{"id":314,"date":"2016-10-27T08:50:03","date_gmt":"2016-10-26T23:50:03","guid":{"rendered":"https:\/\/p-corporate-blog-cms.mmmcorp.co.jp\/blog\/2016\/10\/27\/working-effectively-with-legacy-code"},"modified":"2022-10-28T22:28:50","modified_gmt":"2022-10-28T13:28:50","slug":"working-effectively-with-legacy-code","status":"publish","type":"post","link":"https:\/\/p-corporate-blog-cms.mmmcorp.co.jp\/blog\/2016\/10\/27\/working-effectively-with-legacy-code\/","title":{"rendered":"\u30ec\u30ac\u30b7\u30fc\u30b3\u30fc\u30c9\u6539\u5584\u30ac\u30a4\u30c9\u5185\u5bb9\u30e1\u30e2"},"content":{"rendered":"<p>\u5148\u6708\u3042\u305f\u308a\u306b\u8aad\u3093\u3060\u30ec\u30ac\u30b7\u30fc\u30b3\u30fc\u30c9\u6539\u5584\u30ac\u30a4\u30c9\u304c\u9762\u767d\u304b\u3063\u305f\u306e\u3067\u3001\u305d\u306e\u5185\u5bb9\u3092\u30e1\u30e2\u3057\u3066\u307f\u308b\u3002\u69d8\u3005\u306a\u30c6\u30af\u30cb\u30c3\u30af\u304c\u7d39\u4ecb\u3055\u308c\u3066\u3044\u305f\u304c\u3001\u305d\u308c\u3092\u3072\u3068\u3064\u3072\u3068\u3064\u66f8\u3044\u3066\u3044\u308b\u3068\u9577\u304f\u306a\u3063\u3066\u3057\u307e\u3046\u306e\u3067\u3001\u6982\u8981\u3084\u30b3\u30f3\u30bb\u30d7\u30c8\u3092\u30e1\u30a4\u30f3\u306b\u66f8\u3053\u3046\u3068\u601d\u3046\u3002<\/p>\n<ul>\n<li><a href=\"https:\/\/www.amazon.co.jp\/dp\/B01AN97W08\/ref=dp-kindle-redirect?_encoding=UTF8&amp;btkr=1\">Amazon.co.jp: \u30ec\u30ac\u30b7\u30fc\u30b3\u30fc\u30c9\u6539\u5584\u30ac\u30a4\u30c9<\/a><\/li>\n<\/ul>\n<h2 id=\"outline__1\" id=\"\u30ec\u30ac\u30b7\u30fc\u30b3\u30fc\u30c9\u306e\u5909\u66f4\u624b\u9806\">\u30ec\u30ac\u30b7\u30fc\u30b3\u30fc\u30c9\u306e\u5909\u66f4\u624b\u9806<\/h2>\n<p>\u30ec\u30ac\u30b7\u30fc\u30b3\u30fc\u30c9\u306e\u5909\u66f4\u624b\u9806\u306f\u4ee5\u4e0b\u306e\u69d8\u306a\u3082\u306e\u3060\u3002\u3053\u308c\u3092\u57fa\u672c\u3068\u3057\u3066\u3001\u69d8\u3005\u306a\u624b\u6cd5\u3084\u4f8b\u3092\u4ea4\u3048\u3066\u3001\u7ae0\u304c\u9032\u3093\u3067\u3044\u304f\u3002<\/p>\n<ol>\n<li>\u5909\u66f4\u7b87\u6240\u3092\u7279\u5b9a\u3059\u308b<\/li>\n<li>\u30c6\u30b9\u30c8\u3059\u308b\u3079\u304d\u4e8b\u67c4\u3092\u628a\u63e1\u3059\u308b<\/li>\n<li>\u4f9d\u5b58\u95a2\u4fc2\u3092\u6392\u9664\u3059\u308b<\/li>\n<li>\u30c6\u30b9\u30c8\u3092\u66f8\u304f<\/li>\n<li>\u5909\u66f4\u3001\u4fee\u6b63(\u30ea\u30d5\u30a1\u30af\u30bf)\u3092\u884c\u3046<\/li>\n<\/ol>\n<h2 id=\"outline__2\" id=\"\u30c6\u30b9\u30c8\u306e\u91cd\u8981\u3055\">\u30c6\u30b9\u30c8\u306e\u91cd\u8981\u3055<\/h2>\n<p>\u4e00\u8cab\u3057\u3066\u3001\u30c6\u30b9\u30c8\u3092\u66f8\u304b\u306a\u3044\u30b3\u30fc\u30c9\u3053\u305d\u30ec\u30ac\u30b7\u30fc\u30b3\u30fc\u30c9\u3001\u30c6\u30b9\u30c8\u304c\u306a\u3051\u308c\u3070\u3069\u3093\u306a\u306b\u304d\u308c\u3044\u306b\u66f8\u3044\u3066\u3082\u610f\u5473\u304c\u306a\u3044\u3001<code>Edit