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Rubyのlambdaリテラル

Last updated at Posted at 2012-02-12

矢じるしと引数リストのカッコがくっついてないとエラーになるよ

sytanx-error.rb
-> (x) { x+1 }
irb
SyntaxError: (irb):7: syntax error, unexpected tLPAREN_ARG, expecting keyword_do_LAMBDA or tLAMBEG
-> (x) { x+1 }
success.rb
->(x) { x+1 }

ちなみにカッコなしだと

success.rb
-> x { x+1 }
->x { x+1 }

どちらも関数をつくってくれます

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