range.js

//returns array which includes all numbers from start to end (included)
function range(start, end, step) {
    if(step < 0) step = -step;
    if(!step) step = 1;
    
    if(end == undefined) { 
        end = start;
        start = 0;
    }
    var result = [];
    var len = end - start;
    var counter = start;
    if (end > start) {
        while (counter <= end) {
            result.push(counter);
            counter += step;
        }
    } else if (end < start){
        while (counter >= end) {
            result.push(counter);
            counter -= step;
        }
    } else {
        result.push(start);
    }
    
    return result;
}