and Pray<\/code>\u3067\u306f\u306a\u304f<code>Cover and Modify<\/code>\u3001\u3068\u3044\u3046\u3053\u3068\u3092\u8a00\u3063\u3066\u3044\u308b\u3002<\/p>\n<p>\u6b63\u3057\u3044\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u3060\u3051\u3067\u306a\u304f\u3001\u5909\u66f4\u3092\u691c\u77e5\u3059\u308b\u305f\u3081\u306e\u30c6\u30b9\u30c8(\u30ea\u30b0\u30ec\u30c3\u30b7\u30e7\u30f3\u30c6\u30b9\u30c8)\u304c\u66f8\u3051\u308b\u3068\u3088\u304f\u3001\u305d\u308c\u304c\u306a\u3044\u306e\u3067\u3042\u308c\u3070\u3001\u3044\u304b\u306a\u308b\u5909\u66f4\u3082\u5b89\u5168\u3068\u306f\u3044\u3048\u306a\u3044\u3068\u306e\u3053\u3068\u304c\u66f8\u3044\u3066\u3042\u308b\u3002<\/p>\n<h3 id=\"outline__2_1\" id=\"\u5f15\u7528\">\u5f15\u7528<\/h3>\n<blockquote>\n<ul>\n<li>To me, legacy code is simply code without tests. I\u2019ve gotten some grief for this<\/li>\n<li>Code without tests is bad code. It doesn\u2019t matter how well written it is<\/li>\n<li>Working with care doesn\u2019t do much for you if you don\u2019t use the right tools and techniques.<\/li>\n<li>Cover and Modify is a different way of making changes. The idea behind it is that it is possible<\/li>\n<li>Do you want your feedback in a minute or overnight? Which scenario is more efficient?<\/li>\n<li>The beginnings of those iterations are terrible. People feel that they aren\u2019t getting all the work done that they need to. But slowly, they start to discover that they are revisiting better code. Their changes are getting easier,<\/li>\n<li>The way to win is to concentrate effort on not putting bugs into code in the first place.<\/li>\n<li>In general, automated tests should specify a goal that we\u2019d like to fulfill or attempt to preserve behavior that is already there.<\/li>\n<li>they(=\u30ea\u30b0\u30ec\u30c3\u30b7\u30e7\u30f3\u30c6\u30b9\u30c8) just sit there documenting what pieces of the system really do.<\/li>\n<li>The only problem is, if you don\u2019t have tests, this can be pretty hazardous business. How do you know that you aren\u2019t breaking anything when you do all of this refactoring to understand the code?<\/li>\n<\/ul>\n<\/blockquote>\n<h2 id=\"outline__3\" id=\"\u30e6\u30cb\u30c3\u30c8\u30c6\u30b9\u30c8\u306e\u5229\u70b9\">\u30e6\u30cb\u30c3\u30c8\u30c6\u30b9\u30c8\u306e\u5229\u70b9<\/h2>\n<p>\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304c\u7d50\u5408\u3055\u308c\u305f\u72b6\u614b\u3067\u306e\u30c6\u30b9\u30c8\u304c\u5de8\u5927\u306b\u306a\u308b\u3068\u3044\u304f\u3064\u304b\u554f\u984c\u304c\u3042\u308b\u3002<\/p>\n<ul>\n<li>\u30a8\u30e9\u30fc\u304c\u3069\u3053\u3067\u8d77\u304d\u3066\u3044\u308b\u306e\u304b\u30