array destructure javascript code example

Example 1: destructuring arrays with rest operator

// Rest operator on Arrays;
// It's usually shown as ...rest
// but you can name this what you like
// Think of it as "get the ...rest of the array"
const [q, r, ...callThisAnythingYouWant] = [1, 2, 3, 4, 5, 6, 7, 8];

console.log(q, r); // 1 2
console.log(callThisAnythingYouWant); // [ 3, 4, 5, 6, 7, 8 ]

Example 2: Destructuring Assignment

const HIGH_TEMPERATURES = {
  yesterday: 75,
  today: 77,
  tomorrow: 80
};

//ES6 assignment syntax
const {today, tomorrow} = HIGH_TEMPERATURES;

//ES5 assignment syntax
const today = HIGH_TEMPERATURES.today;
const tomorrow = HIGH_TEMPERATURES.tomorrow;

console.log(today); // 77
console.log(tomorrow); // 80
console.log(yesterday); // "ReferenceError: yesterday is not defined" as it should be.

Example 3: destructure array javascript

var [first, second, ...rest] = ["Mercury", "Earth", ...planets, "Saturn"];

Example 4: js destructuring explained

const { identifier } = expression;