How to implement function Parameter Validator by JavaScript

This article will explain in detail how to implement the function parameter verifier in JavaScript. The editor thinks it is very practical, so I share it for you as a reference. I hope you can get something after reading this article.

Function parameter verifier

JavaScript allows you to set default values for function parameters. With this feature, we can implement a little trick to validate function parameters.

Const isRequired = () = > {throw new Error ('param is required');}; const print = (num = isRequired ()) = > {console.log (`printing ${num} `)}; print (2); / / printing 2print (); / / errorprint (null) / / this is the end of printing null's article on "how to implement a function parameter validator in JavaScript". I hope the above content can be helpful to you, so that you can learn more knowledge. if you think the article is good, please share it for more people to see.