18 Spread Operators

JavaScript ES6 (ECMAScript 6) introduced the spread operator. The syntax is three dots(...) followed by the array (or iterable*). It expands the array into individual elements.

Concatenating Arrays

const fruits = ["apple","mango","strawberry"];
const vegetables = ["brinjal","potato","tomato"];

const shopping = [...fruits,...vegetables];
shopping.forEach((item)=>{
    console.log(item);
})

Convert String to Chars

const uname = "Biswajit";
const letters = [...uname];
letters.forEach((letter)=>{
    console.log(letter);
})

Passing as function argument

function addNumbers(n1,n2,n3){
    return n1+n2+n3;
}

const numbers = [1, 4,6];
const addition = addNumbers(...numbers);
console.log(addition);