How to get enum key with enum value in typescript

Question

In the project i am working on we have this widely used enum:

export enum A{
    Document = '1',
    Person = '2',
    Organization = '3',
    Equipment = '4',
    Location = '5',
    Event = '6',
    Link = '7',
    Target = '8',
}

Example: I want to get Organization with A['3']

You didn't mention this as a requirement, but I thought it might be useful to note that it's not possible for the compiler to infer the string literal value of the key during this kind of lookup, so its type will simply be string | undefined without an assertion (or just string if noUncheckedIndexedAccess is disabled). Example: tsplay.dev/WJyQVm — jsejcksn
– jsejcksn, Commented Aug 3, 2022 at 13:51
Does this answer your question? How to get names of enum entries? — Behemoth
– Behemoth, Commented Aug 3, 2022 at 14:04
^ @Behemoth That one is for numeric enums. String enums don’t have reverse mappings. — jsejcksn
– jsejcksn, Commented Aug 3, 2022 at 14:26

Stanley · Accepted Answer · 2022-08-03 13:35:22Z

2

Object keys

enum A {
    Document = '1',
    Person = '2',
    Organization = '3',
    Equipment = '4',
    Location = '5',
    Event = '6',
    Link = '7',
    Target = '8',
}

console.log(Object.keys(A)[Object.values(A).indexOf("1")]);

answered Aug 3, 2022 at 13:35

Stanley

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Comments

mickl · Accepted Answer · 2022-08-03 13:34:32Z

1

You can use Object.entries to do that:

enum A{
    Document = '1',
    Person = '2',
    Organization = '3',
    Equipment = '4',
    Location = '5',
    Event = '6',
    Link = '7',
    Target = '8',
}

const param = '3';
const value = Object.entries(A).find(([_, v]) => v === param)![0];

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answered Aug 3, 2022 at 13:34

mickl

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