Returns a random element from the given array.

Example:

import { sample } from "https://deno.land/std@0.116.0/collections/mod.ts"
import { assert } from "https://deno.land/std@0.116.0/testing/asserts.ts";

const numbers = [1, 2, 3, 4];
const random = sample(numbers);

assert(numbers.includes(random as number));