Shulou(Shulou.com)06/02 Report--

Editor to share with you how to use the find method in the js array. I hope you will get something after reading this article. Let's discuss it together.

1. Find returns the value of the first element in the array that meets the condition, otherwise it returns undefined.

2. The find method executes the callback function on each element in the array and returns the first element value of true.

3. Find does not change the original array.

Example

Array.prototype._find = function (callback) {let res = undefined for (var item0)

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