although, we still can change a property’s value if it’s an object:
+
+frozenObject.address.street = 'React'; // no error, new value is set
+
+
+delete frozenObject.name // Cannot delete property 'name' of #<Object>
+
+
+//We can check if an object is frozen by using
+Object.isFrozen(obj) //true
+
+```
+
+

From 1a07fa7807e2cb585352884bfaa9a2805d4f2084 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Thu, 19 Dec 2019 10:46:04 +0200
Subject: [PATCH 12/62] Printing Object keys and values

---
 README.md | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/README.md b/README.md
index ecd9cda..0c24c51 100644
--- a/README.md
+++ b/README.md
@@ -323,3 +323,25 @@ Object.isFrozen(obj) //true
 ```
 
 
+#  Printing Object keys and values
+
+
+```javascript
+const obj = { 
+  name: "JSsnippets",
+  age:29,
+};
+
+//Object.entries() method is used to return an array consisting of enumerable property 
+//[key, value] pairs of the object which are passed as the parameter.
+
+for(let [key,value] of Object.entries(obj)){
+   console.log(`${key}: ${value}`)
+}
+
+//expected output:
+// "name: Jssnippets"
+// "age: 29"
+// order is not guaranteed
+
+```

From 242c2f96c6bc86e948d0a191cdbcab6ca437a291 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Mon, 23 Dec 2019 20:05:19 +0200
Subject: [PATCH 13/62] Capture the right click event

---
 README.md | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/README.md b/README.md
index 0c24c51..b912f24 100644
--- a/README.md
+++ b/README.md
@@ -345,3 +345,17 @@ for(let [key,value] of Object.entries(obj)){
 // order is not guaranteed
 
 ```
+#  Capture the right click event
+
+```javascript
+window.oncontextmenu = () => {
+	console.log('right click');
+	return false // cancel default menu
+}
+//or
+
+window.addEventListener('contextmenu', ()=>{
+	console.log('right click');
+	return false // cancel default menu
+},false)
+```

From ad8e0c80b6a0bb3adc60e3a0b6fc63f877b03b7b Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Sun, 5 Jan 2020 10:03:31 +0200
Subject: [PATCH 14/62] async vs defer js

---
 README.md | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/README.md b/README.md
index b912f24..c5ee8af 100644
--- a/README.md
+++ b/README.md
@@ -359,3 +359,18 @@ window.addEventListener('contextmenu', ()=>{
 	return false // cancel default menu
 },false)
 ```
+
+
+#  In HTML5, you can tell the browser when to run your JavaScript code
+```javascript
+
+//Without async or defer, browser will run your script immediately, before rendering the elements that's below your script tag.
+<script src="myscript.js"></script>
+
+//With async (asynchronous), browser will continue to load the HTML page and render it while the browser load and execute the script at the same time.
+//Async is more useful when you really don't care when the script loads and nothing else that is user dependent depends upon that script loading.(for scripts likes Google analytics)
+<script async src="myscript.js"></script>
+
+//With defer, browser will run your script when the page finished parsing. (not necessary finishing downloading all image files. 
+<script defer src="myscript.js"></script>
+```

From 622978b01af6187f5113457be41d6ec736e5517f Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Tue, 14 Jan 2020 11:43:22 +0200
Subject: [PATCH 15/62]  nullish coalescing operator

---
 README.md | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/README.md b/README.md
index c5ee8af..8e0f49c 100644
--- a/README.md
+++ b/README.md
@@ -374,3 +374,19 @@ window.addEventListener('contextmenu', ()=>{
 //With defer, browser will run your script when the page finished parsing. (not necessary finishing downloading all image files. 
 <script defer src="myscript.js"></script>
 ```
+
+#   nullish coalescing operator
+```javascript
+
+// an equality check against nullary values (e.g. null or undefined). Whenever the expression to the left of the ?? operator evaluates to either //undefined or null, the value defined to the right will be returned.
+
+const foo = undefined ?? 'default string';
+console.log(foo);
+// expected output: "default string"
+
+
+const age = 0 ?? 30;
+console.log(age);
+// expected output: "0"
+```
+

From 7cbb2652aef614da81f4bdd67f70dfc213ff383d Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Tue, 28 Jan 2020 12:20:19 +0200
Subject: [PATCH 16/62] optional chaining

---
 README.md | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/README.md b/README.md
index 8e0f49c..b12a25b 100644
--- a/README.md
+++ b/README.md
@@ -390,3 +390,25 @@ console.log(age);
 // expected output: "0"
 ```
 
+#  Optional chaining
+```javascript
+
+const car = {}
+const carColor = car.name.color
+console.log(carColor);
+// error- "Uncaught TypeError: Cannot read property 'carColor' of undefined		
+
+//In JavaScript, you can first check if an object exists, and then try to get one of its properties, like this:
+const carColor = car && car.name && car.name.color;
+console.log(carColor);
+//undefined- no error
+
+
+//Now this new optional chaining operator will let us be even more fancy:
+
+const newCarColor = car?.name?.color;
+console.log(newCarColor) 
+//undefined- no error
+					
+//You can use this syntax today using @babel/plugin-proposal-optional-chaining
+```

From 345f6cdac3e73a365a7c49035fb3bc716cfda9ce Mon Sep 17 00:00:00 2001
From: JS snippets <56507838+JSsnippets@users.noreply.github.com>
Date: Thu, 13 Feb 2020 13:05:46 +0200
Subject: [PATCH 17/62] globalThis

---
 README.md | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/README.md b/README.md
index b12a25b..2306b44 100644
--- a/README.md
+++ b/README.md
@@ -412,3 +412,22 @@ console.log(newCarColor)
 					
 //You can use this syntax today using @babel/plugin-proposal-optional-chaining
 ```
+
+#  globalThis
+```javascript
+Accessing the global property in JavaScript has always posed some difficulty. This is because 
+different platforms have different ways to access it.
+
+Client-side JavaScript uses window or self
+
+Node.js uses global
+
+Web workers use self
+
+The globalThis property provides a standard way of accessing the global 'this' value across environments. you can access the global object in a consistent manner without having to know which environment the code is being run in. 
+
+console.log(globalThis) //get the global this depends on your environment
+
+```
+
+

From b29c5bc57c113ead1fdbe436b1dbef81d9e08273 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Tue, 25 Feb 2020 10:39:30 +0200
Subject: [PATCH 18/62] JSON.stringify keys to serialize.

---
 README.md | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/README.md b/README.md
index 2306b44..2bb1aac 100644
--- a/README.md
+++ b/README.md
@@ -431,3 +431,29 @@ console.log(globalThis) //get the global this depends on your environment
 ```
 
 
+
+#  The second argument of JSON.stringify lets you cherry-pick 🍒 keys to serialize.
+```javascript
+const user = {
+ id: 459,
+ name: 'JS snippets',
+ age:29,
+ education:{
+  degree: 'Masters'
+ }
+}
+
+JSON.stringify(user,[name,age], 2)						
+
+/*
+returns
+
+{
+  "name": "JS snippets",
+  "age": 29
+}
+
+
+*/
+
+```

From 403151bad4a7ffd9dbe81caa0ea6e821609c5371 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Tue, 10 Mar 2020 12:01:21 +0200
Subject: [PATCH 19/62] Fire an event listener only once.

---
 README.md | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/README.md b/README.md
index 2bb1aac..0b4a10c 100644
--- a/README.md
+++ b/README.md
@@ -457,3 +457,22 @@ returns
 */
 
 ```
+
+
+#  Fire an event listener only once.
+```javascript
+const el = document.getElementById("btn");
+
+function myClickHandler(){
+  console.log('this click will only fire once')
+}
+
+
+el.addEventListener('click', myClickHandler, {
+  once: true,
+});
+
+```
+
+
+

From f2ed727ccdffae3326fb24bfa309c32dffab3b08 Mon Sep 17 00:00:00 2001
From: JS snippets <56507838+JSsnippets@users.noreply.github.com>
Date: Mon, 23 Mar 2020 09:15:46 +0200
Subject: [PATCH 20/62] Create License

---
 LICENSE | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 LICENSE

diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..6b2982b
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2020 JS snippets
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

From 7b59f88e2a3b5e0412688b78048c13a8883df349 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Tue, 24 Mar 2020 10:48:36 +0200
Subject: [PATCH 21/62] Vanilla JS toggle