d1\u30c3\u3068\u898b\u3067\u308f\u304b\u3089\u306a\u3044<\/li>\n<li>\u5b9f\u884c\u901f\u5ea6\u306e\u5897\u52a0<\/li>\n<li>\u30ab\u30d0\u30ec\u30c3\u30b8\u304c\u4e0b\u304c\u308b\u3002\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304c\u7d50\u5408\u3055\u308c\u305f\u72b6\u614b\u3060\u3051\u3067\u306f\u3059\u3079\u3066\u3092\u30c6\u30b9\u30c8\u3059\u308b\u306e\u306f\u96e3\u3057\u3044\u3002<\/li>\n<\/ul>\n<p>\u30e6\u30cb\u30c3\u30c8\u30c6\u30b9\u30c8\u306f\u7d50\u5408\u30c6\u30b9\u30c8\u3067\u306f\u3067\u304d\u306a\u3044\u3053\u3068\u3092\u30ab\u30d0\u30fc\u3067\u304d\u308b\u3068\u8ff0\u3079\u3066\u3044\u308b\u3002\u30e6\u30cb\u30c3\u30c8\u30c6\u30b9\u30c8\u306e\u5229\u70b9\u3068\u3057\u3066\u306f\u4ee5\u4e0b\u304c\u3042\u308b\u3002<\/p>\n<ul>\n<li>\u5b9f\u884c\u901f\u5ea6\u304c\u65e9\u3044<\/li>\n<li>\u30a8\u30e9\u30fc\u306e\u7279\u5b9a\u304c\u5bb9\u6613<\/li>\n<\/ul>\n<p>\u9006\u306b\u3001\u30e6\u30cb\u30c3\u30c8\u30c6\u30b9\u30c8\u304c\u3053\u308c\u3089\u3092\u307f\u305f\u305b\u3066\u3044\u306a\u3044\u6642\u306f\u3001\u30c6\u30b9\u30c8\u81ea\u4f53\u3092\u898b\u76f4\u3057\u305f\u307b\u3046\u304c\u3044\u3044\u3068\u8ff0\u3079\u3066\u3044\u308b\u3002<\/p>\n<h3 id=\"outline__3_1\" id=\"\u5f15\u7528-1\">\u5f15\u7528<\/h3>\n<blockquote>\n<ul>\n<li>(\u30e6\u30cb\u30c3\u30c8\u30c6\u30b9\u30c8\u3067\u3042\u3063\u3066\u3082)Some tests are larger, and they use several classes together. In fact, they may seem to be little integration<\/li>\n<li>Over time, the test might end up taking as long as 1\/10th of a second to execute.<\/li>\n<li>When you start to notice that your tests are too large, you should break down the class that you are testing, to make smaller independent pieces that can be tested more easily.<\/li>\n<\/ul>\n<\/blockquote>\n<h2 id=\"outline__4\" id=\"\u5358\u4e00\u8cac\u4efb\u306e\u539f\u5247srp\">\u5358\u4e00\u8cac\u4efb\u306e\u539f\u5247(SRP)<\/h2>\n<p>\u5358\u4e00\u8cac\u4efb\u306e\u539f\u5247(SRP)\u306b\u3064\u3044\u3066\u8ff0\u3079\u3066\u3044\u308b\u3002\u3068\u3042\u308b\u8907\u96d1\u306a\u30af\u30e9\u30b9\u306b\u3001\u5b9f\u306f\u8907\u6570\u306e\u8cac\u4efb\u304c\u62bc\u3057\u4ed8\u3051\u3089\u308c\u3066\u3044\u308b\u3053\u3068\u3092\u30b3\u30fc\u30c9\u3092\u4ea4\u3048\u3066\u8aac\u660e\u304c\u3055\u308c\u308b\u3002\u8907\u96d1\u306a\u30af\u30e9\u30b9\u306f\u30c6\u30b9\u30c8\u304c\u3067\u304d\u306a\u3044\u3057\u3001\u30c6\u30b9\u30c8\u306e\u3057\u6613\u3044\u5358\u4f4d\u3067SRP\u306b\u5f93\u3063\u3066\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u3064\u304f\u3063\u3066\u3044\u304f\u3053\u3068\u304c\u30ec\u30ac\u30b7\u30fc\u30b3\u30fc\u30c9\u306e\u6539\u5584\u306b\u3064\u306a\u304c\u308b\u3002\u30af\u30e9\u30b9\u3084\u30e1\u30bd\u30c3\u30c9\u306