Function indexBy

indexBy<T, K = never>(
    array: T[],
    setterPropertyName: (element: T, index?: number) => string,
    formatElement?: (element: T, index?: number) => K,
): Record<string, [K] extends [never] ? T : K>
Indexes an array.
Type Parameters
- T
  The type of elements in the array.
- K = never
Parameters
- array: T[]
  Target array.
- setterPropertyName: (element: T, index?: number) => string
  Function that returns the key of the index.
- OptionalformatElement: (element: T, index?: number) => K
  Transformation elements.
Returns Record<string, [K] extends [never] ? T : K>
An object with the indexed elements of the original array.
Example
```
const pets = [
    { type: 'dog', name: 'Fido' },
    { type: 'dog', name: 'Chacalin' },
    { type: 'cat', name: 'Mr. Brown' },
    { type: 'cat', name: 'Night' },
]
console.log(PUtilsArray.index(pets, pet => pet.type))
// {
//     dog: { type: 'dog', name: 'Fido' },
//     cat: { type: 'cat', name: 'Mr. Brown' },
// }
```
- Defined in putils/array.ts:478