Function distinctBy

distinctBy<T, D>(array, discriminator): T[]
Returns all elements in the given array that produce a unique value using the given discriminator, with the first matching occurrence retained.

Uniqueness is determined by same-value-zero equality of the returned values.
Type Parameters
- T
  The type of the elements in the input array.
- D
  The type of the values produced by the discriminator function.
Parameters
- array: Iterable<T, any, any>
  The array to filter for distinct elements.
- discriminator: ((el: T) => D)
  The function to extract the value to compare for uniqueness.
  - - (el): D
    - Parameters
      el: T
      Returns D
Returns T[]
An array of distinct elements in the input array.
Example: Basic usage
```
import { distinctBy } from "@std/collections/distinct-by";
import { assertEquals } from "@std/assert";

const users = [{ id: 1, name: "Anna" }, { id: 2, name: "Kim" }, { id: 1, name: "Anna again" }];
const uniqueUsers = distinctBy(users, (user) => user.id);

assertEquals(uniqueUsers, [{ id: 1, name: "Anna" }, { id: 2, name: "Kim" }]);
```
- Defined in collections/distinct_by.ts:30