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JavaScript How to reflect the ball at an angle?

the same way you're moving the bat. The x direction controls the left/right travel of the ball. A positive value moves the ball right, and negative yields left. When the ball hits the top edge or blocks placed there (A BreakOut clone game) the x changes from pos to neg or the opposite and the y from pos (up direction) to neg. If you hit the side walls the x changes but the y doesn't.
 
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