---
 README.md | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/README.md b/README.md
index 0b4a10c..2038607 100644
--- a/README.md
+++ b/README.md
@@ -474,5 +474,21 @@ el.addEventListener('click', myClickHandler, {
 
 ```
 
+#  Vanilla JS toggle
+```javascript
+const span = document.querySelector("span");
+let classes = span.classList;
+
+span.addEventListener("click", function() {
+  let result = classes.toggle("active");
+
+  if (result) {
+    console.log("active class was added");
+  } else {
+    console.log("active class was removed");
+  }
+});
+
+```
 
 

From 9f0b20d6a917f1402cd900160d9248b006b84175 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Tue, 7 Apr 2020 10:06:48 +0300
Subject: [PATCH 22/62] Check if a string is a valid JSON

---
 README.md | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/README.md b/README.md
index 2038607..63a293b 100644
--- a/README.md
+++ b/README.md
@@ -490,5 +490,21 @@ span.addEventListener("click", function() {
 });
 
 ```
+# Check if a string is a valid JSON
+
+```javascript
+function isJson(str) {
+    try {
+        JSON.parse(str);
+    } catch (e) {
+      //the json is  not ok
+        return false;
+    }
+    //the json is ok
+    return true;									
+}
+```
+
+
 
 

From b178daefe3dda0f6330641510b5047a0e80c30b6 Mon Sep 17 00:00:00 2001
From: adrianprzybyla <adrian.przybyla@o2.pl>
Date: Wed, 15 Apr 2020 20:54:01 +0200
Subject: [PATCH 23/62] Fix

---
 README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 63a293b..4b8f9dc 100644
--- a/README.md
+++ b/README.md
@@ -120,7 +120,7 @@ console.log(muatatedArray) //['a','b','d','e']
 
 //Non-mutating way
 const nonMuatatedArray = ['a','b','c','d','e'];
-const newArray = nonMuatatedArray.filter((item'index) => !( index === 2 ));
+const newArray = nonMuatatedArray.filter((item, index) => !( index === 2 ));
 console.log(newArray) //['a','b','d','e']
 ```
 

From a23d6482fe537d0a79c6f530d55ed0c50eaa7588 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Sun, 10 May 2020 15:00:48 +0300
Subject: [PATCH 24/62] getBoundingClientRect

---
 README.md | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/README.md b/README.md
index 4b8f9dc..3bda4ae 100644
--- a/README.md
+++ b/README.md
@@ -505,6 +505,26 @@ function isJson(str) {
 }
 ```
 
+# getBoundingClientRect
+
+```javascript
+//getBoundingClientRect provides you with important pieces of data about an
+//HTML element’s size and positioning.
+
+const bodyBounderies = document.body.getBoundingClientRect();
+// =>  {
+//       top: Number,
+//       left: Number,
+//       right: Number,
+//       bottom: Number,
+//       x: Number,
+//       y: Number,
+//       width: Number,
+//       height: Number,
+//     }
+```
+
+
 
 
 

From 603fba54957aa8608b11f6f9aea205c81e5719ae Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Tue, 12 May 2020 12:32:39 +0300
Subject: [PATCH 25/62] check if a node is in the viewport

---
 README.md | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/README.md b/README.md
index 3bda4ae..958abe1 100644
--- a/README.md
+++ b/README.md
@@ -525,6 +525,23 @@ const bodyBounderies = document.body.getBoundingClientRect();
 ```
 
 
+# Check if a node is in the viewport
 
+```javascript
+const image = document.querySelector('.animate-me');
+
+observer = new IntersectionObserver((entries) => {
+  const [ myImg ] = entries;
+    if (myImg.intersectionRatio > 0) {
+      myImg.target.classList.add('fancy');
+    } else {
+      myImg.target.classList.remove('fancy');
+    }
+});
+
+
+observer.observe(image);
+
+```
 
 

From 453dca05821db6ff597f33bd4935c51b38abe644 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Tue, 12 May 2020 12:33:49 +0300
Subject: [PATCH 26/62] add animation if an image is in the viewport

---
 README.md | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 958abe1..fcb9026 100644
--- a/README.md
+++ b/README.md
@@ -526,7 +526,8 @@ const bodyBounderies = document.body.getBoundingClientRect();
 
 
 # Check if a node is in the viewport
-
+bonus: add/remove animation depending if an image is in the viewport
+https://codepen.io/JSsnippets/pen/PoqrjEY
 ```javascript
 const image = document.querySelector('.animate-me');
 

From febc57912875ef6ba23ef5f5308dba094f67022c Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Thu, 14 May 2020 12:14:32 +0300
Subject: [PATCH 27/62] update ReadMe

---
 README.md | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/README.md b/README.md
index fcb9026..8550e62 100644
--- a/README.md
+++ b/README.md
@@ -1,13 +1,18 @@
 # JavaScript-snippets
+> Click :star:if you like the project. Pull Request are highly appreciated. Follow us [Facebook](https://www.facebook.com/snippetsJS) on Facebook.
 <img src="Logo.png" alt="JS snippets logo">
 
-# JSsnippets on Facebook
 
-find us on [Facebook](https://www.facebook.com/snippetsJS)
 
+### Table of Contents
+| No. | Questions |
+|---- | ---------
+|1  | [What are the possible ways to create objects in JavaScript?](#How-to-generate-a-random-number-in-a-given-range) |
+|2  | [What is prototype chain?](#what-is-prototype-chain)|
 
-# How to generate a random number in a given range
 
+**[⬆ Back to Top](#table-of-contents)**
+### How to generate a random number in a given range
 ```javascript
 // Returns a random number(float) between min (inclusive) and max (exclusive) 
 

From 238a146d9571625b28d18b531292cb39aeeb3c88 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Thu, 14 May 2020 12:16:46 +0300
Subject: [PATCH 28/62] update readme

---
 README.md | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/README.md b/README.md
index 8550e62..7bc0049 100644
--- a/README.md
+++ b/README.md
@@ -1,14 +1,11 @@
 # JavaScript-snippets
 > Click :star:if you like the project. Pull Request are highly appreciated. Follow us [Facebook](https://www.facebook.com/snippetsJS) on Facebook.
-<img src="Logo.png" alt="JS snippets logo">
-
-
 
 ### Table of Contents
 | No. | Questions |
 |---- | ---------
-|1  | [What are the possible ways to create objects in JavaScript?](#How-to-generate-a-random-number-in-a-given-range) |
-|2  | [What is prototype chain?](#what-is-prototype-chain)|
+|1  | [Generate a random number in a given range](#How-to-generate-a-random-number-in-a-given-range) |
+|2  | [Find the difference between two arrays](#How-to-find-the-difference-between-two-arrays)|
 
 
 **[⬆ Back to Top](#table-of-contents)**
@@ -31,8 +28,8 @@ const getRandomNumberInclusive =(min, max)=> {
 getRandomNumberInclusive(2, 10);
 ```
 
-# How to find the difference between two arrays.
-
+**[⬆ Back to Top](#table-of-contents)**
+### How to find the difference between two arrays
 
 ```javascript
 const firstArr = [5, 2, 1];

From 66f70e171c3e021cdc1f11fe01e27127093dd7a9 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Thu, 14 May 2020 14:55:53 +0300
Subject: [PATCH 29/62] update README

---
 README.md | 35 ++++++++++++++++++++++++++---------
 1 file changed, 26 insertions(+), 9 deletions(-)

diff --git a/README.md b/README.md
index 7bc0049..d395344 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,15 @@
 |---- | ---------
 |1  | [Generate a random number in a given range](#How-to-generate-a-random-number-in-a-given-range) |
 |2  | [Find the difference between two arrays](#How-to-find-the-difference-between-two-arrays)|
+|3  | [Convert truthy/falsy to boolean(true/false)](#Convert_truthy/falsy_to_boolean(true/false))|
+|4  | [Repeat a string](#Repeat_a_string)|
+|5  | [Check how long an operation takes](#Check_how_long_an_operation_takes)|
+|6  | [Two ways to remove an item in a specific in an array](#Two_ways_to_remove_an_item_in_a_specific_in_an_array)|
+|7  | [Did you know you can flat an array?](#Did_you_know_you_can_flat_an_array)|
+|8  | [Get unique values in an array](#Get_unique_values_in_an_array)|
+|9  | [Copy Text to Clipboard](#Copy_Text_to_Clipboard)|
+|10 | [Nested Destructuring](#Nested_Destructuring)|
+
 
 
 **[⬆ Back to Top](#table-of-contents)**
@@ -68,7 +77,8 @@ difference(firstArr, secondArr); //[3,4]
 console.log('difference',difference(firstArr, secondArr))
 ```
 
