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Clarify that can is sometimes a valid verb for predicate names #959

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4 changes: 3 additions & 1 deletion README.adoc
Original file line number Diff line number Diff line change
Expand Up @@ -1047,9 +1047,11 @@ end

=== Predicate Methods Prefix [[bool-methods-prefix]]

Avoid prefixing predicate methods with the auxiliary verbs such as `is`, `does`, or `can`.
Avoid prefixing predicate methods with the auxiliary verbs such as `is`, `has` or `does`.
These words are redundant and inconsistent with the style of boolean methods in the Ruby core library, such as `empty?` and `include?`.

NOTE: `can` should also be avoided when possible, but is also useful when meaning "allowed to".

[source,ruby]
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# bad
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