Arrows in javascript

Author: kanaklatwal

03_basics/03_Arrows.js

@@ -0,0 +1,79 @@
+const user = {
+    username: "kalpjeet",
+    price: 999,
+    welcomeMessage: function(){
+        console.log(`${this.username} , welcome to website`);
+        console.log(this);//
+//         kalpjeet , welcome to website
+//           {
+//               username: 'kalpjeet',
+//               price: 999,
+//               welcomeMessage: [Function: welcomeMessage]
+//           }
+//          sam , welcome to website
+//            {
+//                username: 'sam',
+//                 price: 999,
+//                 welcomeMessage: [Function: welcomeMessage]
+//                }
+    }
+}
+user.welcomeMessage()//kalpjeet , welcome to website
+user.username = "sam"
+user.welcomeMessage()//sam , welcome to website
+console.log(this);//{}
+
+function chai(){
+    let username ="kalpjeet"
+    console.log(this);
+    //console.log(this.username) //undefined
+}
+chai()
+/* <ref *1> Object [global] {
+  global: [Circular *1],
+  clearImmediate: [Function: clearImmediate],
+  setImmediate: [Function: setImmediate] {
+    Symbol(nodejs.util.promisify.custom): [Getter]
+  },
+  clearInterval: [Function: clearInterval],
+  clearTimeout: [Function: clearTimeout],
+  setInterval: [Function: setInterval],
+  setTimeout: [Function: setTimeout] {
+    Symbol(nodejs.util.promisify.custom): [Getter]
+  },
+  queueMicrotask: [Function: queueMicrotask],
+  structuredClone: [Function: structuredClone],
+  atob: [Function: atob],
+  btoa: [Function: btoa],
+  performance: [Getter/Setter],
+  fetch: [Function: fetch],
+  crypto: [Getter],
+  navigator: [Getter]
+} */
+
+//   const chai = function(){
+//     let username ="kalpjeet"
+//     console.log(this.username) //undefined
+//   }
+
+// const chai = () =>{
+//     let username = "kalpjeet"  
+//     console.log(this.username);//undefined
+//     console.log(this);//{}
+// }
+//chai()
+
+const addTwo = (num1, num2) => {
+    return num1+num2
+}
+console.log(addTwo(4, 7))//11
+
+//const addTwo = (num1, num2) => num1 + num2
+//console.log(addTwo(4, 7))//11
+
+const addTwo3 = (num1, num2) => ({username: "hitesh"})
+console.log(addTwo3(3,4))//{ username: 'hitesh' }
+
+const myArray = [2, 5, 3, 7, 8]
+myArray.forEach(function () {})
+myArray.forEach(() => {})