enumerabler.rb: Enumerable ã®é…延評価版メソッドライブラリ - ã¾ã‚ã‚ã‚‚ãŸã¨ãˆã°æ•´æ•°ã®é…列ã‹ã‚‰ã€æ¡ä»¶ã«åˆã†è¦ç´ ã®ã†ã¡ã€æœ€åˆã«ç¾ã‚Œã‚‹ 10 個ã ã‘拾ã„ãŸã„ã¨ãã€ã©ã†ã—ã¾ã™ã‹ï¼Ÿ ary.select {|x| x.even? }.take(10) ↑ã“ã‚Œã¯éžå¸¸ã«æ˜Žçžãªãƒ—ãƒã‚°ãƒ©ãƒ ã§ã™ã€‚ã—ã‹ã— select ã¯ã€æœ€åˆã® 10 個ã ã‘ã§ãªãå…¨è¦ç´ ã‚’ãƒã‚§ãƒƒã‚¯ã—ã¦ã—ã¾ã†ãŸã‚ã€ary ãŒå¤§ãã„ã¨ç„¡é§„ã«ãƒ«ãƒ¼ãƒ—ã—ã¾ã™ã€‚ã¾ãŸã€select ã®æˆ»ã‚Šå€¤ã¨ãªã‚‹ä¸é–“é…列も無駄ã§ã™ã€‚ ret = [] ary.each do |x| ret << x if x.even? break if ret.size == 10 end ↑ã“ã‚Œãªã‚‰ 10 個見ã¤ã‹ã£ãŸæ™‚点ã§çµ‚了ã—ã¦ãれるã—ã€ç„¡é§„ãªé…列確ä¿ã‚‚ã‚ã‚Šã¾ã›ã‚“。ã—ã‹ã—éžå¸¸ã«å¼·å¼•ã§åŽŸå§‹çš„ã§ç…©é›‘ãªãƒ—ãƒã‚°ãƒ©ãƒ ã§ã‚ã‚Šã€Ruby 1.9 ã®æ™‚代を迎ãˆãŸæ–°äººé¡žã§ã‚る我々ã«ã¯ã€å¯èªæ€§ã‚„メンテナンス性ã«å•é¡ŒãŒã‚ã‚‹ã¨è¨€ã‚ã–ã‚‹ã‚’å¾—ãªã„。一言ã§è¨€ã†ã¨å“ãŒãªã„ã®ã§ã™ã€‚
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