How to realize function overloading by typescript

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Function overload

When you want to pass the user parameter, do not pass flag, when you pass para, you will pass flag. You can write something like this:

Interface User {name: string; age: number;} const user = {name: 'Jack', age: 123}; class SomeClass {public test (para: User): number; public test (para: number, flag: boolean): number; public test (para: User | number, flag?: boolean): number {/ / concrete implementation return 1;}} const someClass = new SomeClass (); / / oksomeClass.test (user); someClass.test (123, false) / / Error// someClass.test; / / Argument of type 'number' is not assignable to parameter of type' User'.// someClass.test (user, false); / / Argument of type'{name: string; age: number;}'is not assignable to parameter of type 'number'. These are all the contents of the article "how to achieve function overloading in typescript". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!