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Contents
# frozen_string_literal: true
require 'singleton' # Use the Singleton design pattern
require_relative 'boolean'
module Loxxy
module Datatype
# Class for representing a Lox false value.
class False < Boolean
include Singleton # Make a singleton class
# Build the sole instance
def initialize
super(false)
end
# Is this object representing a false value in Lox?
# @return [TrueClass]
def false?
true
end
# Is the value considered falsey in Lox?
# Rule: false and nil are falsey and everything else is truthy.
# This test used in conditional statements (i.e. if, while)
def falsey?
true
end
# Is the value considered truthy in Lox?
# Rule: false and nil are falsey and everything else is truthy.
# This test used in conditional statements (i.e. if, while)
def truthy?
false
end
# Check for equality of a Lox False with another Lox object
# @param other [Datatype::BuiltinDatatype, FalseClass, Object]
# @return [Datatype::Boolean]
def ==(other)
falsey = other.kind_of?(False) || other.kind_of?(FalseClass)
falsey ? True.instance : False.instance
end
end # class
False.instance.freeze # Make the sole instance immutable
end # module
end # module
Version data entries
50 entries across 50 versions & 1 rubygems