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U:RDoc::NormalClass[iI"Enumerator:ET@I"Object;To:RDoc::Markup::Document:@parts[o;;[o:RDoc::Markup::Paragraph;[I"?A class which allows both internal and external iteration.;To:RDoc::Markup::BlankLine�o;	;[I";An Enumerator can be created by the following methods.;To:RDoc::Markup::List:
@type:BULLET:@items[o:RDoc::Markup::ListItem:@label0;[o;	;[I"Object#to_enum;To;;0;[o;	;[I"Object#enum_for;To;;0;[o;	;[I"Enumerator.new;T@o;	;[I"BMost methods have two forms: a block form where the contents ;TI"Jare evaluated for each item in the enumeration, and a non-block form ;TI";which returns a new Enumerator wrapping the iteration.;T@o:RDoc::Markup::Verbatim;[I")enumerator = %w(one two three).each
;TI"+puts enumerator.class # => Enumerator
;TI"
;TI"7enumerator.each_with_object("foo") do |item, obj|
;TI"  puts "#{obj}: #{item}"
;TI"	end
;TI"
;TI"# foo: one
;TI"# foo: two
;TI"# foo: three
;TI"
;TI"8enum_with_obj = enumerator.each_with_object("foo")
;TI".puts enum_with_obj.class # => Enumerator
;TI"
;TI"'enum_with_obj.each do |item, obj|
;TI"  puts "#{obj}: #{item}"
;TI"	end
;TI"
;TI"# foo: one
;TI"# foo: two
;TI"# foo: three
;T:@format0o;	;[I"FThis allows you to chain Enumerators together.  For example, you ;TI"?can map a list's elements to strings containing the index ;TI"%and the element as a string via:;T@o;;[I"@puts %w[foo bar baz].map.with_index { |w, i| "#{i}:#{w}" }
;TI"&# => ["0:foo", "1:bar", "2:baz"]
;T;0o;	;[I"=An Enumerator can also be used as an external iterator. ;TI"IFor example, Enumerator#next returns the next value of the iterator ;TI"=or raises StopIteration if the Enumerator is at the end.;T@o;;[
I"8e = [1,2,3].each   # returns an enumerator object.
;TI"puts e.next   # => 1
;TI"puts e.next   # => 2
;TI"puts e.next   # => 3
;TI"*puts e.next   # raises StopIteration
;T;0o;	;[	I"INote that enumeration sequence by +next+, +next_values+, +peek+ and ;TI"4+peek_values+ do not affect other non-external ;TI"Lenumeration methods, unless the underlying iteration method itself has ;TI"$side-effect, e.g. IO#each_line.;T@o;	;[I"LMoreover, implementation typically uses fibers so performance could be ;TI">slower and exception stacktraces different than expected.;T@o;	;[I"CYou can use this to implement an internal iterator as follows:;T@o;;["I"def ext_each(e)
;TI"  while true
;TI"    begin
;TI"      vs = e.next_values
;TI"    rescue StopIteration
;TI"      return $!.result
;TI"
    end
;TI"    y = yield(*vs)
;TI"    e.feed y
;TI"  end
;TI"	end
;TI"
;TI"o = Object.new
;TI"
;TI"def o.each
;TI"  puts yield
;TI"  puts yield(1)
;TI"  puts yield(1, 2)
;TI"	  3
;TI"	end
;TI"
;TI"4# use o.each as an internal iterator directly.
;TI"*puts o.each {|*x| puts x; [:b, *x] }
;TI"8# => [], [:b], [1], [:b, 1], [1, 2], [:b, 1, 2], 3
;TI"
;TI"2# convert o.each to an external iterator for
;TI"*# implementing an internal iterator.
;TI"7puts ext_each(o.to_enum) {|*x| puts x; [:b, *x] }
;TI"7# => [], [:b], [1], [:b, 1], [1, 2], [:b, 1, 2], 3;T;0:
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