The value of an
if is the value of the last expression found in each of its branches:
a = if 2 > 1 3 else 4 end a #=> 3
if branch is empty, or it’s missing, it’s considered as if it had
nil in it:
if 1 > 2 3 end # The above is the same as: if 1 > 2 3 else nil end # Another example: if 1 > 2 else 3 end # The above is the same as: if 1 > 2 nil else 3 end
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