Machine learning algorithm that learns underlying patterns in sequences and replicates them using frequency analysis

mLearn.js

/**
 * Machine learning algorithm that learns underlying patterns in sequences and replicates them using frequency analysis.
 * AKA a markov chain XD
 * @function
 * @param {Array|Number} a A sequence or the length of a sequence to return
 * @example
 * // feed it a sequence to learn from
 * m([1,1,2,3,3,2,1]);
 * // have it generate a sequence 7 items long
 * m(7);
 * // feed it more sequences
 * m([3,1,3,3,2,2]);
 * m([5,2,7,2,3,6,1]);
 * // try it again
 * m(10);
 */
function m(a) {
    if (Array.isArray(a)) {
        if (!('d' in m)) m.d = {};
        for(var i = 0, p = null; i < a.length; i++) {
            (m.d[p]?m.d[p]:m.d[p]=[]).push(p=a[i]);
        }
    } else if ("number" == typeof a) {
        for (var i = 0, p = null, o = []; i < a; i++) {
            o.push(p=m.d[p][Math.floor(Math.random()*m.d[p].length)]);
        }
        return o;
    }
}