CODEWITHSUNDEEP
typescriptgenericsstring-literalstypescript-generics
gugamm
gugamm

Reputation: 43

How can I create a generic type for a dynamic generated object created from an array

I'm trying to generate a type definition for a function that generates an object from an array of props, but I'm having problems with this.

The problem is that in { [K in T]: boolean }, I'm not being able to iterate over the type T.

Here's what I'm trying to do:

const createObject = <T extends string[]>(props: T): { [K in T]: boolean } => {
  return props.reduce((acc: any, prop: string) => {
    acc[prop] = true
    return acc
  }, {})
}

Thanks

Upvotes: 0

Views: 64

Answers (1)

Juraj Kocan
Juraj Kocan

Reputation: 2878

just a little bit workaround... here you are

const createObject = <T extends string>(props: T[]): {[K in T]: boolean} => {
  return props.reduce((acc: any, prop: string) => {
    acc[prop] = true;
    return acc;
  }, {});
};

const testObj = createObject(['one', 'two']);
const one = testObj.one;
const two = testObj.two;
const three = testObj.three; // ERROR

Upvotes: 3

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