1
function Tile(position, value) {
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  this.x                = position.x;
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  this.y                = position.y;
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  this.value            = value || 2;
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  this.previousPosition = null;
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  this.mergedFrom       = null; // Tracks tiles that merged together
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}
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Tile.prototype.savePosition = function () {
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  this.previousPosition = { x: this.x, y: this.y };
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};
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Tile.prototype.updatePosition = function (position) {
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  this.x = position.x;
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  this.y = position.y;
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};
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Tile.prototype.serialize = function () {
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  return {
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    position: {
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      x: this.x,
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      y: this.y
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    },
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    value: this.value
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  };
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};
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