Tutorials References Exercises Videos Menu
Website Get Certified Pro NEW

React ES6 Spread Operator

Spread Operator

The JavaScript spread operator (...) allows us to quickly copy all or part of an existing array or object into another array or object.


const numbersOne = [1, 2, 3];
const numbersTwo = [4, 5, 6];
const numbersCombined = [...numbersOne, ...numbersTwo];

Try it Yourself »

The spread operator is often used in combination with destructuring.


Assign the first and second items from numbers to variables and put the rest in an array:

const numbers = [1, 2, 3, 4, 5, 6];

const [one, two, ...rest] = numbers;

Try it Yourself »

We can use the spread operator with objects too:


Combine these two objects:

const myVehicle = {
  brand: 'Ford',
  model: 'Mustang',
  color: 'red'

const updateMyVehicle = {
  type: 'car',
  year: 2021, 
  color: 'yellow'

const myUpdatedVehicle = {...myVehicle, ...updateMyVehicle}

Try it Yourself »

Notice the properties that did not match were combined, but the property that did match, color, was overwritten by the last object that was passed, updateMyVehicle. The resulting color is now yellow.

Test Yourself With Exercises


Use the spread operator to combine the following arrays.

const arrayOne = ['a', 'b', 'c'];
const arrayTwo = [1, 2, 3];
const arraysCombined = [];

Start the Exercise