How to abbreviate the expansion operator in JavaScript

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Unfold operator

The unfold operator was introduced in ES6, and using the unfold operator can make JavaScript code more efficient and interesting.

Use the expansion operator to replace some array functions.

/ / joining arraysconst odd = [1,3,5]; const nums = [2,4,6] .concat (odd); / / cloning arraysconst arr = [1,2,3,4]; const arr2 = arr.slice ()

Abbreviated as:

/ joining arraysconst odd = [1, 3, 5]; const nums = [2, 4, 6,... odd]; console.log (nums); / / [2, 4, 6, 1, 3, 5] / / cloning arraysconst arr = [1, 2, 3, 4]; const arr2 = [. Arr]

Unlike the concat () function, users can use the extension operator to insert another array into any array.

Const odd = [1,3,5]; const nums = [2,... odd, 4,6]

You can also use the unfold operator with ES6 deconstruction symbols:

Const {a, b,... z} = {a: 1, b: 2, c: 3, d: 4}; console.log (a) / / 1console.log (b) / / 2console.log (z) / / {c: 3, d: 4} Thank you for reading! This is the end of the article on "how to abbreviate the expansion operator of JavaScript". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, you can share it for more people to see!