Popular posts

I tried this in JavaScript ;-)

function arr (original, maxOccurrences) {
    if (!original) { return null; }
    if (maxOccurrences < 1) { return []; }

    var result = [];
    var itemCounts = {};
    for (var index = 0; index < original.length; index++){
        var item = original[index];
        var count = itemCounts[item] || 0;
        if (count < maxOccurrences) {
            result.push(item);
            itemCounts[item] = count + 1;
        }
    }

    return result;
}