Function Overloading in TypeScript

Question

Is function overloading not supported in TypeScript?

I have these two functions:

checkCredits() {
   // my code
}

checkCredits(header: any) {
    // my code
}

And I call the second function like this:

this.checkCredits(this.myObject);

When compiling in vs code I get these errors: Supplied Parameters do not match any signature of call target. Duplicate function implementation.

Related? http://stackoverflow.com/questions/39689763/typescript-duplicate-function-implementation — Timothy G., Mar 06 '17 at 13:29

score 2 · Accepted Answer · answered Mar 06 '17 at 13:31

2

Overloading in typescript is done by using optional parameters.

checkCredits(header?: any) {
    // my code
}

Now you can call:

this.checkCredits(this.myObject);

and

this.checkCredits();

Downside you have the logic in the same function.You can check the issue

answered Mar 06 '17 at 13:31

Suraj Rao

Thanks! I wasn't aware of that. – Rich Mar 06 '17 at 13:56
1

@Rich you can also do it [this](https://github.com/Microsoft/TypeScript-Handbook/blob/master/pages/Functions.md#overloads) way. But didnt seem necessary in your example – Suraj Rao Mar 06 '17 at 13:57

1 Answers1