Looking to retrieve all values from a string enum. For example, in the following enum, I want to extract ["Red", "Yellow"]:
export enum FruitColors {
Apple = "Red",
Banana = "Yellow",
}
Looking to retrieve all values from a string enum. For example, in the following enum, I want to extract ["Red", "Yellow"]:
export enum FruitColors {
Apple = "Red",
Banana = "Yellow",
}
Seeking Object.values() is the way to go
Take a look at the FruitColors object.
Keep in mind that if you do not provide names for the enum values, the resulting code will be different and a basic key/value mapping may produce incorrect outcomes. For example:
export enum FruitColors {
"Red",
"Yellow",
}
Object.values(FruitColors); // ["Red", "Yellow", 0, 1]
This is because the generated code is structured like this:
var FruitColors;
(function (FruitColors) {
FruitColors[FruitColors["Red"] = 0] = "Red";
FruitColors[FruitColors["Yellow"] = 1] = "Yellow";
})(FruitColors = exports.FruitColors || (exports.FruitColors = {}));
You can then easily filter the results by using
typeof value == "string"As stated in a GitHub thread, the recommended approach is:
Object.keys(FruitColors).map(c => FruitColors[c]);
If you're looking to extract all values from a string and number enum type, not just strings, you might consider using this function:
const retrieveAllEnumValues = (enumType: any) => {
const keysAndValues = Object.values(enumType);
const values = [];
keysAndValues.forEach((keyOrValue: any) => {
if (isNaN(Number(keyOrValue))) {
values.push(enumType[keyOrValue] || keyOrValue);
}
});
return values;
};
For example:
enum SampleEnum {
X = "x",
Y = 3,
Z = "z",
W = 2,
}
The function will output [ 2, 3, 'x', 'z' ] as expected.
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