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destructuring objects

By Unsightly UnicornUnsightly Unicorn on May 08, 2020
({ 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

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8

array destructuring

By Itchy IbisItchy Ibis on Jan 18, 2021
//Without destructuring

const myArray = ["a", "b", "c"];

const x = myArray[0];
const y = myArray[1];

console.log(x, y); // "a" "b"

//With destructuring

const myArray = ["a", "b", "c"];

const [x, y] = myArray; // That's it !

console.log(x, y); // "a" "b"

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3

object destructuring

By FyllsFylls on Apr 10, 2020
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

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5

js object destructuring with defaults

By Energetic EelEnergetic Eel on Oct 28, 2020
// Taken from top stack overflow answer

const { dogName = 'snickers' } = { dogName: undefined }
console.log(dogName) // what will it be? 'snickers'!

const { dogName = 'snickers' } = { dogName: null }
console.log(dogName) // what will it be? null!

const { dogName = 'snickers' } = { dogName: false }
console.log(dogName) // what will it be? false!

const { dogName = 'snickers' } = { dogName: 0 }
console.log(dogName) // what will it be? 0!

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0

object destructuring default value

By Amused AlbatrossAmused Albatross on Jun 03, 2020
let a, b;

[a=5, b=7] = [1];
console.log(a); // 1
console.log(b); // 7

Source: developer.mozilla.org

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0

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