-# How to convert truthy/falsy to boolean(true/false)
+**[⬆ Back to Top](#table-of-contents)**
+### Convert truthy/falsy to boolean(true/false)
 ```javascript
 const myVar = null; 
 const mySecondVar = 1; 
@@ -80,8 +90,8 @@ console.log( !!myVar ) // false
 console.log( Boolean(mySecondVar) ) // true
 console.log( !!mySecondVar ) // true
 ```
-
-# How to repeat a string
+**[⬆ Back to Top](#table-of-contents)**
+### Repeat a string
 ```javascript
 
 let aliens = '';
@@ -99,7 +109,8 @@ Array(6).join('👽')
 //👽👽👽👽👽👽
 
 ```
-# Check how long an operation takes
+**[⬆ Back to Top](#table-of-contents)**
+### Check how long an operation takes
 ```javascript
 //The performance.now() method returns a DOMHighResTimeStamp, measured in milliseconds.
 //performance.now() is relative to page load and more precise in orders of magnitude. 
@@ -112,7 +123,8 @@ const endTime = performance.now();
 console.log("this doSomething took " + (endTime - startTime) + " milliseconds.");
 ```
 
-# Two ways to remove an item in a specific in an array
+**[⬆ Back to Top](#table-of-contents)**
+### Two ways to remove an item in a specific in an array
 
 ```javascript
 //Mutating way
@@ -126,7 +138,8 @@ const newArray = nonMuatatedArray.filter((item, index) => !( index === 2 ));
 console.log(newArray) //['a','b','d','e']
 ```
 
-# Did you know you can flat an array?
+**[⬆ Back to Top](#table-of-contents)**
+### Did you know you can flat an array
 
 ```javascript
 const myArray = [2, 3, [4, 5],[7,7, [8, 9, [1, 1]]]];
@@ -142,7 +155,8 @@ myArray.flat(infinity) // [2, 3, 4, 5 ,7,7, 8, 9, 1, 1];
 
 ```
 
-# Get unique values in an array
+**[⬆ Back to Top](#table-of-contents)**
+### Get unique values in an array
 
 ```javascript
 const numbers = [1,1,3,2,5,3,4,7,7,7,8];
@@ -164,7 +178,9 @@ const unieqNumbers4 = _.uniq(numbers)
 console.log(unieqNumbers4) //[1,3,2,5,4,7,8]
 
 ```
-# Copy Text to Clipboard
+
+**[⬆ Back to Top](#table-of-contents)**
+### Copy Text to Clipboard
 
 
 ```javascript
@@ -182,7 +198,8 @@ function copyToClipboard(){
 
 ```
 
-#  Nested Destructuring
+**[⬆ Back to Top](#table-of-contents)**
+###  Nested Destructuring
 
 
 ```javascript

From 8f43b466cb757a6e472f678f6a2947177c2a800f Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Thu, 14 May 2020 14:58:46 +0300
Subject: [PATCH 30/62] Update README.md

---
 README.md | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index d395344..6f24329 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@
 |---- | ---------
 |1  | [Generate a random number in a given range](#How-to-generate-a-random-number-in-a-given-range) |
 |2  | [Find the difference between two arrays](#How-to-find-the-difference-between-two-arrays)|
-|3  | [Convert truthy/falsy to boolean(true/false)](#Convert_truthy/falsy_to_boolean(true/false))|
+|3  | [Convert truthy/falsy to boolean(true/false)](#Convert_truthy_falsy_to_boolean)|
 |4  | [Repeat a string](#Repeat_a_string)|
 |5  | [Check how long an operation takes](#Check_how_long_an_operation_takes)|
 |6  | [Two ways to remove an item in a specific in an array](#Two_ways_to_remove_an_item_in_a_specific_in_an_array)|
@@ -78,7 +78,8 @@ console.log('difference',difference(firstArr, secondArr))
 ```
 
 **[⬆ Back to Top](#table-of-contents)**
-### Convert truthy/falsy to boolean(true/false)
+### Convert truthy falsy to boolean
+
 ```javascript
 const myVar = null; 
 const mySecondVar = 1; 

From 12441ac38b30a2f4caccea975dd75d3cbdce065f Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Thu, 14 May 2020 15:02:24 +0300
Subject: [PATCH 31/62] Update README.md

---
 README.md | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/README.md b/README.md
index 6f24329..59fe80e 100644
--- a/README.md
+++ b/README.md
@@ -1,19 +1,19 @@
 # JavaScript-snippets
-> Click :star:if you like the project. Pull Request are highly appreciated. Follow us [Facebook](https://www.facebook.com/snippetsJS) on Facebook.
+> Click :star:if you like the project. Pull Request are highly appreciated. Follow us on [Facebook](https://www.facebook.com/snippetsJS)
 
 ### Table of Contents
 | No. | Questions |
 |---- | ---------
 |1  | [Generate a random number in a given range](#How-to-generate-a-random-number-in-a-given-range) |
 |2  | [Find the difference between two arrays](#How-to-find-the-difference-between-two-arrays)|
-|3  | [Convert truthy/falsy to boolean(true/false)](#Convert_truthy_falsy_to_boolean)|
-|4  | [Repeat a string](#Repeat_a_string)|
-|5  | [Check how long an operation takes](#Check_how_long_an_operation_takes)|
-|6  | [Two ways to remove an item in a specific in an array](#Two_ways_to_remove_an_item_in_a_specific_in_an_array)|
-|7  | [Did you know you can flat an array?](#Did_you_know_you_can_flat_an_array)|
-|8  | [Get unique values in an array](#Get_unique_values_in_an_array)|
-|9  | [Copy Text to Clipboard](#Copy_Text_to_Clipboard)|
-|10 | [Nested Destructuring](#Nested_Destructuring)|
+|3  | [Convert truthy/falsy to boolean(true/false)](#Convert-truthy-falsy-to-boolean)|
+|4  | [Repeat a string](#Repeat-a-string)|
+|5  | [Check how long an operation takes](#Check-how-long-an-operation-takes)|
+|6  | [Two ways to remove an item in a specific in an array](#Two-ways-to-remove-an-item-in-a-specific-in-an-array)|
+|7  | [Did you know you can flat an array?](#Did-you-know-you-can-flat-an-array)|
+|8  | [Get unique values in an array](#Get-unique-values-in-an-array)|
+|9  | [Copy Text to Clipboard](#Copy-Text-to-Clipboard)|
+|10 | [Nested Destructuring](#Nested-Destructuring)|
 
 
 

From c9ed914d5b45989d3c45c74cb1eb30f92d5a1873 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Thu, 14 May 2020 15:26:57 +0300
Subject: [PATCH 32/62] Table of Contents

---
 README.md | 94 +++++++++++++++++++++++++++++++------------------------
 1 file changed, 53 insertions(+), 41 deletions(-)

diff --git a/README.md b/README.md
index 59fe80e..4051578 100644
--- a/README.md
+++ b/README.md
@@ -14,6 +14,24 @@
 |8  | [Get unique values in an array](#Get-unique-values-in-an-array)|
 |9  | [Copy Text to Clipboard](#Copy-Text-to-Clipboard)|
 |10 | [Nested Destructuring](#Nested-Destructuring)|
+|11 | [URLSearchParams](#URLSearchParams)|
+|12 | [Count elements in an array](#Count-elements-in-an-array)|
+|13 | [Aliases with JavaScript Destructuring](#Aliases-with-JavaScript-Destructuring)|
+|14 | [The Object.is() method determines whether two values are the same value](#The-Object.is()-method-determines-whether-two-values-are-the-same-value)|
+|15 | [Freeze an object](#Freeze-an-object)|
+|16 | [Printing Object keys and values](#Printing-Object-keys-and-values)|
+|17 | [Capture the right click event](#Capture-the-right-click-event)|
+|18 | [In HTML5, you can tell the browser when to run your JavaScript code](#In-HTML5,-you-can-tell-the-browser-when-to-run-your-JavaScript-code)|
+|19 | [Nullish coalescing operator](#Nullish-coalescing-operator)|
+|20 | [Optional chaining](#Optional-chaining)|
+|21 | [globalThis](#globalThis)|
+|22 | [The second argument of JSON.stringify lets you cherry-pick 🍒 keys to serialize.](#The-second-argument-of-JSON.stringify-lets-you-cherry-pick-🍒-keys-to-serialize)|
+|23 | [Fire an event listener only once.](#Fire-an-event-listener-only-once)|
+|24 | [Vanilla JS toggle](#Vanilla-JS-toggle)|
+|25 | [Check if a string is a valid JSON](#Check-if-a-string-is-a-valid-JSON)|
+|26 | [getBoundingClientRect](#getBoundingClientRect)|
+|27 | [Check if a node is in the viewport](#Check-if-a-node-is-in-the-viewport)|
+
 
 
 
@@ -217,7 +235,8 @@ const { education : { degree } } = user;
 console.log(degree) //Masters
 ```
 
