tapã‹ã‚ã„ã„よtap - http://rubikitch.com/ã«ç§»è»¢ã—ã¾ã—ãŸRuby 1.9ã§å°Žå…¥ã•ã‚ŒãŸObject#tapã¯Ruby 1.8ã§ã‚‚1.8.7ã‹ã‚‰ä½¿ãˆã‚‹ã‚ˆã†ã«ãªã£ãŸã€‚ tapメソッドã¨ã¯ä½•ã‹ã¨ã„ã†ã¨ã€è‡ªåˆ†è‡ªèº«ã«ãƒ–ãƒãƒƒã‚¯ã‚’作用ã•ã›ã¦è‡ªåˆ†è‡ªèº«ã‚’è¿”ã™ã ã‘ã®ãƒ¡ã‚½ãƒƒãƒ‰ã 。ã¤ã¾ã‚Šå‰¯ä½œç”¨å°‚門メソッド。定義ã¯ã„ãŸã£ã¦ç°¡å˜ã€ã‚³ãƒ¬ã€‚ class Object def tap yield(self) self end end ãŸã¨ãˆã°ã€1〜4ã®äºŒä¹—ã®ã†ã¡10以上ã®ã‚‚ã®ã‚’求ã‚ãŸã„ã‚“ã ã‘ã©ã€ãƒ‡ãƒãƒƒã‚°æ™‚ã¨ã‹ã§é€”ä¸çµŒéŽã§ã‚ã‚‹1〜4ã®äºŒä¹—を表示ã—ã¦ã»ã—ã„ãªã‚“ã¦å ´åˆã¯ã“ã‚“ãªæ„Ÿã˜ã«ã€‚ã„らãªããªã£ãŸã‚‰tapã®éƒ¨åˆ†ã‚’消ã›ã°ã„ã„。楽ãƒãƒ³ã€‚ ary = [1, 2, 3, 4] ary.map{|x| x**2}.tap{|a| p a}.select {|x| x>10 } # => [16] # >> [1, 4, 9, 16] ã»ã‹ã«ã‚‚ã€ç ´å£Šçš„メソッドをé©ç”¨ã—ãŸå¾Œã§è‡ªåˆ†è‡ªèº«ã‚’è¿”ã™å ´åˆã«ã‚‚
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