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This article mainly shows you "how to use the Array.of method and expand the operator copy array in JavaScript", the content is easy to understand, clear, hope to help you solve the doubt, the following let the editor lead you to study and learn "how to use the Array.of method and expand the operator copy array in JavaScript" this article.

Use the Array.of method and the expansion operator const numbers = [1, 2, 3, 4, 5]; const copy = Array.of (.. array); copy.push (6); / / add a new entry to prove that the original array console.log (copy); console.log (numbers); / / output / / [1, 2, 3, 4, 5, 6] / [1, 2, 3, 4, 5]

The Array.of () method creates a new array instance with a variable number of arguments, regardless of the number or type of parameters. The difference between the Array.of () and Array constructors is that they deal with integer parameters: Array.of (7) creates an array with a single element of 7, while Array (7) creates an empty array of length 7 (note: this is an array of seven empty, not an array of seven undefined).

Array.of (7); / / [7] Array.of (1, 2, 3); / / [1, 2, 3] Array (7); / / [,] Array (1, 2, 3); / / [1, 2, 3] are all the contents of this article entitled "how to use Array.of methods and expand operators to copy arrays in JavaScript". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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