Destructuring Objects and Arrays in JavaScript

Jan 4, 2019

Learn how to use JavaScript destructuring to pull values out of objects and arrays into named variables, rename them, and skip array items you do not need.

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Given an object, using the destructuring syntax you can extract just some values and put them into named variables:

const person = {
  firstName: 'Tom',
  lastName: 'Cruise',
  actor: true,
  age: 54 //made up
}

const { firstName: name, age } = person //name: Tom, age: 54

name and age contain the desired values.

The syntax also works on arrays:

const a = [1, 2, 3, 4, 5]
const [first, second] = a

This statement creates 3 new variables by getting the items with index 0, 1, 4 from the array a:

const [first, second, , , fifth] = a

Tagged: JavaScript · All topics

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