Parse any value to enum

Question

On an angular 12 app I have the enum:

export enum Policy {
  Admin,
  Manager
}

I try to define a variable of type Policy as follows:

let policy: Policy = Policy[route.data.policy as string];

The type of route.data.policy is any. But I get the error:

Element implicitly has an 'any' type because index expression is not of type 'number'.

How can to parse the value of route.data.policy which would be 'Admin' or 'Manager' to enum?

TL;DR: `let policy: Policy = Policy[route.data.policy as keyof typeof Policy];` [TS Playground](https://www.typescriptlang.org/play?ssl=8&ssc=10&pln=9&pc=3#code/MYewdgzgLgBATiArlApjAvDA3gKBjAEwEMoiAubPfGABxABsBLYATwoHIBBAgW0bHZUAvjiEBuHCgAedOLBRhEPGAAUGzFpXzc+YADRUAskTBEA5ijiiYOeilh0mrCmqebMrjQG0EyFADpiUn9HDRgiCBgAaxQWEAAzGCgWGhQE1XVWAF0xIA) — Heretic Monkey, Aug 23 '21 at 17:10

score 0 · Answer 1 · answered Aug 23 '21 at 17:03

0

What if you type route.data.policy as a Policy? Then you can just have,

let policy: Policy = route.data.policy;

answered Aug 23 '21 at 17:03

David Kidwell

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1
6
15

You mean `let policy: Policy = route.data.policy as Policy`? I didn't know I could parse it that way. – Miguel Moura Aug 23 '21 at 17:09
That actually might work, but what I meant was to go to wherever you define route.data.policy and type that field as a Policy. – David Kidwell Aug 23 '21 at 17:11
I can't. I am getting `route.data.policy` from an Angular method. – Miguel Moura Aug 23 '21 at 17:50
Ah I see. My mistake. I recommend @Heretic Monkey's solution, then. – David Kidwell Aug 23 '21 at 18:49

score 0 · Answer 2 · answered Aug 23 '21 at 17:09

0

You could just add a value to the keys so Manager = 'Manager' this converts the enum so it takes strings in the [] brackets instead of the default numbers based on index.

answered Aug 23 '21 at 17:09

h0p3zZ

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Parse any value to enum

2 Answers2