-#  URLSearchParams 
+**[⬆ Back to Top](#table-of-contents)**
+###  URLSearchParams 
 
 
 ```javascript
@@ -232,22 +251,8 @@ console.log(urlParams.toString()); // "?post=1234&action=edit"
 console.log(urlParams.append('active', '1')); // "?post=1234&action=edit&active=1"
 ```
 
-
-#  Shuffle an array 
-
-
-```javascript
-const list = [1,2,3,4,5,6,7,8,9];
-const shuffle = list.sort(func);
-
-function func(a,b){
-  return 0.5 - Math.random();
-}
-
-console.log(shuffle);
-```
-
-#  Count elements in an array
+**[⬆ Back to Top](#table-of-contents)**
+###  Count elements in an array
 
 
 ```javascript
@@ -272,8 +277,8 @@ const countMyFruits = myFruits.reduce((countFruits,fruit) => {
  // { Apple:3, Banana:1, Mango:2, Orange:1 }
 ```
 
-
-#  Aliases with JavaScript Destructuring
+**[⬆ Back to Top](#table-of-contents)**
+###  Aliases with JavaScript Destructuring
 
 
 ```javascript
@@ -293,8 +298,8 @@ console.log(pageName) // JSsnippets
 ```
 
 
-
-#  The Object.is() method determines whether two values are the same value
+**[⬆ Back to Top](#table-of-contents)**
+###  The Object.is() method determines whether two values are the same value
 
 
 ```javascript
@@ -312,8 +317,8 @@ Object.is(foo, bar);         // false
 ```
 
 
-
-#  How can we freeze an object
+**[⬆ Back to Top](#table-of-contents)**
+###  Freeze an object
 
 
 ```javascript
@@ -342,8 +347,8 @@ Object.isFrozen(obj) //true
 
 ```
 
-
-#  Printing Object keys and values
+**[⬆ Back to Top](#table-of-contents)**
+###  Printing Object keys and values
 
 
 ```javascript
@@ -365,7 +370,9 @@ for(let [key,value] of Object.entries(obj)){
 // order is not guaranteed
 
 ```
-#  Capture the right click event
+
+**[⬆ Back to Top](#table-of-contents)**
+###  Capture the right click event
 
 ```javascript
 window.oncontextmenu = () => {
@@ -380,8 +387,8 @@ window.addEventListener('contextmenu', ()=>{
 },false)
 ```
 
-
-#  In HTML5, you can tell the browser when to run your JavaScript code
+**[⬆ Back to Top](#table-of-contents)**
+###  In HTML5, you can tell the browser when to run your JavaScript code
 ```javascript
 
 //Without async or defer, browser will run your script immediately, before rendering the elements that's below your script tag.
@@ -395,7 +402,8 @@ window.addEventListener('contextmenu', ()=>{
 <script defer src="myscript.js"></script>
 ```
 
-#   nullish coalescing operator
+**[⬆ Back to Top](#table-of-contents)**
+###   Nullish coalescing operator
 ```javascript
 
 // an equality check against nullary values (e.g. null or undefined). Whenever the expression to the left of the ?? operator evaluates to either //undefined or null, the value defined to the right will be returned.
@@ -410,7 +418,8 @@ console.log(age);
 // expected output: "0"
 ```
 
-#  Optional chaining
+**[⬆ Back to Top](#table-of-contents)**
+###  Optional chaining
 ```javascript
 
 const car = {}
@@ -433,7 +442,8 @@ console.log(newCarColor)
 //You can use this syntax today using @babel/plugin-proposal-optional-chaining
 ```
 
-#  globalThis
+**[⬆ Back to Top](#table-of-contents)**
+###  globalThis
 ```javascript
 Accessing the global property in JavaScript has always posed some difficulty. This is because 
 different platforms have different ways to access it.
@@ -451,7 +461,7 @@ console.log(globalThis) //get the global this depends on your environment
 ```
 
 
-
+**[⬆ Back to Top](#table-of-contents)**
 #  The second argument of JSON.stringify lets you cherry-pick 🍒 keys to serialize.
 ```javascript
 const user = {
@@ -478,8 +488,8 @@ returns
 
 ```
 
-
-#  Fire an event listener only once.
+**[⬆ Back to Top](#table-of-contents)**
+###  Fire an event listener only once
 ```javascript
 const el = document.getElementById("btn");
 
@@ -493,8 +503,8 @@ el.addEventListener('click', myClickHandler, {
 });
 
 ```
-
-#  Vanilla JS toggle
+**[⬆ Back to Top](#table-of-contents)**
+###  Vanilla JS toggle
 ```javascript
 const span = document.querySelector("span");
 let classes = span.classList;
@@ -510,7 +520,9 @@ span.addEventListener("click", function() {
 });
 
 ```
-# Check if a string is a valid JSON
+
+**[⬆ Back to Top](#table-of-contents)**
+### Check if a string is a valid JSON
 
 ```javascript
 function isJson(str) {
@@ -524,8 +536,8 @@ function isJson(str) {
     return true;									
 }
 ```
-
-# getBoundingClientRect
+**[⬆ Back to Top](#table-of-contents)**
+### getBoundingClientRect
 
 ```javascript
 //getBoundingClientRect provides you with important pieces of data about an
@@ -544,8 +556,8 @@ const bodyBounderies = document.body.getBoundingClientRect();
 //     }
 ```
 
-
-# Check if a node is in the viewport
+**[⬆ Back to Top](#table-of-contents)**
+### Check if a node is in the viewport
 bonus: add/remove animation depending if an image is in the viewport
 https://codepen.io/JSsnippets/pen/PoqrjEY
 ```javascript

From 3d13553eeb8376a1020dac94a93c9c0573b83b70 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Thu, 14 May 2020 15:29:14 +0300
Subject: [PATCH 33/62] Update README.md

---
 README.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index 4051578..979852b 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,7 @@
 |11 | [URLSearchParams](#URLSearchParams)|
 |12 | [Count elements in an array](#Count-elements-in-an-array)|
 |13 | [Aliases with JavaScript Destructuring](#Aliases-with-JavaScript-Destructuring)|
-|14 | [The Object.is() method determines whether two values are the same value](#The-Object.is()-method-determines-whether-two-values-are-the-same-value)|
+|14 | [The Object.is() method determines whether two values are the same value](#the-objectis-method-determines-whether-two-values-are-the-same-value)|
 |15 | [Freeze an object](#Freeze-an-object)|
 |16 | [Printing Object keys and values](#Printing-Object-keys-and-values)|
 |17 | [Capture the right click event](#Capture-the-right-click-event)|
@@ -25,7 +25,7 @@
 |19 | [Nullish coalescing operator](#Nullish-coalescing-operator)|
 |20 | [Optional chaining](#Optional-chaining)|
 |21 | [globalThis](#globalThis)|
-|22 | [The second argument of JSON.stringify lets you cherry-pick 🍒 keys to serialize.](#The-second-argument-of-JSON.stringify-lets-you-cherry-pick-🍒-keys-to-serialize)|
+|22 | [The second argument of JSON.stringify lets you cherry-pick 🍒 keys to serialize.](#the-second-argument-of-jsonstringify-lets-you-cherry-pick--keys-to-serialize)|
 |23 | [Fire an event listener only once.](#Fire-an-event-listener-only-once)|
 |24 | [Vanilla JS toggle](#Vanilla-JS-toggle)|
 |25 | [Check if a string is a valid JSON](#Check-if-a-string-is-a-valid-JSON)|

From e324a053bad1a82eb9e3ef2d29ee64bb00e721c8 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Thu, 14 May 2020 15:29:51 +0300
Subject: [PATCH 34/62] Update README.md

---
 README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 979852b..f9b8d45 100644
--- a/README.md
+++ b/README.md
@@ -21,7 +21,7 @@
 |15 | [Freeze an object](#Freeze-an-object)|
 |16 | [Printing Object keys and values](#Printing-Object-keys-and-values)|
 |17 | [Capture the right click event](#Capture-the-right-click-event)|
-|18 | [In HTML5, you can tell the browser when to run your JavaScript code](#In-HTML5,-you-can-tell-the-browser-when-to-run-your-JavaScript-code)|
+|18 | [In HTML5, you can tell the browser when to run your JavaScript code](#in-html5-you-can-tell-the-browser-when-to-run-your-javascript-code)|
 |19 | [Nullish coalescing operator](#Nullish-coalescing-operator)|
 |20 | [Optional chaining](#Optional-chaining)|
 |21 | [globalThis](#globalThis)|

From 32cabe1bab26687ae07250217891493a01942144 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Tue, 26 May 2020 11:35:48 +0300
Subject: [PATCH 35/62] Notify when element size is changed

---
 README.md | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/README.md b/README.md
index f9b8d45..1495a0b 100644
--- a/README.md
+++ b/README.md
@@ -31,6 +31,7 @@
 |25 | [Check if a string is a valid JSON](#Check-if-a-string-is-a-valid-JSON)|
 |26 | [getBoundingClientRect](#getBoundingClientRect)|
 |27 | [Check if a node is in the viewport](#Check-if-a-node-is-in-the-viewport)|
+|28 | [Notify when element size is changed](#Notify-when-element-size-is-changed)|
 
 
 
@@ -577,4 +578,21 @@ observer.observe(image);
 
