Return a random integer with JavaScript

randInt.js

function randInt (maximum) {
    return Math.floor(Math.random() * maximum);
}

function randBetween (minimum, maximum) {
    return Math.floor(Math.random() * (maximum - minimum) + minimum);
}

// This version is not zero-indexed
function randIntPlusOne (maximum) {
    return Math.floor(Math.random() * maximum + 1);
}