Typescript create object with properties with given keys

Question

Here is simplified case what i am struggling.

 const createObj = <T extends string>(keys: T[]) => {
  return Object.fromEntries(
   keys.map((key) => [key, 0])
  );
 };

const result = createObj(["hi","hello","gg"] as const)

I hoped the result type would be {hi: 0, hello: 0, gg: 0 } but the result is any ;

Answer 1

you can do it in this way:

function createObj<T extends string>(arr: T[]): Record<T, number> {
  let result = {} as Record<T, number>;

  arr.forEach((x, i) => {
    result[x] = i;
  })

  return result
}


const object = createObj(["hi","hello","gg"])

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