eloquent Sum of a range

by Rich Costello

JavaScript

function range(start, end, step) {
	if (step == null) step = 1;
    var array = [];
    
    if (step > 0) {
    	for (var i = start; i <= end; i += step)
            array.push(i);
    } else {
      for (var i = start; i >= end; i += step)
          array.push(i);
    }
    return array;
}


function sum(array) {
	var total = 0;
    for (var i = 0; i < array.length; i++)
        total += array[i];
    return total;
}

console.log(sum(range(1, 10)));

console.log(range(5, 2, -1));