Rest Parameters

In JavaScript, the rest parameter syntax allows you to represent an indefinite number of arguments as an array within a function parameter. It provides a convenient way to work with functions that can accept a variable number of arguments. The rest parameter is indicated by three dots (…) followed by a parameter name.

Syntax

The rest parameter syntax allows a function to accept an indefinite number of arguments as an array:

   function add(...elements){
     let sum = 0;
     for(let element of elements){
       sum+= element;
     }
     return sum;
   }
   console.log(add(2,4,6)); //12
  

Get The Rest Elements in an Array

   let snacks = ["meatpie", "sausage", "biscuit", "pizza"];
   let drinks = ["coke", "malt", "sprite", "fanta"]
   snacks.push(...drinks);
   console.log(snacks);
  

De-structuring Assignment

Destructuring is the process of unpacking values from an array or properties from objects into distinct variables.

Learn JavaScript online

  let a, b, rest;
  [a, b] = [10, 20];
  console.log(a); //10
  console.log(b); //20
  [a,b, ...rest] = [10,20,30,40,50];
  console.log(rest) //Array[30,40,50]
  

Rest parameters are a powerful feature for writing flexible and readable functions in JavaScript.