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Contents
# frozen_string_literal: true
##
#
#
module ConvenientService
module Utils
module Object
##
# Can be used instead of `return @ivar if defined? @ivar`.
# @see https://www.justinweiss.com/articles/4-simple-memoization-patterns-in-ruby-and-one-gem/
#
# @note: `false` and `nil` are the only values that are considered `falsy` in Ruby.
# @see https://riptutorial.com/ruby/example/2092/truthy-and-falsy-values
# @see https://www.ruby-lang.org/en/documentation/faq/6/
#
# @internal
# NOTE: `falsy` is probably more common than `falsey`.
# - https://developer.mozilla.org/en-US/docs/Glossary/Falsy
#
class MemoizeIncludingFalsyValues < Support::Command
##
# @!attribute [r] object
# @return [Object]
#
attr_reader :object
##
# @!attribute [r] ivar_name
# @return [Symbol, String]
#
attr_reader :ivar_name
##
# @!attribute [r] value_block
# @return [Proc, nil]
#
attr_reader :value_block
##
# @param object [Object]
# @param ivar_name [Symbol]
# @param value_block [Proc]
# @return [void]
#
def initialize(object, ivar_name, &value_block)
@object = object
@ivar_name = ivar_name
@value_block = value_block
end
##
# @return [Object] Value of ivar. Can be any type.
#
def call
Utils::Object.instance_variable_fetch(object, ivar_name, &value_block)
end
end
end
end
end
Version data entries
5 entries across 5 versions & 1 rubygems