JS challenge http://gist.github.com/3134886

gistfile1.js

function Point(x, y, a, i) {
    if (y === void 0) {
        a = x.slice(1, -1).replace(/}{/g,',').split(',').map(parseFloat);
        for (x = y = i = 0; i < a.length; i += 2) x += a[i], y += a[i+1];
    }
    this.toString = function () {return '{' + [x, y] + '}'};
}