ruby - Exceptions to the "Command-Query Separation" Rule? -

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command-query separation "states every method should either command performs action, or query returns data caller, not both. in other words, asking question should not change answer."

a = [1, 2, 3] last = a.pop

here, in ruby, pop command returns item popped off array.

this example of command and query within 1 method, , seems necessary so.

if case, code smell have method query command?

stack popping well-known exception cqs. martin fowler notes place break rule.

i in case it's not code smell, in general is code smell.


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