update: files

Author: isinghabhishek

JavaScript Part-01/71CallApplyBindMethods.js

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+//  call  apply  bind
+
+function hello() {
+    console.log("hello world");
+}
+// normally calling a function
+hello(); // o/p --> hello world
+// both will same output
+// using .call() function --> we can call a function
+hello.call(); // o/p --> hello world
+
+// ex
+const user = {
+    firstName : "Abhishek",
+    age : 21,
+    about: function(){
+        console.log(this.firstName, this.age)
+    }
+}
+user.about(); // o/p --> Abhishek 21
+
+
+// explaining call() function
+function about(hobby, favMusician){
+    console.log(this.firstName, this.age, hobby, favMusician);
+}
+const user1 = {
+    firstName: "abhishek",
+    age: 18,
+}
+const user2 = {
+    firstName: "Prthivi",
+    age: 16,
+}
+// hume user2 keliye about() use karna hai
+// these can be possible with the help of call() function
+about.call(user2); // o/p--> Prthivi 16 undefined undefined
+// user2 ko borrow karna hai user1 se about().
+about.call(user1, "guitar", "moazrt"); 
+// o/p --> abhishek 18 guitar moazrt
+// in call we have pass it as a String
+
+
+//   apply
+// in appiy we pass in arguments in form of array
+about.apply(user1, ["Drum", "bach"]); 
+// o/p --> abhishek 18 Drum bach
+
+// bind
+// bind() return function which can be stored and called
+const func = about.bind(user2, "instuments", "jagjitJi"); 
+// o/p --> Prthivi 16 instuments jagjitJi
+func();
+

JavaScript Part-01/72SmallWarning.js

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+//  
+
+const user1 = {
+    firstName: "Abhishek",
+    age: 18,
+    about: function(){
+        console.log(this.firstName, this.age);
+    }
+}
+
+//  don't  do this  mistakes
+// these not right way here we call we need to bind
+const myFunc = user1.about;
+
+// user1.about();
+
+//const myFunc = user1.about.bind(user1);
+myFunc();

JavaScript Part-01/73ArrowFunction&This.js

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+//  arrow function
+
+// arrow function me this nahi hotha
+// arrow function ka "this" jo hota usho oh apne surrounding's se letha hai
+// 'this' lega ek level up yani ke 'window' hoga es case me
+
+const user1 = {
+    firstName: "Abhishek",
+    age: 18,
+    about: () => {
+        console.log(this.firstName, this.age);
+    }
+}
+// user1 will not be "this" for arrow function
+// this ek level up-hogaa matlb--> "window" hogaa
+user1.about(); // op--> undefined undefined
+
+

JavaScript Part-01/74ShortSyntax.js

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+//   short syntax
+
+// const user = {
+//     firstName: "Abhishek",
+//     age: 18,
+//     about: function(){
+//         console.log(this.firstName, this.age);
+//     }
+// }
+
+// object ke andar jo function hote hai unko methods kah te hai
+
+//  both above and below codes are same
+const user1 = {
+    firstName: "Abhishek",
+    age: 18,
+    about(){
+        console.log(this.firstName, this.age);
+    }
+}
+user1.about();