How to use the filter function in js

This article mainly introduces the relevant knowledge of how to use the filter function in js, the content is detailed and easy to understand, the operation is simple and fast, and has a certain reference value, I believe you will have something to gain after reading this article on how to use the filter function in js. Let's take a look.

1. Filter function

Filter function, which is used to filter out some elements of Array and return the remaining elements.

2. Use grammar

Array.filter (function (currentValue,index,arr), thisValue)

3. Parameters

Function (currentValue, index,arr): must be a function that is executed by every element in the array.

1. CurrentValue: must be the value of the current element.

2. Index: optional, the index value of the current element.

3. Arr: optional, the array object to which the current element belongs.

ThisValue: optional. The value used for this when function (currentValue,index,arr) is executed.

4. Return value

Returns the new array after filtering elements

5. Use example: use filter function to filter multiple conditions

Let filters = {name: xiaoming, age: 17} let keys = Object.keys (filters) let result = list.filter (item = > {return keys.every (key = > filters [key] .indexOf (item[ key]) >-1)}) this is the end of the article on "how to use filter functions in js". Thank you for reading! I believe that everyone has a certain understanding of the knowledge of "how to use the filter function in js". If you want to learn more, you are welcome to follow the industry information channel.