Dynamic Enum keys in Typescript

Question

Let's say I have defined

enum Sort {
  nameAsc = 'nameAsc',
  nameDesc = 'nameDesc'
}

Can I do something like this?

const key = 'name' + 'Desc';
Sort[key]

Thanks in advance

Does this answer your question? dynamically access enum in typescript by key — Son Nguyen
– Son Nguyen, Commented Feb 9, 2021 at 11:08

Nino Filiu · Accepted Answer · 2019-03-02 12:26:57Z

4

Yes

This:

// index.ts
enum Sort {
    nameAsc = 'nameAscValue',
    nameDesc = 'nameDescValue'
}
const key = 'name'+'Desc';
console.log(Sort[key]);

Compiles to (using tsc index.ts):

// index.js
var Sort;
(function (Sort) {
    Sort["nameAsc"] = "nameAscValue";
    Sort["nameDesc"] = "nameDescValue";
})(Sort || (Sort = {}));
var key = 'name' + 'Desc';
console.log(Sort[key]);

Which outputs (using node index.js):

nameDescValue

answered Mar 2, 2019 at 12:26

Nino Filiu

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1 Comment

Titian Cernicova-Dragomir Over a year ago

It only compiles if noImplictAny is not turned on and isn't type-safe. WIth no implicit any you need an extra assertion Sort[key as keyof typeof Sort]

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