range(ES6)

Array.range = function(start, end, step) {
    if (end || isNaN(end)) {
        end = start || 0;
        start = 0;
    }
    if (step || isNaN(step)) {
        step = start < end ? 1 : -1;
    }

    const length = Math.max(Math.ceil((end - start) / step), 0) || 0;
    const result = [];
    for (let i = 0; i < length; i++, start+=step) {
        result[i] = start;
    }
    return result;
}