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This article introduces the knowledge of "instance usage of findIndex () in javascript array". Many people will encounter this dilemma in the operation of actual cases, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

1. The findIndex () method calls the function once for each element in the array.

Within the callback function, the index position of the first element that passes the detection is returned using the given added filter element.

2. When the element in the array returns true when the condition is tested, findIndex () returns the index position of the element that meets the condition.

Subsequent values will no longer call the execution function.

Returns-1 if no eligible element is returned.

Syntax:

Array.findIndex (function callbackfn (Value,index,array), thisValue)

The syntax of this method is similar to find (), and the parameter value can be the parameter find () method.

Example

Function checkAdult (age) {return age > = 18;} var ages = [3,10,18,20]; var age=ages.findIndex (checkAdult); console.log (age); console.log (ages [age]); "instance usage of findIndex () in the javascript array" ends here. Thank you for reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!

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