It's possible to put the value of a `property` inside other `property` in the same Class/Struct?

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1

Take for example, something like this:

class C
  include YAML::Serializable

  property one : Int32 = 123
  property two : String = "property one is: #{one}"
end

This will not work. But if I do something like this:

struct B
  property one : Int32 = 123
end
class C
  property two : String = "property one is #{B.new.one}"
end

This will work well, but I really wonder if there is “cleaner” way to do something like this.

2

Something like this?

class C
  property one : Int32
  property two : String

  def initialize
    @one = 123
    @two = "property one is: #{@one}"
  end
end

pp C.new # => #<C:0x74bba8553e80 @one=123, @two="property one is: 123">
1 Like
3

I think that lazy initialized properties can get you what you want

class User
  property name : String
  property title : String
  property salutation : String { "#{title}. #{name}" }

  def initialize(@name : String, @title : String)
  end
end

user = User.new("John", "Mr")

pp! user.salutation # => "Mr. John"
user.salutation = "Little John"
pp! user.salutation # => "Little John"
3 Likes