added: find.index find object.matching reverse sort #1

Author: yussan

find.index.js

@@ -0,0 +1,11 @@
+const animals = [
+    { name: 'Waffles', type: 'dog', age: 12 },
+    { name: 'Fluffy', type: 'cat', age: 14 },
+    { name: 'Spelunky', type: 'dog', age: 4 },
+    { name: 'Hank', type: 'dog', age: 11 } 
+  ];
+
+  // get index data dog by name 'waffles'
+  const index = animals.findIndex(n => n.name.toLowerCase() == 'waffles');
+
+  console.log(index);

find.js

@@ -0,0 +1,11 @@
+const animals = [
+    { name: 'Waffles', type: 'dog', age: 12 },
+    { name: 'Fluffy', type: 'cat', age: 14 },
+    { name: 'Spelunky', type: 'dog', age: 4 },
+    { name: 'Hank', type: 'dog', age: 11 } 
+  ];
+
+  // get all data dog by name 'waffles'
+  const data = animals.find(n => n.name.toLowerCase() == 'waffles');
+
+  console.log(data);

object.matching.js

@@ -0,0 +1,16 @@
+const animals = [
+    { name: 'Waffles', type: 'dog', age: 12 },
+    { name: 'Fluffy', type: 'cat', age: 14 },
+    { name: 'Spelunky', type: 'dog', age: 4 },
+    { name: 'Hank', type: 'dog', age: 11 } 
+  ];
+
+/**
+ * get first data of array 
+ * its same as   
+ * const name = animals[0].name
+ * const type = animals[0].type
+ * const age = animals[0].age
+ */
+const {name, type, age} = animals[0];
+console.log(name, type, age);  

reverse.js

@@ -0,0 +1,12 @@
+const animals = [
+    { name: 'Waffles', type: 'dog', age: 12 },
+    { name: 'Fluffy', type: 'cat', age: 14 },
+    { name: 'Spelunky', type: 'dog', age: 4 },
+    { name: 'Hank', type: 'dog', age: 11 } 
+  ];
+ 
+ /**
+  * result must be
+  * 1)Hank 2)Spelunky 3)Fluffy 4) Waffles
+  */ 
+ console.log(animals.reverse())

sort.js

@@ -0,0 +1,22 @@
+const animals = [
+  { name: 'Waffles', type: 'dog', age: 12 },
+  { name: 'Fluffy', type: 'cat', age: 14 },
+  { name: 'Spelunky', type: 'dog', age: 4 },
+  { name: 'Hank', type: 'dog', age: 11 } 
+];
+
+// sort to a -> z
+const sortres = animals.sort((a, b) => {
+const nameA = a.name.toLowerCase();//ignore uper/lowercase
+const nameB = b.name.toLowerCase();//ignore uper/lowercase
+if (nameA < nameB) {
+  return -1;
+}
+if (nameA > nameB) {
+  return 1;
+}
+// names must be equal
+return 0;
+})
+
+console.log(sortres)