Function associateBy

associateBy<T>(array, selector): Record<string, T>
Creates a record by associating each element of the input array with a key generated by the selector function.

If the selector produces the same key for multiple elements, the latest one will be used (overriding the ones before it).
Type Parameters
- T
  Type of the elements in the input array.
Parameters
- array: Iterable<T, any, any>
  The array to transform.
- selector: ((el: T) => string)
  The function to extract the key from each element.
  - - (el): string
    - Parameters
      el: T
      Returns string
Returns Record<string, T>
A record with the keys produced by the selector and the elements as values.
Example: Basic usage
```
import { associateBy } from "@std/collections/associate-by";
import { assertEquals } from "@std/assert";

const users = [
  { id: "a2e", userName: "Anna" },
  { id: "5f8", userName: "Arnold" },
  { id: "d2c", userName: "Kim" },
];

const usersById = associateBy(users, (user) => user.id);

assertEquals(usersById, {
  "a2e": { id: "a2e", userName: "Anna" },
  "5f8": { id: "5f8", userName: "Arnold" },
  "d2c": { id: "d2c", userName: "Kim" },
});
```
- Defined in collections/associate_by.ts:39