 ```
 
+**[⬆ Back to Top](#table-of-contents)**
+### Notify when element size is changed 
+see our codepen: https://codepen.io/JSsnippets/pen/dyYoYVX
+```javascript
+const foo = document.getElementById("foo");
+
+const observer = new ResizeObserver((entries) => {
+  for (let entry of entries) {
+    const cr = entry.contentRect;
+    console.log = `Size: ${cr.width}px X ${cr.height}px`;
+  }
+});
+observer.observe(foo);
+
+
+```
+
 

From af8ebc291826eb0ee89c661870aa588342199e48 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Tue, 16 Jun 2020 09:42:21 +0300
Subject: [PATCH 36/62] Detect if Browser Tab is in the view

---
 README.md | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/README.md b/README.md
index 1495a0b..68b1108 100644
--- a/README.md
+++ b/README.md
@@ -32,6 +32,7 @@
 |26 | [getBoundingClientRect](#getBoundingClientRect)|
 |27 | [Check if a node is in the viewport](#Check-if-a-node-is-in-the-viewport)|
 |28 | [Notify when element size is changed](#Notify-when-element-size-is-changed)|
+|29 | [Detect if Browser Tab is in the view](#Detect-if-Browser-Tab-is-in-the-view)|
 
 
 
@@ -592,6 +593,23 @@ const observer = new ResizeObserver((entries) => {
 });
 observer.observe(foo);
 
+```
+**[⬆ Back to Top](#table-of-contents)**
+### Detect if Browser Tab is in the view
+play/pause video accordingly
+see our codepen: https://codepen.io/JSsnippets/pen/gOapPzq
+```javascript
+
+
+const video =  document.getElementById("my-video");
+
+const onVisibilitychange =()=>{
+   return document.hidden 
+     ? video.pause() 
+     : video.play();
+} 
+
+document.addEventListener("visibilitychange", onVisibilitychange)
 
 ```
 

From d593fc2c358d09048ee5f516eb7f4ff5fa7bd73b Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Wed, 24 Jun 2020 22:15:02 +0300
Subject: [PATCH 37/62] private class methods and fields

---
 README.md | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/README.md b/README.md
index 68b1108..756161a 100644
--- a/README.md
+++ b/README.md
@@ -33,6 +33,7 @@
 |27 | [Check if a node is in the viewport](#Check-if-a-node-is-in-the-viewport)|
 |28 | [Notify when element size is changed](#Notify-when-element-size-is-changed)|
 |29 | [Detect if Browser Tab is in the view](#Detect-if-Browser-Tab-is-in-the-view)|
+|30 | [Private class methods and fields](#Private-class-methods-and-fields)|
 
 
 
@@ -614,3 +615,33 @@ document.addEventListener("visibilitychange", onVisibilitychange)
 ```
 
 
+**[⬆ Back to Top](#table-of-contents)**
+### Private class methods and fields
+
+class Students {
+  #name;
+
+  constructor(){
+    this.#name = "JS snippets";
+  }
+
+  #privateMethod() {
+    return 'Come and learn Js with us';
+  }
+
+  getPrivateMessage() {
+      return this.#privateMethod();
+  }
+}
+
+const instance = new Something();
+console.log(instance.name); //=> undefined
+console.log(instance.privateMethod); //=> undefined
+console.log(instance.getPrivateMessage()); //=> Come and learn Js with us
+
+```
+
+
+
+
+

From 5d87a6595f68b858fe917c1506ac801d895c6449 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Wed, 24 Jun 2020 22:19:36 +0300
Subject: [PATCH 38/62] typo

---
 README.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/README.md b/README.md
index 756161a..e27c252 100644
--- a/README.md
+++ b/README.md
@@ -617,6 +617,7 @@ document.addEventListener("visibilitychange", onVisibilitychange)
 
 **[⬆ Back to Top](#table-of-contents)**
 ### Private class methods and fields
+```javascript
 
 class Students {
   #name;

From fb3caebea2141098ada57901ead4cc3182646ca9 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Thu, 16 Jul 2020 09:13:56 +0300
Subject: [PATCH 39/62] Preventing paste into an input field

---
 README.md | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index e27c252..3428dc4 100644
--- a/README.md
+++ b/README.md
@@ -34,7 +34,7 @@
 |28 | [Notify when element size is changed](#Notify-when-element-size-is-changed)|
 |29 | [Detect if Browser Tab is in the view](#Detect-if-Browser-Tab-is-in-the-view)|
 |30 | [Private class methods and fields](#Private-class-methods-and-fields)|
-
+|31 | [Preventing paste into an input field](#Preventing-paste-into-an-input-field)|
 
 
 
@@ -643,6 +643,20 @@ console.log(instance.getPrivateMessage()); //=> Come and learn Js with us
 ```
 
 
+**[⬆ Back to Top](#table-of-contents)**
+### Preventing paste into an input field
+see our codepen: https://codepen.io/JSsnippets/pen/qBbyMoJ
+
+```javascript
+
+const pasteBox = document.getElementById("paste-no-event");
+pasteBox.onpaste = (e) => {
+  e.preventDefault();
+  return false;
+};
+
+```
+
 
 
 

From a9bd1cd06bf8a60420cfac78893ff0d87c43844e Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Tue, 4 Aug 2020 11:07:33 +0300
Subject: [PATCH 40/62]  The void operator

---
 README.md | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/README.md b/README.md
index 3428dc4..79bb9eb 100644
--- a/README.md
+++ b/README.md
@@ -35,6 +35,7 @@
 |29 | [Detect if Browser Tab is in the view](#Detect-if-Browser-Tab-is-in-the-view)|
 |30 | [Private class methods and fields](#Private-class-methods-and-fields)|
 |31 | [Preventing paste into an input field](#Preventing-paste-into-an-input-field)|
+|32 | [The void operator](#The-void-operator)|
 
 
 
@@ -658,5 +659,19 @@ pasteBox.onpaste = (e) => {
 ```
 
 
+**[⬆ Back to Top](#table-of-contents)**
+### The void operator 
+The void operator evaluates the given expression and then returns undefined.
+```javascript
+
 
+void 0;  		//returns undefined
+void (0); 		//returns undefined
+void {}; 		//returns undefined
+void "JSsnippets; 	//returns undefined
+void (0); 		//returns undefined
+void (2 == '2'); 	//returns undefined
+void anyfunction(); 	//returns undefined
+
+```
 

From 6dafa8bd10cff371c5e562fef9347ec2a1c5aa03 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Thu, 27 Aug 2020 09:40:04 +0300
Subject: [PATCH 41/62] replaceAll

---
 README.md | 45 +++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 43 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index 79bb9eb..6dd261b 100644
--- a/README.md
+++ b/README.md
@@ -36,6 +36,7 @@
 |30 | [Private class methods and fields](#Private-class-methods-and-fields)|
 |31 | [Preventing paste into an input field](#Preventing-paste-into-an-input-field)|
 |32 | [The void operator](#The-void-operator)|
+|33 | [replaceAll](#replaceAll)|
 
 
 
@@ -660,8 +661,8 @@ pasteBox.onpaste = (e) => {
 
 
 **[⬆ Back to Top](#table-of-contents)**
-### The void operator 
-The void operator evaluates the given expression and then returns undefined.
+### replaceAll 
+the method string.replaceAll(search, replaceWith) replaces all appearances of search string with replaceWith.
 ```javascript
 
 
@@ -675,3 +676,43 @@ void anyfunction(); 	//returns undefined
 
