ES6 Rest Operator in Javascript

ES6 Rest Operator

The rest operator in JavaScript is used to collect all remaining arguments of a function into a single array. It is represented by three consecutive dots (...) followed by a parameter name. This operator is particularly useful when you have a function that accepts a variable number of arguments.

 
ES6 is different version of the ECMAScript specification. Which is the standard that defines the scripting language that javascript is based on.

ES6 release on 2015 and there are so many features Arrow function, classes, let and const for variables.

Suppose we have a function with some parameter like -

function  sum(a, b) {
    return a+b;
}

sum(2, 6)  // output is 8

But there is some problem because of if user have 2 paramters then we  will enter the value of 2 paramters only But if we use this like below - 

function sum(...args) {
    console.log(args)
}

sum(2, 5, 4, 7)

when we use this type of method we can print all the numbers as a argument value like 2, 5, 4, 7 and also we can add these all numbers.

Actually we have used this code in reactjs called as TheArrow.jsx

Example

import React from 'react'

function TheRest() {

    const therest = ( num1, num2, ...args) => {
       
            console.log(`The number is ${args}`)
            let sum = num1 + num2;
            for(let i = 0; i < args.length; i++) {
                sum +=args[i];
            }
            console.log('The total sum is' , sum);
    }

    therest(2, 3, 4, 5)
  return (
    <div>
    
    <h1>Check console</h1>
    
    
    </div>
  )
}

export default TheRest

Output

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