Mihai Serban

Cluj-Napoca, Romania 🇷🇴

Software engineer in constant search for new and exciting technologies

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ES6 cheatsheet  —  Spread Operator

Serban Mihai / 20 October 2018

~1 min read

ES6 Spread Operator

Spread Operator

The spread syntax is simply three dots: ... It allows an iterable to expand in places where 0+ arguments are expected.

Calling Functions without Apply:

function doStuff (x, y, z) { }  
var args = [0, 1, 2];  

// Call the function, passing args  
doStuff.apply(null, args);

doStuff(...args);

Using spread operator:

const arr = [2, 4, 8, 6, 0];  
const max = Math.max(...arr);  

console.log(max); //8

Or another example using Math functions:

let mid = [3, 4];  
let arr = [1, 2, ...mid, 5, 6]; //[1, 2, 3, 4, 5, 6]

Combine arrays

let arr = [1,2,3];  
let arr2 = [...arr]; // like arr.slice()  
arr2.push(4)

You can find a more complete ES6 cheetsheet on my Github page.

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