e\u8cac\u4efb\u304c\u4f55\u3067\u3042\u308b\u304b\u3092\u898b\u5206\u3051\u308b\u65b9\u6cd5\u3092\u3001\u591a\u304f\u306e\u30d1\u30bf\u30fc\u30f3\u306b\u3088\u3063\u3066\u8aac\u660e\u3057\u3066\u3044\u308b\u3002<\/p>\n<p>\u5b9f\u88c5\u3059\u308b\u969b\u3082\u300c\u3044\u307e\u4f55\u3092\u3057\u3066\u3044\u308b\uff1f\u300d\u3068\u805e\u304b\u308c\u3066\u3072\u3068\u3064\u306e\u7b54\u3048\u306b\u306a\u3089\u306a\u3051\u308c\u3070\u3001\u305d\u308c\u306f\u8003\u3048\u76f4\u3057\u305f\u65b9\u304c\u3044\u3044\u3068\u3044\u3046\u3053\u3068\u3092\u8a00\u3063\u3066\u3044\u308b\u3002\u307e\u305f\u3001\u5fc5\u7136\u7684\u306b\u30b7\u30f3\u30d7\u30eb\u306a\u554f\u984c\u3092\u3068\u304f\u3053\u3068\u3084\u3001\u30d3\u30eb\u30c9\u306e\u901f\u3055\u306a\u3069\u304b\u3089\u3001\u305d\u308c\u304c\u5b9f\u88c5\u901f\u5ea6\u306b\u3082\u76f4\u7d50\u3059\u308b\u3068\u8ff0\u3079\u3066\u3044\u308b\u3002<\/p>\n<h3 id=\"outline__4_1\" id=\"\u5f15\u7528-2\">\u5f15\u7528<\/h3>\n<blockquote>\n<ul>\n<li>What are the problems with big classes? The first is confusion.<\/li>\n<li>The first issue to confront when we have big classes is this: How can we work without making things worse?<\/li>\n<li>The key questions I asked were \u201cWhy is this method here?\u201d and \u201cWhat is it doing for the class?\u201d Then I grouped them into lists, putting together methods that had a similar reason for being there.<\/li>\n<li>Learning to see responsibilities is a key design skill, and it takes practice.<\/li>\n<li>if you have the urge to test a private method, the method shouldn\u2019t be private<\/li>\n<li>The way to really get better at identification is to read more. Read books about design patterns.<\/li>\n<li>More important, read other people\u2019s code. Look at open-source projects, and just take some time to browse and see how other people do things.<\/li>\n<li>I\u2019m working: \u201cProgramming is the art of doing one thing at a time.\u201d<\/li>\n<li>I always ask my partner to challenge me on that, to ask me \u201cWhat are you doing?\u201d If I answer<\/li>\n<li>Frankly, it\u2019s just faster.<\/li>\n<li>When I first started using these techniques, it was tempting to do too much. When I needed to extract<\/li>\n<\/ul>\n<\/blockquote>\n<h2 id=\"outline__5\" id=\"seam\">Seam<\/h2>\n<p>\u3053\u306e\u672c\u3067\u51fa\u3066\u304f\u308b\u91cd\u8981\u306a\u3053\u3068\u3070\u3068\u3057\u3066<code>Seam<\/code>\u3068\u3044\u3046\u3082\u306e\u304c\u3042\u308b\u3002\u5b9a\u7fa9\u3068\u3057\u3066\u306f\u3001<code>\u305d\u306e\u5834\u6240\u3092\u76f4\u63a5\u7de8\u96c6\u3057\u306a\u304f\u3066\u3082\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u632f\u308b\u821e\u3044\u3092\u5909\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