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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