How to use federated types in JavaScript

This article will explain in detail how to use federation types 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.

Joint type

In JavaScript, you want the property to be one of many types, such as a string or an array. This is where union types can come in handy (it uses | as a tag, such as string | number).

Function formatCommandline (command: string [] | string) {let line =''; if (typeof command = = 'string') {line = command.trim ();} else {line = command.join ('') .trim () }} this is the end of the article on "how to use federation types in JavaScript". 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, please share it for more people to see.