Re: enums 1.0 library / gem - safe enumeration types for ruby e.g. enum :Color, [:red, :green, :blue]

This looks really neat. Does it have any runtime dependencies?

Is it possible to assign a specific integer values to a symbol? For some
symbols? Or perhaps all or no symbols?

Thanks!

On 2/28/19 10:41 AM, Gerald Bauer wrote:
> Hello,
>
>     I've put together a new enums library / gem [1] for safe
> enumeration types in ruby.
>
> Yes, enums are just a set of symbolic keys bound to unique integer numbers.
> Why not just use symbols :-) or constants? Do we really need a new enum type
> and (yet another) library? Good point.
>
>    Let the ruby meta-programming magic work for you :-).
>
>      Enum.new( 'Color', :red, :green, :blue )   # -or-
>
>      enum :Color, :red, :green, :blue    # -or-
>
>      enum :Color, [:red, :green, :blue]
>
>    See what you get for "free":
>
>      Color::RED           #=> <Color @key=:red, @value=0>
>      Color(0)             #=> Color::RED -or- <Color @key=:red, @value=0>
>      Color.zero           #=> same as Color(0)
>      Color.red            #=> Color::RED
>      Color.values         #=> [0, 1, 2]
>      Color.keys           #=> [:red, :green, :blue]
>      Color.members        #=> [RED, GREEN, BLUE]
>                           #    -or-
>                           #   [<Color @key=:red,   @value=0>,
>                           #    <Color @key=:green, @value=1>,
>                           #    <Color @key=:blue,  @value=2>]
>      Color(1)             #=> Color::GREEN
>      Color.value(1)       # same as Color(1)
>      Color[:red]          #=> Color::RED
>      Color.key(:red)      # same as Color[:red]
>      color = Color.red
>      color.red?           #=> true
>      color == Color.red   #=> true
>      color.value          #=> 0
>      color.key            #=> :red
>      color.blue?          #=> false
>      color == Color.blue  #=> false
>      color.is_a? Enum     #=> true
>      color.is_a? Color    #=> true
>
>     and some more.
>
>    Questions? Comments? Welcome. Cheers. Prost.
>
> PS: The new enums 1.0 library is part of the safe data structures series. [2]
>
> [1] https://github.com/s6ruby/enums
> [2] https://github.com/s6ruby/safestruct
>
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