Crystal Notes: Structs

Intro

Structs have a similiar syntax to a Class and are used to hold data.

# Define an Struct.
struct Stuff
  @stuff : String
  property stuff

  def initialize(@stuff)
  end

  def print
    puts(@stuff)
  end

end

# Instatiate the Stuff struct.
s = Stuff.new("my stuff")

# Use the print method.
s.print # => my stuff

Considerations

• Structs are created on the stack and are passed by value.
• Structs are best suited for small amounts of immutible data.
• Structs can be mutible, since values are copied, the behaviour is different from a class.