How to Use Object Destructuring in JavaScript?
Object destructuring is a JavaScript feature that allows you to unpack values from arrays or objects into individual variables. The object destructuring syntax looks like this. There's quite a lot of flexibility in how you write object destructuring. let = { firstName: "John", lastName: "Smith" }; let person = { fullName: };Object destructuring is most commonly used to extract a single property from an object. When you're done with that property.
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]
Source: developer.mozilla.org
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;
destructuring objects
({ a, b } = { a: 10, b: 20 });
console.log(a); // 10
console.log(b); // 20
// Stage 4(finished) proposal
({a, b, ...rest} = {a: 10, b: 20, c: 30, d: 40});
console.log(a); // 10
console.log(b); // 20
console.log(rest); // {c: 30, d: 40}
Source: developer.mozilla.org
object destructuring into this
const demo = { nextUrl: 'nextUrl', posts: 'posts' };
const target = {}; // replace target with this
({ nextUrl: target.nextUrl, posts: target.communityPosts } = demo);
console.log(target);
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'
Source: developer.mozilla.org
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
Source: developer.mozilla.org
The most common form is to use square brackets, like this:var {name, age} = {name: "John", age: 12};console.log(name); // Johnconsole.log(age); // 12Another option is to use curly braces,