Array constant : Constants « Language Basics « Ruby

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Ruby » Language Basics » Constants   Array constant RGB_COLORS = [:red, :green, :blue]        # => [:red, :green, :blue] RGB_COLORS << :purple                     # => [:red, :green, :blue, :purple] RGB_COLORS = [:red, :green, :blue] # warning: already initialized constant RGB_GOLORS RGB_COLORS                                # => [:red, :green, :blue] RGB_COLORS.freeze RGB_COLORS << :purple # TypeError: can't modify frozen array   Related examples in the same category 1.  Constants in Ruby start with an uppercase letter 2.  Ruby allows you to change the values in constants by assigning a new value to them: 3.  Change the value of Pi, it'll let you do it, but you'll get a warning: 4.  The Scope of Constants 5.  Constants are defined within the scope of the current class and are made available to all child classes, unless they're overridden: 6.  freeze does nothing since Fixnums are already immutable.

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