u5834\u6240<\/code>\u3068\u3044\u3046\u3082\u306e\u3060\u3002\u3053\u306e<code>Seam<\/code>\u3092\u610f\u8b58\u3057\u306a\u304c\u3089\u3001\u4f9d\u5b58\u95a2\u4fc2\u3092\u6392\u9664\u3057\u3066\u3044\u304f\u4f8b\u304c\u8a73\u3057\u304f\u793a\u3055\u308c\u3066\u3044\u308b\u3002<\/p>\n<p><code>Seam<\/code>\u306b\u306f\u3044\u304f\u3064\u304b\u7a2e\u985e\u304c\u3042\u308a\u3001\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3\u306b\u3088\u3063\u3066\u3001\u3069\u306e\u3088\u3046\u306b\u4f9d\u5b58\u95a2\u4fc2\u3092\u6392\u9664\u3057\u3066\u3044\u304f\u304b\u304c\u8aac\u660e\u3055\u308c\u3066\u3044\u308b\u3002<\/p>\n<h3 id=\"outline__5_1\" id=\"\u5f15\u7528-3\">\u5f15\u7528<\/h3>\n<blockquote>\n<ul>\n<li>One of the biggest challenges in getting legacy code under test is breaking dependencies.<\/li>\n<li>When you have a seam, you have a place where behavior can change.<\/li>\n<li>In general, object seams are the best choice in object-oriented<\/li>\n<li>Preprocessing seams and link seams can be useful at times but they are not as explicit as object seams. In addition, tests that depend upon them can be hard to maintain. I like to reserve preprocessing seams and link seams for cases where dependencies are pervasive and there are no better alternatives.<\/li>\n<\/ul>\n<\/blockquote>\n<h2 id=\"outline__6\" id=\"sprout-method\">Sprout Method<\/h2>\n<p>\u30c6\u30af\u30cb\u30c3\u30af\u306e\u307b\u3093\u306e\u4e00\u4f8b\u3060\u304cSprout Method\u3092\u7d39\u4ecb\u3057\u3088\u3046\u3068\u601d\u3046\u3002<\/p>\n<p>Sprout Method\u306f\u3001\u30c6\u30b9\u30c8\u306e\u306a\u3044\u30ec\u30ac\u30b7\u30fc\u30b3\u30fc\u30c9\u306b\u8ffd\u52a0\u3067\u6a5f\u80fd\u958b\u767a\u3092\u3059\u308b\u969b\u306b\u3001\u65b0\u3057\u304f\u30c6\u30b9\u30c8\u6e08\u307f\u306e\u30b3\u30fc\u30c9\u3092\u5b9f\u88c5\u3057\u3066\u3001\u5f90\u3005\u306b\u30ab\u30d0\u30ec\u30c3\u30b8\u3092\u3075\u3084\u3057\u3066\u3044\u304f(\u30ec\u30ac\u30b7\u30fc\u30b3\u30fc\u30c9\u3092\u305d\u308c\u4ee5\u4e0a\u5897\u3084\u3055\u306a\u3044)\u5b9f\u88c5\u3067\u3042\u308b\u3002\u624b\u9806\u3068\u3057\u3066\u306f\u4ee5\u4e0b\u306e\u69d8\u306a\u3082\u306e\u3060\u3002<\/p>\n<ol>\n<li>\u3069\u3053\u3092\u5909\u66f4\u3059\u308b\u306e\u304b\u660e\u3089\u304b\u306b\u3059\u308b\u3002<\/li>\n<li>\u65e2\u5b58\u30bd\u30fc\u30b9\u306e\u4fee\u6b63\u3057\u305f\u3044\u7b87\u6240\u3092\u30b3\u30e1\u30f3\u30c8\u30a2\u30a6\u30c8\u3059\u308b(\u30b3\u30e1\u30f3\u30c8\u30a2\u30a6\u30c8\u3057\u3066\u304a\u304f\u3068\u3001\u958b\u767a\u4e2d\u306b\u3059\u3050\u306b\u623b\u308c\u308b\u70b9\u304c\u826f\u3044)\u3002<\/li>\n<li>\u5f15\u6570\u3084\u623b\u308a\u5024\u3092\u78ba\u8a8d\u3059\u308b\u3002<\/li>\n<li>TDD\u3092\u7528\u3044\u306