enumerable_lz

'enumerable_lz' provides filter and transformation methods in Enumerable module. Also it provides lazy equivalents of some methods in Enumerable.

Fundamental Usage

When require 'enumerable_lz', these lazy methods are provided:

• Enumerable#filter
• Enumerable#filter_with_initproc
• Enumerable#transform

For example (in Ruby 1.9.x):

require 'enumerable_lz'
require 'prime'

(1..Float::INFINITY).transform{|n|n**2+1}.filter{|m|m.prime?}.take(100)
# => [2, 5, ... , 682277, 739601] for a few msec.

Expanded Usage

When require 'enumerable_lz/enumerable_ex', some lazy methods equivalents to original Enumerable method with suffix '_lz' are provided:

• Enumerable#select_lz
• Enumerable#find_all_lz
• Enumerable#reject_lz
• Enumerable#grep_lz
• Enumerable#map_lz
• Enumerable#collect_lz
• Enumerable#drop_lz
• Enumerable#drop_while_lz
• Enumerable#take_lz
• Enumerable#take_while_lz

For example (in Ruby 1.9.x):

require 'enumerable_lz'
require 'enumerable_lz/enumerable_ex'
require 'prime'

(1..Float::INFINITY).map_lz{|n|n**2+1}.select_lz{|m|m.prime?}.take_lz(100).to_a
# => [2, 5, ... , 682277, 739601] for a few msec.

These expanded methods are inplemented with fundamental filter and transformation methods.

Supported Rubies

• Ruby 1.9.x (testing 1.9.2-p0, 1.9.2 p-136)
• Ruby 1.8.7 (testing 1.8.7-p330)
• JRuby 1.5.x (testing 1.5.6)
• MacRuby 0.8

Installation

gem install enumerable_lz

License

The MIT License
Copyright (c) 2011 GOTOH Shunsuke (@antimon2)

Please see LICENSE.txt for details.