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Contents
require 'rext/module/helpers'
require 'rext/proc/helpers'
module Enumerable
##
# Proxy
#
# The enumerable proxy class is utilized to
# allow methods such as #group_by, #map, and others
# to provide a method call alternative to a block.
#
# For example words.group_by { |word| word.length } can
# be replaced by words.group_by_.length
#
# === See
#
# * Enumerable#proxy
#
class Proxy
instance_methods.each { |m| undef_method m unless m.match(/^__/) }
def initialize object, meth
@object, @method = object, meth
end
def method_missing meth, *args, &block
@object.__send__(@method) { |o| o.__send__(meth, *args, &block) }
end
end
##
# Shortcut for Proxy.new self, +meth+.
def proxy meth
Proxy.new self, meth
end
##
# Return a hash grouped by +block+.
#
# === Examples
#
# words = %w( just some foo bar )
# words.group_by { |word| word.length } # => {3=>["foo", "bar"], 4=>["just", "some"]}
# words.group_by { length } # => {3=>["foo", "bar"], 4=>["just", "some"]}
# words.group_by.length # => {3=>["foo", "bar"], 4=>["just", "some"]}
#
def group_by &block
return proxy(:group_by) unless block
inject({}) do |hash, value|
(hash[block.yield_or_eval(value)] ||= []) << value
hash
end
end
##
# Sexy Symbol#to_proc replacement for mapping enums.
#
# === Examples
#
# names = %w( tj scott joe bob )
# names.every.length.join # => 2533
# names.every.empty?.any? # => false
# names.every { length > 4 }.all? # => true
#
def every &block
block ? proxy(:map).instance_eval(&block) : proxy(:map)
end
##
# Check if all +args+ are included.
#
# === Examples
#
# permissions = 'save', 'edit', 'delete'
# permissions.includes_all? 'save', 'edit' # => true
#
def includes_all? *args
args.all? { |arg| include? arg }
end
end
Version data entries
7 entries across 7 versions & 2 rubygems