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Commit6aad861

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Added topics Arrays,functions,objects,IIFE,closures,DOM
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61 files changed

+2815
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lines changed

‎.vscode/launch.json

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{
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// Use IntelliSense to learn about possible attributes.
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// Hover to view descriptions of existing attributes.
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// For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
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"version":"0.2.0",
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"configurations": [
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{
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"name":"Attach to Chrome",
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"port":9222,
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"request":"attach",
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"type":"pwa-chrome",
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"webRoot":"${workspaceFolder}"
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},
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{
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"type":"pwa-chrome",
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"request":"launch",
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"name":"Launch Chrome against localhost",
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"url":"http://localhost:8080",
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"webRoot":"${workspaceFolder}"
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}
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]
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}

‎1 functions/index.html

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<!DOCTYPE html>
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<htmllang="en">
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<head>
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<metacharset="UTF-8">
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<metahttp-equiv="X-UA-Compatible"content="IE=edge">
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<metaname="viewport"content="width=device-width, initial-scale=1.0">
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<title>Document</title>
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</head>
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<body>
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dfdsdfsd
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<scriptsrc="script1.js"></script>
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</body>
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</html>

‎1 functions/script1.js

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// f()
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// function f(){
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// console.log("hello")
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// }
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// f()
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// Named functions / function expression
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// //f() // REferenceError: f is not defined
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// f = function func2(){
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// console.log("f2");
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// }
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// f()
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// //func2() // REferenceError: func2 is not defined
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// f()// REferenceError: f is not defined
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// f = function (){
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// console.log("hello ");
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// }
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// f()
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// parameters in functions
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// function add(a, b, c) {
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// console.log(a, b, c);
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// return a + b + c;
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// }
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// console.log(add(1, 2));
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// console.log(add(1));
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// console.log(add(1, 2, 3));
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//Arguments in Functions
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// function printAll() {
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// for (var i = 0; i < arguments.length; ++i) {
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// console.log(arguments[i]);
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// }
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// }
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// printAll("mango", "apple"); // Prints - mango apple
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// printAll('fire', 'water', 'ice', 'gas'); // Prints - fire water ice gas
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// function printAll(a,b) {
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// console.log(arguments.length)
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// console.log(a,b,arguments[0],arguments[1]);
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// for (var i = 0; i < arguments.length; ++i) {
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// console.log(arguments[i]);
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// }
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// }
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// printAll("mango", "apple"); // Prints - mango apple
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// printAll("fire", "water", "ice"); // Prints - fire water ice gas
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// default parameters
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// function findInterest(p, r = 5, t = 1) {
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// console.log("Interest over", t, "years is:", (p * r * t) / 100);
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// }
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// findInterest(1000); // Prints - Interest over 1 years is: 50
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// findInterest(1000, 7); // Prints - Interest over 1 years is: 70
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// findInterest(1000, 8, 2); // Prints - Interest over 2 years is: 160
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// Rest Parameter / Var-args
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// function addAtLeastThree(a, b, c,...numbers) {
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// var sum = a + b + c;
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// for (var i = 0; i < numbers.length; ++i) {
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// sum += numbers[i];
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// }
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// return sum;
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// }
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// console.log(addAtLeastThree(10, 20, 30, 40, 50)); // Prints - 150
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// console.log(addAtLeastThree(12,23,45)); //prints 80
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// hoisting
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// Varible hoisting
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// console.log(a); //prints 'undefined' because only the variable declaration is moved to the top and not it’s definition
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// var a = 10
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// function hoisting
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// f()
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// function f(){
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// console.log("function hoisting")
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// }
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// functions with in functions
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// function outer(){
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// let i=0;
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// function middle(){
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// function inner(){
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// i=10
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// console.log("inner",i);
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// }
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// inner()
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// console.log("middle",i);
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// }
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// //inner() // REference Error : inner is not defined
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// console.log("outer",i)
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// middle()
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// console.log("outer",i)
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// }
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// outer()
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//function expression
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// var factorial = function fac(n) {
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// return n < 2 ? 1 : n * fac(n - 1);
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// };
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// console.log(factorial(3)); // print - 6
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// // console.log(fac(3)); // fac is not defined
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// Anonymous Functions
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// console.log(factorial) // print undefined bcoz factorial is declared as undefined
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//console.log(factorial(3)); //function is not defined
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// var factorial = function (n) {
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// var ans = 1;
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// for (var i = 2; i <= n; i++)
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// ans *= i;
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// return ans;
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// }
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// console.log(factorial(3));
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// passing funcions / Callbacks
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// function factorial(n){
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// let ans=1;
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// for(let i=1;i<=n;i++)
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// ans*=i;
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// return ans;
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// }
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// var ncr = function(n,r,fact){
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// return fact(n)/(fact(r) * fact(n-r))
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// }
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// console.log(ncr(5,3,factorial))
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// var ncr = function(n,r,fact){
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// return fact(n)/(fact(r) * fact(n-r))
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// }
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//// following function is a callback functions passed to ncr()
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// console.log( ncr(5,3,function (n){
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// let ans=1;
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// for(let i=1;i<=n;i++)
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// ans*=i;
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// return ans;
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// })
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// );
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//following function is passed as callback to another function
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// setTimeout(function(){
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// console.log("Timer 2 sec");
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// },2000)
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‎2 arrays/index.html

