Rubyã®ãƒªãƒ•ã‚¡ã‚¯ã‚¿ãƒªãƒ³ã‚°ã§Null Objectを使ã£ã¦ã‚³ãƒ¼ãƒ‰ã‚’スッã‚リã•ã›ã‚‹æ–¹æ³• - ベルリンã®ITスタートアップã§åƒãジャãƒãƒ»ã‚¶ãƒ»ãƒãƒƒãƒˆãƒªã®æ—¥è¨˜å‰å›žã€Rubyã®ãƒªãƒ•ã‚¡ã‚¯ã‚¿ãƒªãƒ³ã‚°ã§ã‚¤ã‚±ã¦ãªã„コードを美ã—ã„オブジェクト指å‘è¨è¨ˆã®ã‚³ãƒ¼ãƒ‰ã¸æ”¹è‰¯ã™ã‚‹ãŸã‚ã®æ–¹æ³•ã¨ã„ã†è¨˜äº‹ã‚’書ã„ã¦ã€ã„ã„å響をã„ãŸã ã„ãŸã®ã§ç¬¬ï¼’弾を書ã„ãŸã€‚ Ben Orensteinæ°ã®è¬›æ¼”ã§è©±ã•ã‚Œã¦ã„ãŸå‰å›žã®ã¨ã¯ã¾ãŸåˆ¥ã®ãƒªãƒ•ã‚¡ã‚¯ã‚¿ãƒªãƒ³ã‚°æ–¹æ³•ã€‚å…ƒãƒã‚¿ã¯ã“ã¡ã‚‰ã€‚ github.com ã€ãƒªãƒ•ã‚¡ã‚¯ã‚¿ãƒªãƒ³ã‚°å‰ã®ã‚³ãƒ¼ãƒ‰ã€‘ class JobSite attr_reader :contact def initialize(location, contact) @location = location @contact = contact end def contact_name if contact contact.name else 'no name' end end def contact_phone if contact contact.phone else 'no phone'
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