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This article introduces the knowledge of "how to empty arrays in JavaScript". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Assign it to an empty array

You can clear the variable by assigning it to an empty array ([]). Although this method is quite fast, you should pay attention to other references to the original array, because they will remain the same. And it does not work for arrays declared as const.

Let a = [1,2,3,4]; a = []

Set its length to 0

A better option is to set the length of the array to 0. This method is also very fast and can handle const variables.

Let a = [1,2,3,4]; a.length = 0

Use Array.prototype.splice ()

The Array.prototype.splice () method is also an option. Although it has no other disadvantages compared to the previous method, the performance does not seem to be very good, so you may need to consider it.

Let a = [1,2,3,4]; a.splice (0, a.length)

Use Array.prototype.pop ()

The last one is to use Array.prototype.pop (), which is tedious and slow in performance.

Let a = [1, 2, 3, 4]; while (a.length) a.pop (); "how to empty arrays in JavaScript" ends here. Thank you for reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!

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