Shulou(Shulou.com)06/01 Report--

This article is about how JavaScript returns the value of the first element in the array that passes the test. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Returns the value of the first element in the array that passes the test (judged in the function fn)

Array.prototype.find = Array.prototype.find | | function find (fn, ctx) {ctx = ctx | | this; let result; ctx.some ((value, index, arr), thisValue) = > {return fn (value, index, arr)? (result = value, true): false} what is return result} javascript? javascript is a dynamically typed, weakly typed language, object-and event-driven, relatively secure and widely used in client-side web development. It is also a widely used scripting language for client-side Web development. It is mainly used to add dynamic functions to HTML web pages, and now JavaScript can also be used in web servers, such as Node.js.

Thank you for reading! This is the end of the article on "how JavaScript returns the value of the first element that passed the test in the array". 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!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.