 ```
 
+
+**[⬆ Back to Top](#table-of-contents)**
+### The void operator 
+The void operator evaluates the given expression and then returns undefined.
+```javascript
+
+
+const str = 'this is a JSsnippets example';
+
+const updatedStr = str.replace('example', 'snippet'); // 'this is a  JSsnippets snippet'
+
+
+The tricky part is that replace method replaces only the very first match of the substring we have passed:
+
+
+const str = 'this is a JSsnippets example and examples are great';
+
+const updatedStr = str.replace('example', 'snippet'); //'this is a JSsnippets snippet and examples are great'
+
+In order to go through this, we need to use a global regexp instead:
+
+
+const str = 'this is a JSsnippets example and examples are great';
+
+const updatedStr = str.replace(/example/g, 'snippet'); //'this is a JSsnippets snippet and snippets are greatr'
+
+but now we have new friend in town, replaceAll
+
+const str = 'this is a JSsnippets example and examples are great';
+
+const updatedStr = str.replaceAll('example', 'snippet'); //'this is a JSsnippets snippet and snippets are greatr'
+
+```
+
+
+
+
+
+
+

From 3ed5b5f93855cd64acbefcd555f0b65dc8634232 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Thu, 27 Aug 2020 09:41:00 +0300
Subject: [PATCH 42/62] replace all change

---
 README.md | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/README.md b/README.md
index 6dd261b..160449f 100644
--- a/README.md
+++ b/README.md
@@ -661,8 +661,8 @@ pasteBox.onpaste = (e) => {
 
 
 **[⬆ Back to Top](#table-of-contents)**
-### replaceAll 
-the method string.replaceAll(search, replaceWith) replaces all appearances of search string with replaceWith.
+### The void operator 
+The void operator evaluates the given expression and then returns undefined.
 ```javascript
 
 
@@ -678,8 +678,8 @@ void anyfunction(); 	//returns undefined
 
 
 **[⬆ Back to Top](#table-of-contents)**
-### The void operator 
-The void operator evaluates the given expression and then returns undefined.
+### replaceAll 
+the method string.replaceAll(search, replaceWith) replaces all appearances of search string with replaceWith.
 ```javascript
 
 

From 5b5e313d023337fbcd3ecb0f294aa10e80904889 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Wed, 9 Sep 2020 09:16:00 +0300
Subject: [PATCH 43/62] Required Function Params

---
 README.md | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 160449f..c63b3b9 100644
--- a/README.md
+++ b/README.md
@@ -37,7 +37,7 @@
 |31 | [Preventing paste into an input field](#Preventing-paste-into-an-input-field)|
 |32 | [The void operator](#The-void-operator)|
 |33 | [replaceAll](#replaceAll)|
-
+|34 | [Required Function Params](#Required-Function-Params)|
 
 
 **[⬆ Back to Top](#table-of-contents)**
@@ -711,6 +711,28 @@ const updatedStr = str.replaceAll('example', 'snippet'); //'this is a JSsnippets
 ```
 
 
+**[⬆ Back to Top](#table-of-contents)**
+### Required Function Params 
+Expanding on the default parameter technique, we can mark a parameter as mandatory
+
+```javascript
+const isRequired = () => {
+    throw new Error( 'This is a mandatory parameter.' );
+}
+
+
+const getPage = ( pageName = 'Jssnippets', url = isRequired() ) => {
+    return `${pageName} ${url}`;
+}
+
+console.log(getPage());
+
+//In the above code, url will be undefined and that will try to set the default value for it which is the isRequired() function. It will throw an error as,
+
+//Uncaught error: This is a mandatory parameter.
+//at isRequired
+
+```
 
 
 

From 48afc0ddd55ad4258b441977bea3d34cefe43173 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Wed, 23 Sep 2020 09:19:05 +0300
Subject: [PATCH 44/62] Get input value as a number

---
 README.md | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/README.md b/README.md
index c63b3b9..c417bad 100644
--- a/README.md
+++ b/README.md
@@ -38,6 +38,8 @@
 |32 | [The void operator](#The-void-operator)|
 |33 | [replaceAll](#replaceAll)|
 |34 | [Required Function Params](#Required-Function-Params)|
+|35 | [Get input value as a number](#Get-input-value-as-a-number)|
+
 
 
 **[⬆ Back to Top](#table-of-contents)**
@@ -737,4 +739,18 @@ console.log(getPage());
 
 
 
+**[⬆ Back to Top](#table-of-contents)**
+### Get input value as a number
+
+```javascript
+
+<input type="number" id="JSsnippets" onkeyup="checkMyType(event)" />
+
+function checkMyType(event){
+  
+  console.log(typeof event.target.value) // string
+  console.log(typeof event.target.valueAsNumber ) // number
+
+}
 
+```

From bae6599b2aeabca1736a47cf3f13d7b69b8b84f4 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Tue, 6 Oct 2020 10:39:29 +0300
Subject: [PATCH 45/62] reduceRight

---
 README.md | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index c417bad..aa8bc05 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,5 @@
 # JavaScript-snippets
-> Click :star:if you like the project. Pull Request are highly appreciated. Follow us on [Facebook](https://www.facebook.com/snippetsJS)
+> Click :star: if you like the project. Pull Request are highly appreciated. Follow us on [Facebook](https://www.facebook.com/snippetsJS)
 
 ### Table of Contents
 | No. | Questions |
@@ -39,6 +39,7 @@
 |33 | [replaceAll](#replaceAll)|
 |34 | [Required Function Params](#Required-Function-Params)|
 |35 | [Get input value as a number](#Get-input-value-as-a-number)|
+|36 | [reduceRight](#reduceRight)|
 
 
 
@@ -753,4 +754,24 @@ function checkMyType(event){
 
 }
 
+
+```
+**[⬆ Back to Top](#table-of-contents)**
+### reduceRight
+
+```javascript
+
+const arr = ["a", "b", "c", "d", "e"]
+
+const reduceArray = arr.reduce((acc, current) => {
+    return acc + current
+}, "")
+//return abcde
+
+const reduceRightArray = arr.reduceRight((acc, current) => {
+    return acc + current
+}, "")
+//return edcba
+
 ```
+

From f3233ab7ddbcc58a10638b0902cf8982e5265e70 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Tue, 27 Oct 2020 10:48:19 +0200
Subject: [PATCH 46/62] Abort Fetch

---
 README.md | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/README.md b/README.md
index aa8bc05..88f2009 100644
--- a/README.md
+++ b/README.md
@@ -40,6 +40,10 @@
 |34 | [Required Function Params](#Required-Function-Params)|
 |35 | [Get input value as a number](#Get-input-value-as-a-number)|
 |36 | [reduceRight](#reduceRight)|
+|37 | [Abort Fetch](#AbortFetch)|
+
+
+
 
 
 
@@ -775,3 +779,34 @@ const reduceRightArray = arr.reduceRight((acc, current) => {
 
 ```
 
+
+
+```
+**[⬆ Back to Top](#table-of-contents)**
+### Abort Fetch
+
+```javascript
+
+
+//HTML
+<button id="download">Download</button>
+<button id="abort">Abort</button>
+
+//JS
+let controller;
+
+document.querySelector('#download').addEventListener('click', () => {
+  controller = new AbortController();
+  const signal = controller.signal;
+  fetch('https://cdn.plyr.io/static/demo/View_From_A_Blue_Moon_Trailer-576p.mp4', {signal})
+    .then(() => console.log('done'));
+});
+
+document.querySelector('#abort').addEventListener('click', function() {
+  controller.abort();
+});
+
+```
+
+
+

From aecd69b70fc4238b347560a46158246161d60fc0 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Tue, 27 Oct 2020 10:49:08 +0200
Subject: [PATCH 47/62] typo

---
 README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 88f2009..c972f2b 100644
--- a/README.md
+++ b/README.md
@@ -40,7 +40,7 @@
 |34 | [Required Function Params](#Required-Function-Params)|
 |35 | [Get input value as a number](#Get-input-value-as-a-number)|
 |36 | [reduceRight](#reduceRight)|
-|37 | [Abort Fetch](#AbortFetch)|
+|37 | [Abort Fetch](#Abort-Fetch)|
 
 
 

From 1448ea5fab602b00a68356c25c67d43bfdab40e9 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Tue, 27 Oct 2020 10:49:47 +0200
Subject: [PATCH 48/62] Update README.md

---
 README.md | 2 --
 1 file changed, 2 deletions(-)

diff --git a/README.md b/README.md
index c972f2b..fde7f3e 100644
--- a/README.md
+++ b/README.md
@@ -780,8 +780,6 @@ const reduceRightArray = arr.reduceRight((acc, current) => {
 ```
 
 
-
-```
 **[⬆ Back to Top](#table-of-contents)**
 ### Abort Fetch
 

From 7ec664906abbeb164d9c3b3db7d0ade523eaa3c9 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Tue, 10 Nov 2020 09:47:24 +0200
Subject: [PATCH 49/62] change object value which is inside an array

