Returning an object with functions (CodeCombat)

gistfile1.txt

function summonHero (name, position) {
    return {
        say: function (sentence) {
            alert(sentence);
        },
        move: function (position) {
            console.log('Moving to x=' + position.x + ' and y=' +position.y);
            this.pos = position;
        },
        name: name,
        pos: position
    };
}

var ana = summonHero('Ana', {x:0,y:0});
console.log(ana.say('hello'));
console.log(ana.pos);
console.log(ana.move({x:10,y:10}));
console.log(ana.pos);