In what way can TS uniquely handle each element of an array as the key of an object?

I am struggling with an object that I need to have keys representing every item in the array, each linked to a value of any. Can anyone provide guidance on how to achieve this?

Unfortunately, I couldn't find a solution.

Here is an example for reference:

const arr = [100, 4, 200, 1,2] 
const obj = {
  100:xx,
  4:xx,
  1:xx,
  2:xx
}

This is what I am trying to achieve. Thank you for your help.

Answer №1

const arr0 = [1, 99, 'foo', 'bar'] as const;

type CustomTest<T extends readonly unknown[], U = any> = { [P in T[number & keyof T] & PropertyKey]: U };

const customTest: CustomTest<typeof arr0> = {
    1: 2,
    99: 'string',
    foo: null,
    bar: Symbol(),
    // @ts-expect-error - 'nonExist' does not exist in type
    nonExist: 0,
};

TS Playground Link hope it helps

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