Destructuring Objects and Arrays in JavaScript
Learn how to use the destructuring syntax to work with arrays and objects in JavaScript
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
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