Sha256: 9ab3385c841dd8075fb7076933c5be02e992db76780b5c2d19355e87c31236e6
Contents?: true
Size: 1.39 KB
Versions: 17
Compression:
Stored size: 1.39 KB
Contents
# frozen_string_literal: true
module ConvenientService
module Utils
module Proc
##
# TODO: Compose.
#
# TODO: Disjunct.
#
class Conjunct < Support::Command
attr_reader :procs
def initialize(procs)
@procs = procs
end
##
# Creates a conjunction of procs.
# All procs should accept only one argument.
#
# For example, let's assume we have two arbitrary functions:
# f(x) and g(x)
#
# Application of the `conjunct` procedure gives a new function h(x) that can be written as follows:
# h(x) = f(x) && g(x)
#
# IMPORTANT: Please, learn what is a conjunction before diving into implementation details.
# - https://en.wikipedia.org/wiki/Logical_conjunction
#
def call
return ->(item) {} if procs.none?
return procs.first if procs.one?
##
# NOTE: reduce tries to use first element as its initial value if not specified explicitly.
# https://ruby-doc.org/core-2.6/Enumerable.html#method-i-reduce
#
# NOTE: proc can be called by `[]`.
# https://ruby-doc.org/core-2.7.1/Proc.html#method-i-5B-5D
#
procs.reduce(->(item) { true }) { |conjunction, proc| ->(item) { conjunction[item] && proc[item] } }
end
end
end
end
end
Version data entries
17 entries across 17 versions & 1 rubygems