{"tag":{"id":"569d22c892921b8f79d35f68","name":"Software Engineering","logo":null,"slug":"software-engineering","tagline":"","__typename":"Tag"},"publication":{"__typename":"Publication","id":"5f456da96d1d6b1abbc3e80b","url":"https://maximilianocontieri.com","canonicalURL":"https://maximilianocontieri.com","urlPattern":"SIMPLE","title":"Maximiliano Contieri - Software Design","displayTitle":"","hasBadges":true,"descriptionSEO":"I am Maximiliano Contieri\nI've been working as a software engineer and teaching for about 25 years.\nI write about software design, refactoring, test driven development, clean code and code smells.","about":{"html":"

Learn something new every day. 💻\nCS software engineer\n👷working\n👨🏽‍🏫teaching\n✍🏾writing\n🎨Software design\n🏢SOLID\n🌉TDD\n👴Legacy

Write me at info(at)maximilianocontieri.com

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Technical Opinions are my own. I don't have the revealed truth.

Software Design is a creative activity. These are hints and not rigid rules.

I write on BackEnd Business Systems and OOP Design. My advice/experience might not suit other systems.

You can write me at info(at)maximilianocontieri.com

https://maximilianocontieri.com/i-wrote-more-than-90-articles-on-2021-here-is-what-i-learned

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Exposing internals is a major problem","brief":"TL;DR: Don't expose your internals and lose control\n\nProblems\n\nMutability\n\nUnexpected Changes\n\nRipple Effects\n\nThread unsafety\n\nEncapsulation Principle violation\n\n\nSolutions\n\nReturn shallow copies of your collections\n\nContext\nImmutable objects are es...","readTimeInMinutes":2,"views":28,"author":{"__typename":"User","id":"5f456a23b9870f18f59a8793","username":"mcsee","name":"Maxi Contieri","profilePicture":"https://cdn.hashnode.com/res/hashnode/image/upload/v1690339610314/hjEsqceL_.png","followersCount":4723},"coverImage":{"__typename":"PostCoverImage","url":"https://cdn.hashnode.com/res/hashnode/image/stock/unsplash/VMKBFR6r_jg/upload/af61bd101b9881eaa3999814d4a82d63.jpeg","isPortrait":false,"isAttributionHidden":false}},"cursor":"NjY4MDhlODU4NWZiM2IzMGFiN2Q3NDY2XzIwMjQtMDYtMjlUMjI6NDU6MjUuMDcwWg==","__typename":"PostEdge"},{"node":{"__typename":"Post","id":"6647e5a5394f76246a8526c6","title":"Code Smell 252 - NullCustomer","slug":"code-smell-252-nullcustomer","publishedAt":"2024-05-17T23:17:57.102Z","cuid":"clwbavjzi000209lafxo7dxq7","url":"https://maximilianocontieri.com/code-smell-252-nullcustomer","subtitle":"You love Null Object Design Patter because it avoids the billion-dollar mistake","brief":"TL;DR: Prefer real domain names to Implementation names\n\nProblems\n\nBijection Fault\n\nNaming\n\n\nSolutions\n\nSearch for a real-world metaphor\n\nContext\nNaming is essential when designing software.\nUsing Pattern Names is a common software problem where prog...","readTimeInMinutes":2,"views":31,"author":{"__typename":"User","id":"5f456a23b9870f18f59a8793","username":"mcsee","name":"Maxi Contieri","profilePicture":"https://cdn.hashnode.com/res/hashnode/image/upload/v1690339610314/hjEsqceL_.png","followersCount":4723},"coverImage":{"__typename":"PostCoverImage","url":"https://cdn.hashnode.com/res/hashnode/image/stock/unsplash/2-eCuma3qO0/upload/caff471eb903acd780ccc4e08d3c950e.jpeg","isPortrait":false,"isAttributionHidden":false}},"cursor":"NjY0N2U1YTUzOTRmNzYyNDZhODUyNmM2XzIwMjQtMDUtMTdUMjM6MTc6NTcuMTAyWg==","__typename":"PostEdge"},{"node":{"__typename":"Post","id":"663ff46f336d2895f4b74de6","title":"Code Smell 251 - Collections Empty","slug":"code-smell-251-collections-empty","publishedAt":"2024-05-11T22:42:55.405Z","cuid":"clw2ozeb100050al85bjh3ktd","url":"https://maximilianocontieri.com/code-smell-251-collections-empty","subtitle":"Do you want to count collections or know if they are empty?","brief":"TL;DR: Use declarative names. Always\n\nProblems\n\nReadability\n\nCache Invalidation\n\nPerformance Penalties\n\nType Safety\n\n\nSolutions\n\nReplace count() == 0 and size()==0 usages\n\nContext\nisEmpty() and count()==0 seem to be equivalent but have deep differenc...","readTimeInMinutes":3,"views":64,"author":{"__typename":"User","id":"5f456a23b9870f18f59a8793","username":"mcsee","name":"Maxi Contieri","profilePicture":"https://cdn.hashnode.com/res/hashnode/image/upload/v1690339610314/hjEsqceL_.png","followersCount":4723},"coverImage":{"__typename":"PostCoverImage","url":"https://cdn.hashnode.com/res/hashnode/image/stock/unsplash/jNSJE8dMro0/upload/58d9eff7e5214f022e62f35f203ff3a7.jpeg","isPortrait":false,"isAttributionHidden":false}},"cursor":"NjYzZmY0NmYzMzZkMjg5NWY0Yjc0ZGU2XzIwMjQtMDUtMTFUMjI6NDI6NTUuNDA1Wg==","__typename":"PostEdge"},{"node":{"__typename":"Post","id":"6632badfa117b416f84c93bf","title":"Code Smell 250 - Premature Memoization","slug":"code-smell-250-premature-memoization","publishedAt":"2024-05-01T21:57:51.119Z","cuid":"clvocywzz000009jta32200wh","url":"https://maximilianocontieri.com/code-smell-250-premature-memoization","subtitle":"Memoization is awesome. 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