Problem 16.Cards Frequencies

function findCardFrequency(array) {
    var cardCounts = {};
    var poker = array.split(/[♥♣♦♠ ]+/);
    len = poker.length - 1;

    for (var i in poker) {
        var card = poker[i];
        if (!cardCounts[card]) {
            cardCounts[card] = 0;
        }
        cardCounts[card]++;
    }
    return cardCounts;
}

var input = 'J♥ 2♣ 2♦ 2♥ 2♦ 2♠ 2♦ J♥ 2♠';
var cards = findCardFrequency(input);
for (var i in cards) {
    var result = (cards[i] * 100) / len;
    result = result.toFixed(2);
    console.log(i + " -> " + result + "%");
}