---
 README.md | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/README.md b/README.md
index fde7f3e..97ef1e7 100644
--- a/README.md
+++ b/README.md
@@ -41,6 +41,10 @@
 |35 | [Get input value as a number](#Get-input-value-as-a-number)|
 |36 | [reduceRight](#reduceRight)|
 |37 | [Abort Fetch](#Abort-Fetch)|
+|38 | [How to change the value of an object which is inside an array](#How-to-change-the-value-of-an-object-which-is-inside-an-array)|
+
+
+
 
 
 
@@ -807,4 +811,38 @@ document.querySelector('#abort').addEventListener('click', function() {
 ```
 
 
+**[⬆ Back to Top](#table-of-contents)**
+### How to change the value of an object which is inside an array
+
+```javascript
+
+const state = [
+  {
+    userId: 1,
+    name: "JSSnippets",
+    isOwner: false,
+  },
+  {
+    userId: 2,
+    name: "React",
+    isOwner: false,
+  },
+  {
+    userId: 3,
+    name: "Vue",
+    isOwner: false,
+  },
+  {
+    userId: 4,
+    name: "Angular",
+    isOwner: false,
+  },
+];
+
+const newState = state.map((obj) =>
+  obj.name === "JSSnippets" ? { ...obj, isOwner: true } : obj			
+);
+
+```
+
 

From 45748db3131538e7713b5a3727c5053c86763010 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Tue, 19 Jan 2021 22:59:05 +0200
Subject: [PATCH 50/62] Numeric separators

---
 README.md | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/README.md b/README.md
index 97ef1e7..b499b95 100644
--- a/README.md
+++ b/README.md
@@ -42,6 +42,8 @@
 |36 | [reduceRight](#reduceRight)|
 |37 | [Abort Fetch](#Abort-Fetch)|
 |38 | [How to change the value of an object which is inside an array](#How-to-change-the-value-of-an-object-which-is-inside-an-array)|
+|39 | [Numeric separators allow us to improve our code readability](#Numeric-separators-allow-us-to-improve-our-code-readability)|
+
 
 
 
@@ -845,4 +847,18 @@ const newState = state.map((obj) =>
 
 ```
 
+**[⬆ Back to Top](#table-of-contents)**
+### Numeric separators allow us to improve our code readability
+
+```javascript
+
+100_000_000 === 100000000 // true
+
+300_000 === 300000 //true
+
+```
+
+
+
+
 

From 4f0ef948188271fa35e8e31dc306ba5ac51ab373 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Wed, 27 Jan 2021 08:45:24 +0200
Subject: [PATCH 51/62] pay attention when using every

---
 README.md | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/README.md b/README.md
index b499b95..d0b6b03 100644
--- a/README.md
+++ b/README.md
@@ -862,3 +862,24 @@ const newState = state.map((obj) =>
 
 
 
+**[⬆ Back to Top](#table-of-contents)**
+### pay attention when using every
+
+Calling this method on an empty array will return true for any condition!
+
+
+```javascript
+
+const arr = []
+const result = arr.every(x=> x==5)
+console.log(result) //true
+
+```
+
+
+
+
+
+
+
+

From 76efd6bce3f93c969c9cc18234b0f3b2a53cab80 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Wed, 27 Jan 2021 08:46:46 +0200
Subject: [PATCH 52/62] add title

---
 README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/README.md b/README.md
index d0b6b03..9ace570 100644
--- a/README.md
+++ b/README.md
@@ -43,7 +43,7 @@
 |37 | [Abort Fetch](#Abort-Fetch)|
 |38 | [How to change the value of an object which is inside an array](#How-to-change-the-value-of-an-object-which-is-inside-an-array)|
 |39 | [Numeric separators allow us to improve our code readability](#Numeric-separators-allow-us-to-improve-our-code-readability)|
-
+|40 | [pay attention when using every](#pay-attention-when-using-every)|
 
 
 

From aab98f5484371a1e2d37613aacddbcb88e7bc009 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Mon, 22 Mar 2021 13:40:35 +0200
Subject: [PATCH 53/62] convert an array of key-value into an object

---
 README.md | 25 +++++++++++++++++++++++--
 1 file changed, 23 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index 9ace570..fb62f64 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,5 @@
 # JavaScript-snippets
-> Click :star: if you like the project. Pull Request are highly appreciated. Follow us on [Facebook](https://www.facebook.com/snippetsJS)
+> Click :star:  if you like the project. Pull Request are highly appreciated. Follow us on [Facebook](https://www.facebook.com/snippetsJS)
 
 ### Table of Contents
 | No. | Questions |
@@ -44,7 +44,7 @@
 |38 | [How to change the value of an object which is inside an array](#How-to-change-the-value-of-an-object-which-is-inside-an-array)|
 |39 | [Numeric separators allow us to improve our code readability](#Numeric-separators-allow-us-to-improve-our-code-readability)|
 |40 | [pay attention when using every](#pay-attention-when-using-every)|
-
+|41 | [How to convert an array of key-value tuples into an object](#How-to-convert-an-array-of-key-value-tuples-into-an-object)|
 
 
 
@@ -880,6 +880,27 @@ console.log(result) //true
 
 
 
+**[⬆ Back to Top](#table-of-contents)**
+### How to convert an array of key-value tuples into an object
+
+
+```javascript
 
+const JSarr = [
+    ['name', 'JSsnippets'],
+    ['address', 'worldwide'],
+    ['year', '2018'],
+    ['followers', '15000']
+
+];
+
+const obj = Object.fromEntries(JSarr);
+//{
+//  "name": "JSsnippets",
+// "address": "worldwide",
+//  "year": "2018",
+//  "followers": "15000"
+//}
+```
 
 

From d9fb76816b1d4291bf109707bb2d9f77dbb84bd0 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Wed, 14 Apr 2021 07:51:32 +0300
Subject: [PATCH 54/62] Native text to speech JS

---
 README.md | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index fb62f64..f08592d 100644
--- a/README.md
+++ b/README.md
@@ -45,7 +45,7 @@
 |39 | [Numeric separators allow us to improve our code readability](#Numeric-separators-allow-us-to-improve-our-code-readability)|
 |40 | [pay attention when using every](#pay-attention-when-using-every)|
 |41 | [How to convert an array of key-value tuples into an object](#How-to-convert-an-array-of-key-value-tuples-into-an-object)|
-
+|42 | [Native text to speech JS](#Native-text-to-speech-JS)|
 
 
 
@@ -903,4 +903,25 @@ const obj = Object.fromEntries(JSarr);
 //}
 ```
 
+**[⬆ Back to Top](#table-of-contents)**
+### Native text to speech JS
+
+
+```javascript
+
+const startSpeaking=()=>{
 
+	let msg = document.getElementById("text-to-speech").value;
+	let speech = new SpeechSynthesisUtterance();
+	
+	speech.lang = "en-US";
+	speech.text = msg;
+	speech.volume = 1;
+	speech.rate = 1;
+	speech.pitch = 1;
+
+	window.speechSynthesis.speak(speech);
+}
+
+
+```

From 795fb29021bee1c79cf2b5572380c2d457dabef2 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Tue, 5 Oct 2021 12:09:37 +0300
Subject: [PATCH 55/62] toFixed

---
 README.md | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index f08592d..9d8ef32 100644
--- a/README.md
+++ b/README.md
@@ -46,8 +46,7 @@
 |40 | [pay attention when using every](#pay-attention-when-using-every)|
 |41 | [How to convert an array of key-value tuples into an object](#How-to-convert-an-array-of-key-value-tuples-into-an-object)|
 |42 | [Native text to speech JS](#Native-text-to-speech-JS)|
-
-
+|42 | [Native text to speech JS](#Native-text-to-speech-JS)|
 
 
 
@@ -924,4 +923,19 @@ const startSpeaking=()=>{
 }
 
 
+```
+
+**[⬆ Back to Top](#table-of-contents)**
+### toFixed()
+
+Warning: Floating point numbers cannot represent all decimals precisely in binary. This can lead to unexpected results, such as 0.1 + 0.2 === 0.3 returning false .
+
+```javascript
+
+123.678.toFixed()       // Returns '124'
+123.678.toFixed(1)      // Returns '123.7': Note rounding
+
+2.35.toFixed(1)        // Returns '2.4'. Note it rounds up
+2.65.toFixed(1)        // Returns '2.6'. Note it rounds down -why??? see the warning above
+
 ```

