See my reply to your previous post Re: More Pong in SDL.
$paddle->y is a 'getter' method to get the y position of the $paddle object.
$paddle->y(value) is a 'setter' method to set the y position of the $paddle object.

So the code $paddle->y( $paddle->y + ( $v_y * $step ) )increment the y position by the velocity * step

Also there is an error in line 155.

#return of $A->left   > $B->right;
return if $A->left   > $B->right;

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poj

In reply to Re: Movement handlers in SDL by poj
in thread Movement handlers in SDL by drose2211

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