js Destructuring arrays and objects
// 1) Destructure array items
const [first, second,, fourth] = [10, 20, 30, 40];
// 2) Destructure object properties
const { PI, E, SQRT2 } = Math;js Destructuring arrays and objects
// 1) Destructure array items
const [first, second,, fourth] = [10, 20, 30, 40];
// 2) Destructure object properties
const { PI, E, SQRT2 } = Math;destructuring an array
let cars = ['ferrari', 'tesla', 'cadillac'];
let [car1, car2, car3] = cars;
console.log(car1, car2, car3); // Prints: ferrari tesla cadillacDestructuring of object in ES6
function printBasicInfo({firstName, secondName, profession}) {
console.log(firstName + ' ' + secondName + ' - ' + profession)
}
var person = {
firstName: 'John',
secondName: 'Smith',
age: 33,
children: 3,
profession: 'teacher'
}
printBasicInfo(person)Destructuring of array in ES6
function printFirstAndSecondElement([first, second]) {
console.log('First element is ' + first + ', second is ' + second)
}
function printSecondAndFourthElement([, second, , fourth]) {
console.log('Second element is ' + second + ', fourth is ' + fourth)
}
var array = [1, 2, 3, 4, 5]
printFirstAndSecondElement(array)
printSecondAndFourthElement(array)js The equivalent of destructuring arrays and objects
// 1) assuming arr is [10, 20, 30, 40]
const first = arr[0];
const second = arr[1];
// third element skipped
const fourth = arr[3];
// 2)
const PI = Math.PI;
const E = Math.E;
const SQRT2 = Math.SQRT2;Copyright © 2021 Codeinu
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