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<!DOCTYPE html>
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<htmllang="en">
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<head>
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<metacharset="UTF-8">
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<metahttp-equiv="X-UA-Compatible"content="IE=edge">
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<metaname="viewport"content="width=device-width, initial-scale=1.0">
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<title>Document</title>
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</head>
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<body>
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hello
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<scriptsrc="script.js"></script>
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</body>
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</html>

‎2 arrays/script.js

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//Create an array
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// a =[1,2,3];
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// console.log(a);
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// console.log(a.length);
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// console.log(a[0],a[5]);
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// a[5] = 34;
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// console.log(a);
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// console.log(a[4]=33);
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// console.log(a)
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// create an array using new keyword
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//create pushes the element in the array
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// a = new Array(1,2,"raja")
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// console.log(a);
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// //create 2d array
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// a= new Array(a,a);
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// console.log(a)
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// here 2 is the size of array
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// a = new Array(2);
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// console.log(a)
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// here raja is element pushes in the array
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// a = new Array("raja");
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// console.log(a);
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//function methods
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// a = [12,"rajan",12/5]
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// console.log(a);
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// a.push(122) //push at the end
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// console.log(a);
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// a.pop() // Pop from the end
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// console.log(a);
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// a.shift() // pop from the front
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// console.log(a);
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// a.unshift(99) // insert at front
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// console.log(a);
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// a = [12,23,43,56]
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// a.splice(1,1); // delete 1 element form 1st index
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// console.log(a);
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// a.splice(1,0,"rajan","walia") // insert first element from 1st index
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// console.log(a);
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// console.log(a.splice(2,23,122));
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// console.log(a);
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// iterating ver Arrays
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// a = [12,23,22,33]
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// for(let i=0;i<a.length;i++)
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// console.log(a[i])
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// console.log("\n")
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// function print(e){
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// console.log(e);
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// }
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// a.forEach(print);
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// console.log("\n");
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// a.forEach(function (e) {
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// console.log(e)
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// })
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// console.log("\n")
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// a.forEach((e)=>{ console.log(e)
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// })

‎3 hoisting/index.html

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<!DOCTYPE html>
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<htmllang="en">
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<head>
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<metacharset="UTF-8">
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<metahttp-equiv="X-UA-Compatible"content="IE=edge">
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<metaname="viewport"content="width=device-width, initial-scale=1.0">
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<title>Document</title>
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</head>
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<body>
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<scriptsrc="script.js"></script>
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</body>
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</html>

‎3 hoisting/script.js

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//var a=10 -- function scope
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// let a=10 -- block scope
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// a= 10 -- global scope
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// let a = 10;
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// function c(){
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// const b= 20;
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// {
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// let b = 23;
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// console.log(b)
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// }
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// console.log(a)
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// }
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// //console.log(b)
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// c()
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// console.log(b); // undefined bcoz b declared not defined
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// var b= 10;
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l=10;
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console.log(l)
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a();
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//b() // can't access here
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//console.log(a)
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console.log(c)
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c=333;
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functiona(){
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if(1){
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d=20;//
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}
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}
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b=function(){
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c=30;
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console.log("hello ",c);
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}
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console.log(c)
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//a()
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//console.log(typeof a)
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b()//
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console.log(c)

‎4 objects/index.html

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<!DOCTYPE html>
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<htmllang="en">
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<head>
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<metacharset="UTF-8">
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<metahttp-equiv="X-UA-Compatible"content="IE=edge">
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<metaname="viewport"content="width=device-width, initial-scale=1.0">
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<title>Objects</title>
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</head>
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<body>
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<scriptsrc="script.js"></script>
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</body>
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</html>

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