typecoercion

Author: nilajcoder

Variables/typecoercion.js

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+
+// Arithemetic
+console.log(1 + 1)//2
+console.log(1 - 1)//0
+console.log(5 * 2)//10
+console.log(4 / 2)//2
+console.log(5 ** 2)//25
+
+
+//String +  - * /  Number/String
+console.log("5" + 2)//52//string
+console.log(1 + "2") //12 string
+console.log("1" + "2")//12 string
+console.log("str" + "hii")//strhii
+console.log("str" + 5)//str5 string
+
+console.log("5" - 2)//3//number
+console.log(1 - "2") //-1 number
+console.log("1" - "2")//-1 number
+console.log("str" - "hii")//NAN
+console.log("str" - 5)//NAN
+console.log(5 - "g")// NAN
+
+
+
+console.log("5" * 2)//10//number
+console.log(1 * "2") //2 number
+console.log("1" * "2")//2 number
+console.log("str" * "hii")//NAN
+console.log("str" * 5)//NAN
+console.log(5 * "g")// NAN
+
+
+console.log("5" / 2)//2.5//number
+console.log(1 / "2") //0.5 number
+console.log("1" / "2")//0.5 number
+console.log("str" / "hii")//NAN
+console.log("str" / 5)//NAN
+console.log(5 / "g")// NAN
+
+
+
+// Boolean
+
+console.log(1 == true);   // true   (true → 1)
+console.log(0 == false);  // true   (false → 0)
+console.log(2 == true);   // false  (true → 1, 2 != 1)
+
+
+// Null Undefined
+
+console.log(null == undefined); // true (loose equality special case)
+console.log(null === undefined); // false (different types)
+
+
+// IF Else 
+if ("") {
+    console.log("yes");
+}
+else {
+    console.log("no");
+}
+// "no"  (empty string is falsy)
+
+
+if ("0"){
+
+    console.log("yes");
+}
+else {
+    console.log("no");
+}
+// "yes" (string "0" is truthy)
+
+
+if ([]){
+    console.log("yes");
+}
+else {
+    console.log("no");
+}
+//[] empty array truthy value yes
+
+
+if ({}){
+    console.log("yes");
+}
+else {
+    console.log("no");
+}  //{} truthy value yes
+
+
+if (1){
+    console.log("yes");
+}
+else {
+    console.log("no");
+} //1 trure yes
+
+
+if (0){
+    console.log("yes");
+}
+else {
+    console.log("no");
+}  //0 false no
+
+if (" "){
+    console.log("yes");
+}
+else {
+    console.log("no");
+} // " " with space truthy value yes
+
+
+if (""){
+    console.log("yes");
+}
+else {
+    console.log("no");
+} // no  "" empty string false no
+
+
+if (-5){
+    console.log("yes");
+}
+else {
+    console.log("no");
+} // yes   
+
+
+//Equality Pitfalls
+console.log("0" == 0);   // true  ("0" → number 0)
+console.log(false == "0"); // true (false → 0, "0" → 0)
+console.log([] == "");   // true  ([] → "" → number 0, "" → 0)
+console.log([] == 0);    // true  ([] → "" → 0)
+console.log([1] == 1);   // true  ([1] → "1" → 1)
+
+
+