CODEWITHSUNDEEP
typescript
Vasil
Vasil

Reputation: 1

Cannot convert enums to string in typescript 2

Before Typescript 2 version I used to convert enums to string in the following way:

public myFunction(myEnum: MyEnum): string {
   return MyEnum[myEnum];
}

Now with the new version of Typescript the following error is generated: An index expression argument must be of type 'string', 'number', 'symbol' or 'any'.

Do you have an idea how I could fix this?

Upvotes: 0

Views: 669

Answers (1)

Fenton
Fenton

Reputation: 250942

I believe the error you are getting is that you declare that myFunction returns a string, but it actually doesn't return anything...

public myFunction(myEnum: MyEnum): string {
   console.log(MyEnum[myEnum]);
}

Fix it by returning the value...

public myFunction(myEnum: MyEnum): string {
   return MyEnum[myEnum];
}

Or by changing the return type...

public myFunction(myEnum: MyEnum): void{
   console.log(MyEnum[myEnum]);
}

Full example to show things do still work.

enum Example {
    Red,
    Blue,
    Green
}

alert(Example[Example.Red]);

function myFunction(myEnum: Example): string {
   return(Example[myEnum]);
}

alert(myFunction(Example.Blue));

Upvotes: 1

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