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U:RDoc::NormalClass[iI"	Lazy:ETI"Enumerator::Lazy;TI"Enumerator;To:RDoc::Markup::Document:@parts[o;;[o:RDoc::Markup::Paragraph;[	I"PEnumerator::Lazy is a special type of Enumerator, that allows constructing ;TI"Nchains of operations without evaluating them immediately, and evaluating ;TI"Rvalues on as-needed basis. In order to do so it redefines most of Enumerable ;TI"Amethods so that they just construct another lazy enumerator.;To:RDoc::Markup::BlankLine�o;	;[I"FEnumerator::Lazy can be constructed from any Enumerable with the ;TI"Enumerable#lazy method.;T@o:RDoc::Markup::Verbatim;[I"Xlazy = (1..Float::INFINITY).lazy.select(&:odd?).drop(10).take_while { |i| i < 30 }
;TI"�# => #<Enumerator::Lazy: #<Enumerator::Lazy: #<Enumerator::Lazy: #<Enumerator::Lazy: 1..Infinity>:select>:drop(10)>:take_while>
;T:@format0o;	;[I"PThe real enumeration is performed when any non-redefined Enumerable method ;TI"Pis called, like Enumerable#first or Enumerable#to_a (the latter is aliased ;TI"'as #force for more semantic code):;T@o;;[
I"lazy.first(2)
;TI"#=> [21, 23]
;TI"
;TI"lazy.force
;TI"#=> [21, 23, 25, 27, 29]
;T;0o;	;[I"LNote that most Enumerable methods that could be called with or without ;TI">a block, on Enumerator::Lazy will always require a block:;T@o;;[I":[1, 2, 3].map       #=> #<Enumerator: [1, 2, 3]:map>
;TI"Q[1, 2, 3].lazy.map  # ArgumentError: tried to call lazy map without a block
;T;0o;	;[I"UThis class allows idiomatic calculations on long or infinite sequences, as well ;TI"Jas chaining of calculations without constructing intermediate arrays.;T@o;	;[I";Example for working with a slowly calculated sequence:;T@o;;[I"require 'open-uri'
;TI"
;TI"1# This will fetch all URLs before selecting
;TI"# necessary data
;TI"/URLS.map { |u| JSON.parse(open(u).read) }
;TI"-  .select { |data| data.key?('stats') }
;TI"  .first(5)
;TI"
;TI"2# This will fetch URLs one-by-one, only till
;TI"5# there is enough data to satisfy the condition
;TI"4URLS.lazy.map { |u| JSON.parse(open(u).read) }
;TI"-  .select { |data| data.key?('stats') }
;TI"  .first(5)
;T;0o;	;[I"IEnding a chain with ".eager" generates a non-lazy enumerator, which ;TI"Iis suitable for returning or passing to another method that expects ;TI"a normal enumerator.;T@o;;[I"def active_items
;TI"  groups
;TI"    .lazy
;TI"    .flat_map(&:items)
;TI"    .reject(&:disabled)
;TI"    .eager
;TI"	end
;TI"
;TI"?# This works lazily; if a checked item is found, it stops
;TI":# iteration and does not look into remaining groups.
;TI"2first_checked = active_items.find(&:checked)
;TI"
;TI"E# This returns an array of items like a normal enumerator does.
;TI"1all_checked = active_items.select(&:checked);T;0:
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