a\u304c\u3089\u3001\u65b0\u3057\u304f\u5225\u306e\u5834\u6240\u306b\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u88c5\u3059\u308b\u3002<\/li>\n<li>\u30b3\u30e1\u30f3\u30c8\u30a2\u30a6\u30c8\u3057\u305f\u7b87\u6240\u3067\u3001\u65b0\u3057\u3044\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3059\u3088\u3046\u7f6e\u304d\u63db\u3048\u308b\u3002<\/li>\n<\/ol>\n<p>\u30e1\u30bd\u30c3\u30c9\u3060\u3051\u3067\u306a\u304f\u3001Sprout Class\u306e\u624b\u6cd5\u3082\u7d39\u4ecb\u3055\u308c\u3066\u3044\u305f\u3002\u3053\u306e\u3088\u3046\u306b\u3001\u65e2\u5b58\u306e\u30b3\u30fc\u30c9\u3092\u58ca\u3055\u305a\u306b\u65b0\u3057\u304f\u30c6\u30b9\u30c8\u3055\u308c\u305f\u30b3\u30fc\u30c9\u3092\u8ffd\u52a0\u3057\u3066\u3044\u304f\u306e\u304c\u672c\u66f8\u3067\u306f\u91cd\u8981\u3060\u3068\u3055\u308c\u3066\u3044\u305f\u3002<\/p>\n<h2 id=\"outline__7\" id=\"\u4f9d\u5b58\u95a2\u4fc2\u306e\u56f3\u5316\">\u4f9d\u5b58\u95a2\u4fc2\u306e\u56f3\u5316<\/h2>\n<p>\u30c6\u30b9\u30c8\u306e\u306a\u3044\u30b3\u30fc\u30c9\u3067\u306f\u3001\u6642\u306b\u4eba\u529b\u3067\u3001\u305d\u306e\u4f9d\u5b58\u95a2\u4fc2\u3084\u5f71\u97ff\u7bc4\u56f2\u3092\u8abf\u3079\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002\u305d\u306e\u305f\u3081\u306b\u3001\u4f9d\u5b58\u95a2\u4fc2\u3092\u56f3\u5316\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3068\u3055\u308c\u3066\u3044\u305f\u3002\u624b\u9806\u3068\u3057\u3066\u306f\u4ee5\u4e0b\u306e\u69d8\u306a\u3082\u306e\u3060\u3002\u3053\u306e\u4f9d\u5b58\u95a2\u4fc2\u306e\u6d17\u3044\u51fa\u3057\u306f\u3001\u4ed6\u306e\u624b\u6cd5\u306b\u3082\u591a\u3005\u5fdc\u7528\u3055\u308c\u3066\u3044\u308b\u3002<\/p>\n<ol>\n<li>\u5909\u66f4\u3092\u3042\u305f\u3048\u308b\u30e1\u30bd\u30c3\u30c9\u3092\u660e\u3089\u304b\u306b\u3059\u308b\u3002<\/li>\n<li>\u305d\u306e\u30e1\u30bd\u30c3\u30c9\u306b\u623b\u308a\u5024\u304c\u3042\u308b\u306e\u306a\u3089\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u547c\u3073\u51fa\u3057\u5148\u3082\u78ba\u8a8d\u3059\u308b\u3002<\/li>\n<li>\u30e1\u30bd\u30c3\u30c9\u304c\u5909\u66f4\u3059\u308b\u5024\u304c\u3072\u3068\u3064\u3067\u3082\u3042\u308c\u3070\u78ba\u8a8d\u3059\u308b\u3002\u305d\u306e\u5024\u3092\u4f7f\u7528\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u3001\u307e\u305f\u3001\u305d\u306e\u5148\u304c\u3042\u308c\u3070\u3055\u3089\u306b\u78ba\u8a8d\u3059\u308b\u3002<\/li>\n<li>\u30af\u30e9\u30b9\u306e\u7d99\u627f\u5143\u3084\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3082\u78ba\u8a8d\u3059\u308b\u3002<\/li>\n<li>\u30d1\u30e9\u30e1\u30fc\u30bf\u304c\u3069\u3053\u304b\u3089\u6765\u3066\u3044\u308b\u306e\u304b\u3092\u78ba\u8a8d\u3059\u308b\u3002<\/li>\n<li>\u30b0\u30ed\u30fc\u30d0\u30eb\u306a\u5024\u3084\u9759\u7684\u306a\u30c7\u30fc\u30bf\u304c\u5909\u66f4\u3055\u308c\u3066\u3044\u306a\u3044\u304b\u78ba\u8a8d\u3059\u308b\u3002<\/li>\n<\/ol>\n<h4 