How to use filter () array filter in JS
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I. Preface
Array filter is a common method of front-end data processing. for the front-end, we need to process the data returned by the back-end before we can get the data we want for further operation. Sometimes the value returned to us by the back end can only be used as a reference.
2. Brief introduction of the method
The filter () method creates a new array of eligible data filtered out of the specified data.
Two characteristics of filter ()
1.filter () does not detect an empty array
2.filter () does not change the original array
The usage of the filter () method:
Array.filter (function (currentValue,index,arr), thisValue) / / currentValue: the value of the current element / / index: the subscript of the current element / / arr: the original array 3. Usage case
1. Get the eligible elements in the array
Const school = [{occupation: "teacher", age:40}, {occupation: "student", age:23}, {occupation: "programmer", age:1}] var newShool = school.filter (item = > item.age > 20) console.log (newShool); / / [{occupation: 'teacher', age:40}, {occupation: 'student', age:23}] Thank you for reading! This is the end of the article on "how to use the filter () array filter in JS". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, you can share it for more people to see!
