Shulou(Shulou.com)06/03 Report--

Editor to share with you how js checks whether the conditions are met. I hope you will get something after reading this article. Let's discuss it together.

1. Every can return only if each condition is met. True,some is any item that satisfies the return true. Filter filters out all items that meet the criteria (empty can not be found).

2. All test arrays are even and return true, otherwise false is returned.

Example

/ / check that all the numbers in the array are even, and return true if they are even, otherwise return falselet arr = [2,4,6,8,9]; / / use the built-in method somelet flag =! arr.some (item = > item% 2! = = 0); / / use the built-in method everylet flag = arr.every (item = > item% 2 = 0); / / use forlet flag = true;for (let I = 0, len = arr.length; I < len) If (arr [I]% 2! = 0) {flag = false; break}} after reading this article, I believe you have a certain understanding of "how to check whether js meets the requirements". If you want to know more about it, welcome to follow the industry information channel. Thank you for reading!

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