id=\"outline__7_1_1\" id=\"\u5f15\u7528-4\">\u5f15\u7528<\/h4>\n<blockquote>\n<ul>\n<li>How do we know that these are the right methods to use? In this case, the problem is simple. When we\u2019ve identified those as the points of change, we can start to sketch effects.<\/li>\n<li>Try to analyze effects in code whenever you get a chance.<\/li>\n<li>it\u2019s important to know what can be affected by the changes we are making.<\/li>\n<li>Extract Method is a core technique for working with legacy code. You can use it to extract duplication, separate responsibilities, and break down long methods.<\/li>\n<\/ul>\n<\/blockquote>\n<h2 id=\"outline__8\" id=\"\u3061\u3087\u3063\u3068\u3044\u3044\u8a71\">\u3061\u3087\u3063\u3068\u3044\u3044\u8a71<\/h2>\n<h3 id=\"outline__8_1\" id=\"\u5f15\u7528-5\">\u5f15\u7528<\/h3>\n<blockquote>\n<ul>\n<li>For some people, it is a paycheck, and there isn\u2019t anything wrong with that\u2014we all have to make a living. But there really ought to be some other reason why you are programming.<\/li>\n<li>it really doesn\u2019t matter what kind of system you are working on. You can do neat things with it.<\/li>\n<li>The key to thriving in legacy code is finding what motivates you.<\/li>\n<li>TDD some code outside of work. Program for fun a little bit. Start to feel the difference between the<\/li>\n<\/ul>\n<\/blockquote>\n<h2 id=\"outline__9\" id=\"\u307e\u3068\u3081\">\u307e\u3068\u3081<\/h2>\n<p>\u5c11\u3005\u30b9\u30c8\u30ec\u30fc\u30c8\u3059\u304e\u308b\u8a00\u3044\u56de\u3057\u304c\u591a\u3044\u3068\u611f\u3058\u305f\u304c\u3001\u305d\u306e\u5206\u30e2\u30c1\u30d9\u30fc\u30b7\u30e7\u30f3\u306f\u3042\u304c\u308b\u3057\u3001\u52c9\u5f37\u306b\u306a\u308b\u70b9\u3001\u4eca\u5f8c\u53d6\u308a\u5165\u308c\u3066\u3044\u304d\u305f\u3044\u70b9\u3082\u975e\u5e38\u306b\u591a\u3044\u66f8\u7c4d\u3060\u3063\u305f\u3002Java\u3084C++\u3067\u306e\u30b5\u30f3\u30d7\u30eb\u3082\u3044\u3044\u52c9\u5f37\u306b\u306a\u3063\u305f(\u9762\u767d\u304b\u3063\u305f)\u3068\u601d\u3046\u3002\u65e2\u5b58\u306e\u30ec\u30ac\u30b7\u30fc\u30b3\u30fc\u30c9\u3078\u306e\u5411\u304d\u5408\u3044\u65b9\u3060\u3051\u3067\u306a\u304f\u3001\u3069\u3046\u3059\u308c\u3070\u30ec\u30ac\u30b7\u30fc\u30b3\u30fc\u30c9\u306b\u306a\u3089\u306a\u3044\u304b\u3001\u7dba\u9e97\u306a\u30b3\u30fc\u30c9\u3092\u4fdd\u3066\u308b\u304b\u3068\u3044\u3046\u5074\u9762\u3082\u5927\u304d\u3044\u306e\u3067\u3001\u76f4\u8fd1\u3067\u30ec\u30ac\u30b7\u30fc\u30b3\u30fc\u30c9\u958b\u767a\u6848\u4ef6\u304c\u306a\u3044\u4eba\u306b\u3082\u30aa\u30b9\u30b9\u30e1\u3060\u3068\u601d\