range(generator, 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;
    for (let i = 0; i < length; i++, start+=step) { 
        yield start;
    }
}