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116 lines
4.2 KiB
116 lines
4.2 KiB
11 months ago
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<!DOCTYPE html>
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<html lang="en">
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1, viewport-fit=cover">
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<title>Julio Biason .Me 4.3</title>
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<link rel="stylesheet" href="https://blog.juliobiason.me/print.css" media="print">
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</head>
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<body class=" ">
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<div class="sidebar">
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<div class="container sidebar-sticky">
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<div class="sidebar-about">
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<a href="https://blog.juliobiason.me"><h1>Julio Biason .Me 4.3</h1></a>
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<p class="lead">Old school dev living in a 2.0 dev world</p>
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</div>
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<ul class="sidebar-nav">
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<li class="sidebar-nav-item"><a href="/">English</a></li>
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<li class="sidebar-nav-item"><a href="/pt">Português</a></li>
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<li class="sidebar-nav-item"><a href="/tags">Tags (EN)</a></li>
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<li class="sidebar-nav-item"><a href="/pt/tags">Tags (PT)</a></li>
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</ul>
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<div class="content container">
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<div class="post">
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<h1 class="post-title">Things I Learnt The Hard Way - Beware of Interface Changes</h1>
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<span class="post-date">
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2019-06-23
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<a href="https://blog.juliobiason.me/tags/books/">#books</a>
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<a href="https://blog.juliobiason.me/tags/things-i-learnt/">#things i learnt</a>
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<a href="https://blog.juliobiason.me/tags/interfaces/">#interfaces</a>
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<a href="https://blog.juliobiason.me/tags/apis/">#apis</a>
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</span>
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<p>Interfaces and APIs is what you give away to others. If you keep changing them,
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you'll make everyone's life sad.</p>
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<span id="continue-reading"></span>
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<p>When talking about <a href="/books/things-i-learnt/boolean-parameters">boolean
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parameters</a>, I mentioned about
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renaming the function. If you control the whole source where the function is
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used, that's not issue, it's just a matter of search and replace.</p>
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<p>But if that function was actually exposed in a library, you shouldn't change
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function names in a whim. That will break a lot of other applications beyond
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your control and make a lot of other people unhappy.</p>
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<p>Remember, when you write <a href="/books/things-i-learnt/tests-apis">tests for APIs</a>,
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you can see these kind of changes happening and you can see the kind of
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changes you're doing on how they reflect externally.</p>
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<p>You can create the new functions and mark the current one as deprecated,
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either by documentation or by some code feature. Then, after a few releases,
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you can finally kill the original function.</p>
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<p>(A dickish move you can do is to create the new functions, mark the current
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function as deprecated and <em>add a sleep at the start of the function</em>, in a
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way that people using the old function are forced to update.)</p>
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<div>
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<div style="float:left">
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<< <a href="/books/things-i-learnt/boolean-parameters">Don't Use Booleans As Parameters</a>
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</div>
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<div style="float:right">
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<a href="/books/things-i-learnt/crash-it">It's Better To Let The Application Crash Than Do Nothing</a> >>
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</div>
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</div>
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</div>
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</div>
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</body>
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</html>
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