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proc
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ruby34
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ri
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system
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Enumerable
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Filename :
lazy-i.ri
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U:RDoc::AnyMethod[iI" lazy:ETI"Enumerable#lazy;TF: publico:RDoc::Markup::Document: @parts[ o: RDoc::Markup::Paragraph; [I"BReturns an Enumerator::Lazy, which redefines most Enumerable ;TI"Emethods to postpone enumeration and enumerate values only on an ;TI"as-needed basis.;To: RDoc::Markup::BlankLine S:RDoc::Markup::Heading: leveli: textI" Example;T@o; ; [I"5The following program finds pythagorean triples:;T@o:RDoc::Markup::Verbatim; [I" def pythagorean_triples ;TI"/ (1..Float::INFINITY).lazy.flat_map {|z| ;TI" (1..z).flat_map {|x| ;TI" (x..z).select {|y| ;TI"! x**2 + y**2 == z**2 ;TI" }.map {|y| ;TI" [x, y, z] ;TI" } ;TI" } ;TI" } ;TI" end ;TI"*# show first ten pythagorean triples ;TI"Mp pythagorean_triples.take(10).force # take is lazy, so force is needed ;TI";p pythagorean_triples.first(10) # first is eager ;TI".# show pythagorean triples less than 100 ;TI">p pythagorean_triples.take_while { |*, z| z < 100 }.force;T: @format0: @fileI"enumerator.c;T:0@omit_headings_from_table_of_contents_below0I" e.lazy -> lazy_enumerator ;T0[ I"();T@(FI"Enumerable;TcRDoc::NormalModule00