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This article mainly introduces the js in the filter will not change the original array of related knowledge, the content is detailed and easy to understand, simple and fast operation, with a certain reference value, I believe that after reading this js filter will change the original array of articles will have something to gain, let's take a look at it.

1. Filter ()

Detects array elements and returns an array of all elements that meet the criteria without changing the original array.

2. Use rules

Return then judge the result, take a Boolean value, true will be added to the new filter array, false, will not be added to the filter array.

Var newArr = arr.filter (function (item,index,arr) {return true; / / returns true means return false; / / returns false means failed})

3. Use examples

Var f = arr.filter (function (val,idx,self) {return typeof val = "string";}) console.log (f); / / ["a", "45", "hello"] this is the end of the article on "will the filter in js change the original array". Thank you for reading! I believe you all have a certain understanding of the knowledge of "will the filter in js change the original array". If you want to learn more, you are welcome to follow the industry information channel.

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