'use strict';

/* Utilities for random numbers. */

// From https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/random
function getRandomInt(max) {
    return Math.floor(Math.random() * Math.floor(max));
}
function getRandomBool() {
    return getRandomInt(2) == 1;
}
function getRandomLetter() {
    return (10 + getRandomInt(26)).toString(36);
}

// From https://stackoverflow.com/a/2450976
function shuffle(array) {
    let currentIndex = array.length, temporaryValue, randomIndex;

    // While there remain elements to shuffle...
    while (0 !== currentIndex) {

        // Pick a remaining element...
        randomIndex = Math.floor(Math.random() * currentIndex);
        currentIndex -= 1;

        // And swap it with the current element.
        temporaryValue = array[currentIndex];
        array[currentIndex] = array[randomIndex];
        array[randomIndex] = temporaryValue;
    }

    return array;
}