Nested case structures are difficult to understand because you can easily confuse the cases of an inner case as belonging
to an outer statement. Therefore nested case statements should be avoided.
Specifically, you should structure your code to avoid the need for nested case statements, but if you cannot, then consider moving the
inner case to another function.
Noncompliant code example
def foo(n, m)
case n
when 0
case m # Noncompliant; nested case
when 0 then puts "0"
# ...
end
when 1 then puts "1"
else puts "2"
end
end
Compliant solution
def foo(n, m)
case n
when 0
bar(m)
when 1 then puts "1"
else puts "2"
end
end
def bar(m)
case m
when 0 then puts "0"
# ...
end
end
