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alchimere/hash_with_default.rb

Created November 14, 2015 17:19
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hash_with_default.rb
# Other syntax without patch
STUDENT_LEVELS = {
freshman: Student::Underclassman,
sophomore: Student::Underclassman,
junior: Student::Upperclassman,
senior: Student::Upperclassman,
graduate: Student::Graduate
}.tap { |h| h.default = Student::Unregistered }
# Other syntax with patch on Hash
class Hash
def with_default(value)
self.default = value
self
end
end
STUDENT_LEVELS = {
freshman: Student::Underclassman,
sophomore: Student::Underclassman,
junior: Student::Upperclassman,
senior: Student::Upperclassman,
graduate: Student::Graduate
}.with_default(Student::Unregistered)
@cokara
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cokara commented Nov 19, 2015

I love this.

@gma
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gma commented Nov 19, 2015

I like the first approach, but I'd be much happier encountering code that didn't patch Hash to just to re-invent API that's provided in the standard library. It's bad for (other people's) productivity.

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