Maximum Call Stack Size Solution

solution.js

// Must thank Mark McDonnell of Integralist
// http://www.integralist.co.uk/posts/js-recursion.html
// Below is his solution to prevent maximum call stack errors caused by calling
// functions recursively beyond the stack limit.

function tco(f) {
    var value;
    var active = false;
    var accumulated = [];

    return function accumulator() {
        accumulated.push(arguments);

        if (!active) {
            active = true;

            while (accumulated.length) {
                value = f.apply(this, accumulated.shift());
            }

            active = false;

            return value;
        }
    }
}

var sum = tco(function(x, y) {
    if (y > 0) {
      return sum(x + 1, y - 1)
    }
    else {
      return x
    }
});

sum(1, 100000);