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Lambdas and Pops - Jan Hettich
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Las Vegas Ruby Group
June 18, 2014
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Lambdas and Pops - Jan Hettich
Las Vegas Ruby Group
June 18, 2014
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Transcript
λ's and POP's Jan Hettich LVRUG 5/21/2014
Two kinds of Proc “plain old proc” lambda closure? yes
yes class Proc Proc .lambda? false true semantics yield invocation similar to block method
Creation • “Plain old procs” • Kernel.proc {|args| code} •
Proc.new {|args| code} • Lambdas • Kernel.lambda {|args| code} • literal: ->(args) {code} • Method.to_proc
call syntax • direct call – foo.call(args) – foo[args] –
foo.(args) • block-style call – iterator args, &foo
call semantics • yield semantics (blocks, pops) • similar to
parallel assignment • return => lexically enclosing method • invocation semantics (methods, lambdas) • number of arguments must match • “diminutive return”
Let's look at some code • A Digression on Method
• Argument Passing • return statement • Using next • New behavior in Ruby 2.1.0