How can I convert a string to an enum in TypeScript?

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1

How can I convert a string to an enum in TypeScript?

I have defined the following enum in TypeScript:

enum Color {
    Red,
    Green
}

In my function, I receive the color as a string. I tried the following code: var green = “Green”; var color: Color = green; // Error: can’t convert string to enum

How can I properly convert a string value to a Color enum using TypeScript? I’m looking for a solution to convert a typescript string to enum.

2

Hey Archna.vv,

Using a Custom Mapping Function : If you want more control or need to handle cases where the string might not directly map to an enum value, you can create a custom mapping function.

enum Color {
    Red,
    Green
}

function stringToEnum(value: string): Color | undefined {
    switch (value) {
        case "Red":
            return Color.Red;
        case "Green":
            return Color.Green;
        default:
            return undefined; // or throw an error if you prefer
    }
}

const colorName = "Green";
const color: Color | undefined = stringToEnum(colorName);

console.log(color); // Output: 1 (Green's numeric value)
3

Hey Archana,

Using a Custom Mapping Function : If you want more control or need to handle cases where the string might not directly map to an enum value, you can create a custom mapping function.

enum Color {
    Red,
    Green
}

function stringToEnum(value: string): Color | undefined {
    switch (value) {
        case "Red":
            return Color.Red;
        case "Green":
            return Color.Green;
        default:
            return undefined; // or throw an error if you prefer
    }
}

const colorName = "Green";
const color: Color | undefined = stringToEnum(colorName);

console.log(color); // Output: 1 (Green's numeric value)