JavaScript example of random picking from a list.

pickone.js

// Author: Mitch Allen
// File: pickone.js

let pickOne = (list) => list[Math.floor(Math.random() * list.length)]

let LIMIT = 5;

let list = [...Array(LIMIT)].map(() => Math.random());

console.log(list);

let item = pickOne(list);

console.log("PICK: ", item);

// check occurrences

let PICK_LIMIT = 100;

let picks = [...Array(PICK_LIMIT)].map(() => pickOne(list));

const occurrences = picks.reduce(function (acc, curr) {
    return acc[curr] ? ++acc[curr] : acc[curr] = 1, acc
}, {});

console.log("PICK OCCURRENCES:")
console.log(occurrences);