Created
September 10, 2017 10:50
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| ... | |
| add ({ x, y }) { | |
| return Vector2D(this.x + x, this.y + y) | |
| }, | |
| subtract ({ x, y }) { | |
| return Vector2D(this.x - x, this.y - y) | |
| } | |
| ... |
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