From d0d13903cfbc7ccf504a0458a1b0438c510db287 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Tue, 5 Oct 2021 12:10:21 +0300
Subject: [PATCH 56/62] toFixed-table-of-content

---
 README.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index 9d8ef32..f419b8a 100644
--- a/README.md
+++ b/README.md
@@ -46,7 +46,7 @@
 |40 | [pay attention when using every](#pay-attention-when-using-every)|
 |41 | [How to convert an array of key-value tuples into an object](#How-to-convert-an-array-of-key-value-tuples-into-an-object)|
 |42 | [Native text to speech JS](#Native-text-to-speech-JS)|
-|42 | [Native text to speech JS](#Native-text-to-speech-JS)|
+|42 | [toFixed](#toFixed)|
 
 
 
@@ -926,7 +926,7 @@ const startSpeaking=()=>{
 ```
 
 **[⬆ Back to Top](#table-of-contents)**
-### toFixed()
+### toFixed
 
 Warning: Floating point numbers cannot represent all decimals precisely in binary. This can lead to unexpected results, such as 0.1 + 0.2 === 0.3 returning false .
 

From 0f3bfaada86bf5de913ca31a71392a095251dcf3 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Tue, 5 Oct 2021 12:10:45 +0300
Subject: [PATCH 57/62] line number

---
 README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/README.md b/README.md
index f419b8a..bdfb40b 100644
--- a/README.md
+++ b/README.md
@@ -46,7 +46,7 @@
 |40 | [pay attention when using every](#pay-attention-when-using-every)|
 |41 | [How to convert an array of key-value tuples into an object](#How-to-convert-an-array-of-key-value-tuples-into-an-object)|
 |42 | [Native text to speech JS](#Native-text-to-speech-JS)|
-|42 | [toFixed](#toFixed)|
+|43 | [toFixed](#toFixed)|
 
 
 

From 582356cbe3d5a14e7c33d71f4743ff7bd45fdcd9 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Tue, 15 Mar 2022 09:46:20 +0200
Subject: [PATCH 58/62] randomUUID

---
 README.md | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/README.md b/README.md
index bdfb40b..de6bad4 100644
--- a/README.md
+++ b/README.md
@@ -47,6 +47,10 @@
 |41 | [How to convert an array of key-value tuples into an object](#How-to-convert-an-array-of-key-value-tuples-into-an-object)|
 |42 | [Native text to speech JS](#Native-text-to-speech-JS)|
 |43 | [toFixed](#toFixed)|
+|44 | [generate randomUUID](#generate-random-uuid)|
+
+
+
 
 
 
@@ -939,3 +943,18 @@ Warning: Floating point numbers cannot represent all decimals precisely in binar
 2.65.toFixed(1)        // Returns '2.6'. Note it rounds down -why??? see the warning above
 
 ```
+
+
+**[⬆ Back to Top](#table-of-contents)**
+### generate random uuid
+
+The randomUUID() method of the Crypto interface is used to generate a v4 UUID using a cryptographically secure random number generator.
+
+```javascript
+
+crypto.randomUUID() // print in console '460ff1e6-2106-4848-833d-5c5b3bfdc943'
+
+crypto.randomUUID() // print in console '9a91c014-d1b1-453a-8091-ef8b9b48b14a'
+
+
+```

From b34f9d143865d82b9fba9a94bcc3f3b81b568cc2 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Wed, 3 Aug 2022 11:25:15 +0300
Subject: [PATCH 59/62] structuredClone

---
 README.md | 30 +++++++++++++++++++++++++++---
 1 file changed, 27 insertions(+), 3 deletions(-)

diff --git a/README.md b/README.md
index de6bad4..cf3f505 100644
--- a/README.md
+++ b/README.md
@@ -48,9 +48,7 @@
 |42 | [Native text to speech JS](#Native-text-to-speech-JS)|
 |43 | [toFixed](#toFixed)|
 |44 | [generate randomUUID](#generate-random-uuid)|
-
-
-
+|45 | [structuredClone](#structuredClone)|
 
 
 
@@ -957,4 +955,30 @@ crypto.randomUUID() // print in console '460ff1e6-2106-4848-833d-5c5b3bfdc943'
 crypto.randomUUID() // print in console '9a91c014-d1b1-453a-8091-ef8b9b48b14a'
 
 
+```
+
+
+**[⬆ Back to Top](#table-of-contents)**
+### structuredClone
+
+If you want to deep clone a value in Node.js, you no longer need to use a library or the JSON.parse(JSON.stringify(value)) hack. You can use the new global function structuredClone()
+
+```javascript
+
+const user = {
+  name: "JS Snippets",
+  address: { street: "Original Road", city: "Placeshire" },
+};
+
+const clonedUser = structuredClone(user);
+
+clonedUser.address.street = "New Road";
+
+console.log("user.address.street:", user.address.street);
+// > Original Road
+
+console.log("clonedUser.address.street:", clonedUser.address.street);
+// > New Road
+
+
 ```

From b2d0d5e7cef104535d7d087dd4a0ba2c1105a5b5 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Mon, 30 Jan 2023 16:23:25 +0200
Subject: [PATCH 60/62] get device orientation

get device orientation
---
 README.md | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/README.md b/README.md
index cf3f505..3046c8b 100644
--- a/README.md
+++ b/README.md
@@ -49,9 +49,7 @@
 |43 | [toFixed](#toFixed)|
 |44 | [generate randomUUID](#generate-random-uuid)|
 |45 | [structuredClone](#structuredClone)|
-
-
-
+|46 | [get device orientation](#get-device-orientation)|
 
 
 **[⬆ Back to Top](#table-of-contents)**
@@ -981,4 +979,18 @@ console.log("clonedUser.address.street:", clonedUser.address.street);
 // > New Road
 
 
+```
+
+**[⬆ Back to Top](#table-of-contents)**
+### get device orientation
+
+Browsers expose a global variable named screen, which we’ll use to access the information we need.
+
+```javascript
+
+function getOrientation() {  
+    const isPortrait = screen.orientation.type.startswith('portrait')  
+    return isPortrait ? 'portrait' : 'landscape'
+}
+
 ```

From 8f85e7133d4c0c7563a6afe2b5541a79c2bc92c2 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Wed, 8 Feb 2023 11:40:56 +0200
Subject: [PATCH 61/62] CONST vs LET vs VAR

---
 README.md | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 3046c8b..da616aa 100644
--- a/README.md
+++ b/README.md
@@ -50,7 +50,7 @@
 |44 | [generate randomUUID](#generate-random-uuid)|
 |45 | [structuredClone](#structuredClone)|
 |46 | [get device orientation](#get-device-orientation)|
-
+|47 | [CONST vs LET vs VAR](#const-let-var)|
 
 **[⬆ Back to Top](#table-of-contents)**
 ### How to generate a random number in a given range
@@ -994,3 +994,14 @@ function getOrientation() {
 }
 
 ```
+
+**[⬆ Back to Top](#table-of-contents)**
+### CONST vs LET vs VAR
+
+|                        | const | Let | Var |
+|------------------------|-------|-----|-----|
+| Can be Reaasigned?     | X     | :white_check_mark:   | V   |
+| Cab be Redeclared?     | X     | X   | V   |
+| Block Scope            | V     | V   | X   |
+| Function Scope         | V     | V   | V   |
+| Stored in Global Scope | X     | X   | V   |

From 23fe606caaa26c9ffde116274b56afdd9455bc72 Mon Sep 17 00:00:00 2001
From: roeib <berkovichroei@gmail.com>
Date: Wed, 8 Feb 2023 11:43:49 +0200
Subject: [PATCH 62/62] Update README.md

---
 README.md | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/README.md b/README.md
index da616aa..dcd01f3 100644
--- a/README.md
+++ b/README.md
@@ -1000,8 +1000,8 @@ function getOrientation() {
 
 |                        | const | Let | Var |
 |------------------------|-------|-----|-----|
-| Can be Reaasigned?     | X     | :white_check_mark:   | V   |
-| Cab be Redeclared?     | X     | X   | V   |
-| Block Scope            | V     | V   | X   |
-| Function Scope         | V     | V   | V   |
-| Stored in Global Scope | X     | X   | V   |
+| Can be Reaasigned?     | :x:     | :white_check_mark:   |:white_check_mark:   |
+| Cab be Redeclared?     | :x:    | :x:  | :white_check_mark:  |
+| Block Scope            | :white_check_mark:    |:white_check_mark:   | :x:   |
+| Function Scope         | :white_check_mark:     | :white_check_mark:   | :white_check_mark:   |
+| Stored in Global Scope | :x:     | :x:   | :white_check_mark:   |