We now remove hard coded values and introduce named variables instead. This will enable us to keep all the required changes, if needed, in one place.
Other than for ctx, I follow the usual convention and (mostly) use
ALL_CAPS to identify global variables. For now, I am more interested in
getting a complete working game quickly than in trying to follow best
code practice and encapsulate everything neatly inside objects, methods and
functions. Nonetheless, by using ALL_CAPS for variable names, I will
be reminded of what needs to be cleaned up at the end.
Next, I will make the ball move. If you think you know how to do this, try it on your own before moving on to the code in the next section.
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