Enum.to_sym for regular enums. #4598

akzhan · 2017-06-20T09:04:55Z

It's useful to write expressions like that:

value = Color::Red

case value.to_sym
  when :red
     "wine"
  when :green
     "absinthe"
end

I wanted it to simplify expressions like

when Cldr::Core::CalendarSystem::Lunisolar
   "oh no"
end

P.S.: There is no easy way to apply this to flags.

….to_sym" expressions.

Arcovion · 2017-06-20T09:22:03Z

Simply use: (code here)

enum Color
  Red
  Green
end

value = Color::Red

case value
when .red?
  puts "wine"
when .green?
  puts "absinthe"
end

Using symbols sacrifices type safety: you can easily misspell a symbol, but methods are always looked up and checked.

akzhan · 2017-06-20T09:24:01Z

@Arcovion wow, thanks. Doesn't know about when .proc syntax :)

Enum.to_sym for regular enums, it's useful to write short "case value…

6b596fd

….to_sym" expressions.

akzhan closed this Jun 20, 2017

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