u3063\u305f\u3002<\/p>\n<p>\u4ee5\u4e0a\u3001\u30ec\u30ac\u30b7\u30fc\u30b3\u30fc\u30c9\u6539\u5584\u30ac\u30a4\u30c9\u306e\u5185\u5bb9\u30e1\u30e2\u3067\u3057\u305f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5148\u6708\u3042\u305f\u308a\u306b\u8aad\u3093\u3060\u30ec\u30ac\u30b7\u30fc\u30b3\u30fc\u30c9\u6539\u5584\u30ac\u30a4\u30c9\u304c\u9762\u767d\u304b\u3063\u305f\u306e\u3067\u3001\u305d\u306e\u5185\u5bb9\u3092\u30e1\u30e2\u3057\u3066\u307f\u308b\u3002\u69d8\u3005\u306a\u30c6\u30af\u30cb\u30c3\u30af\u304c\u7d39\u4ecb\u3055\u308c\u3066\u3044\u305f\u304c\u3001\u305d\u308c\u3092\u3072\u3068\u3064\u3072\u3068\u3064\u66f8\u3044\u3066\u3044\u308b\u3068\u9577\u304f\u306a\u3063\u3066\u3057\u307e\u3046\u306e\u3067\u3001\u6982\u8981\u3084\u30b3\u30f3\u30bb\u30d7\u30c8\u3092\u30e1\u30a4\u30f3\u306b\u66f8\u3053\u3046\u3068\u601d\u3046\u3002 Amazon.co.jp: \u30ec\u30ac\u30b7\u30fc\u30b3\u30fc\u30c9\u6539\u5584\u30ac\u30a4\u30c9 \u30ec\u30ac\u30b7\u30fc\u30b3\u30fc\u30c9\u306e\u5909\u66f4\u624b\u9806 \u30ec\u30ac\u30b7\u30fc\u30b3\u30fc\u30c9\u306e\u5909\u66f4\u624b\u9806\u306f\u4ee5\u4e0b\u306e\u69d8\u306a\u3082\u306e\u3060\u3002\u3053\u308c\u3092\u57fa\u672c\u3068\u3057\u3066\u3001\u69d8\u3005\u306a\u624b\u6cd5\u3084\u4f8b\u3092\u4ea4\u3048\u3066\u3001\u7ae0\u304c\u9032\u3093\u3067\u3044\u304f\u3002 \u5909 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":684,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[7],"tags":[166],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/p-corporate-blog-cms.mmmcorp.co.jp\/wp-json\/wp\/v2\/posts\/314"}],"collection":[{"href":"https:\/\/p-corporate-blog-cms.mmmcorp.co.jp\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/p-corporate-blog-cms.mmmcorp.co.jp\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/p-corporate-blog-cms.mmmcorp.co.jp\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/p-corporate-blog-cms.mmmcorp.co.jp\/wp-json\/wp\/v2\/comments?post=314"}],"version-history":[{"count":1,"href":"https:\/\/p-corporate-blog-cms.mmmcorp.co.jp\/wp-json\/wp\/v2\/posts\/314\/revisions"}],"predecessor-version":[{"id":3465,"href":"https:\/\/p-corporate-blog-cms.mmmcorp.co.jp\/wp-json\/wp\/v2\/posts\/314\/revisions\/3465"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/p-corporate-blog-cms.mmmcorp.co.jp\/wp-json\/"}],"wp:attachment":[{"href":"https:\/\/p-corporate-blog-cms.mmmcorp.co.jp\/wp-json\/wp\/v2\/media?parent=314"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/p-corporate-blog-cms.mmmcorp.co.jp\/wp-json\/wp\/v2\/categories?post=314"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/p-corporate-blog-cms.mmmcorp.co.jp\/wp-json\/wp\/v2\/tags?post=314"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}