Example 1: javascript object destructuring
//simple example with object------------------------------
let obj = {name: 'Max', age: 22, address: 'Delhi'};
const {name, age} = obj;
console.log(name);
//expected output: "Max"
console.log(age);
//expected output: 22
console.log(address);
//expected output: Uncaught ReferenceError: address is not defined
// simple example with array-------------------------------
let a, b, rest;
[a, b] = [10, 20];
console.log(a);
// expected output: 10
console.log(b);
// expected output: 20
[a, b, ...rest] = [10, 20, 30, 40, 50];
console.log(rest);
// expected output: Array [30,40,50]
Example 2: object destructuring
const book = {
title: 'Ego is the Enemy',
author: 'Ryan Holiday',
publisher: {
name: 'Penguin',
type: 'private'
}
};
const {title: bookName = 'Ego', author, name: {publisher: { name }} = book, type: {publisher: { type }} = book } = book;
Example 3: javascript deconstruct object
const objA = {
prop1: 'foo',
prop2: {
prop2a: 'bar',
prop2b: 'baz',
},
};
// Deconstruct nested props
const { prop1, prop2: { prop2a, prop2b } } = objA;
console.log(prop1); // 'foo'
console.log(prop2a); // 'bar'
console.log(prop2b); // 'baz'
Example 4: Object destructuring
Object Destructuring =>
//
The destructuring assignment syntax is a JavaScript expression that makes it
possible to unpack values from arrays,
or properties from objects, into distinct variables.
//
example:
const user = {
id: 42,
is_verified: true
};
const {id, is_verified} = user;
console.log(id); // 42
console.log(is_verified); // true
Example 5: destructuring assignment
Destructuring assignment is special syntax introduced in ES6,
for neatly assigning values taken directly from an object.
const user = { name: 'John Doe', age: 34 };
const { name, age } = user;
// name = 'John Doe', age = 34
Example 6: object destructuring
let a, b, rest;
[a, b] = [10, 20];
console.log(a);
// expected output: 10
console.log(b);
// expected output: 20
[a, b, ...rest] = [10, 20, 30, 40, 50];
console.log(rest);
// expected output: Array [30,40,50]