24Dec2019 TIL

Today I learned :

• ES6 (Destructing Assignment / Spread Operators / Rest Operators / Default Parameters)

 

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Destructing Assignment

let user = {
	name : 'monkey',
    	age : 30
 };
 
function greeting ({name, age}) {
	console.log(`hi ${name}! Your age is ${age}`);
 };
 
greeting(user); 	// 'hi monkey! Your age is 30'
    

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Spread Operators

let sum =  (a, b, c, d) => a+b+c+d;
let arr = [1, 2, 3, 4];
sum(...arr);	// 10

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Rest Operators

function xyz (x, y, ...z) {
	console.log(`${x} ${y}`);	// 'Merry Christmas'
  	console.log(`${z}`);		// 'Happy,new,year'
};

xyz('Merry', 'Christmas', 'Happy', 'new', 'year');

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Default Parameters

function ab (a, b = 'bubble') {
	console.log(a+b);
};

ab('apple'); // 'applebubble'