JavaScript ES6

const sum =(a,b)=> a+bconsole.log(sum(2,6)//prints 8

function print(a=5){console.log(a)}print();//prints 5

let a=3;if(true){let a=5;console.log(a);//prints 5}console.log(a);//prints 3

//can be assigned only oncevar x = 50;// Here x is 50{  const x = 16;  console.log(x);// Here x is 16}console.log(x); // Here x is 50

console.log('This is a multiline string');

const name ='World'const message ='Hello ${name}'console.log(message)//Prints Hello World

const byte =2**8//same as : Math.pow(2,8)

Const a=[1,2]const b=[3,4]const c=[...a,...b]console.log(c) //[1,2,3,4]

Console.log('apple'.includes('p1))//Prints trueconsole.log('apple'.includes('tt))//prints false

console.log('ab.repeat(3))//prints 'ababab'

let [a,b] =[3,7];console.log(a);//3console.log(b);//7

let obj ={a:55,b:44};let{a,b}= obj;console.log(a);//55console.log(b);//44

const a=2const b=5const obj={a,b}//before es6://obj ={a:a,b:b}console.log(obj3);//{a:2,b:5}

const obj1 ={a:1}const obj2 ={b:2}const obj3 =object.assign({},obj1,obj2)console.log(obj3)//{a:1 ,b:2}

promise.then ((result) => {...}).catch(error) => {..}).finally(() => { //Logic independent of success/error })