How do I convert a string to enum in TypeScript?

Question

I have defined the following enum in TypeScript:

enum Color{     Red, Green } 

Now in my function I receive color as a string. I have tried the following code:

var green= "Green"; var color : Color = <Color>green; // Error: can't convert string to enum 

How can I convert that value to an enum?

Answer 1

Enums in TypeScript 0.9 are string+number based. You should not need type assertion for simple conversions:

enum Color{     Red, Green }  // To String  var green: string = Color[Color.Green];  // To Enum / number var color : Color = Color[green]; 

Try it online

I have documention about this and other Enum patterns in my OSS book : https://basarat.gitbook.io/typescript/type-system/enums