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124 lines
4.9 KiB
124 lines
4.9 KiB
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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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<h1 class="post-title">Things I Learnt The Hard Way - Not Just Function Composition, But Application Composition</h1> |
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<span class="post-date"> |
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2019-07-15 |
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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/composition/">#composition</a> |
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<a href="https://blog.juliobiason.me/tags/applications/">#applications</a> |
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<p>When we were discussing <a href="/books/things-i-learnt/magical-number-seven">the magical number |
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seven</a>, I mentioned that it made |
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more sense to actually call the functions in sequence instead of each calling |
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the next. That's basically a "function composition", one thing you can also do |
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with your applications.</p> |
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<span id="continue-reading"></span> |
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<p>Unix came with the idea of "applications that do one thing and do it well". |
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And then you could just pick the output of one application and plug it as |
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input of another (and then plug the output of the second into a third, and so |
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on).</p> |
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<p>Also, I mentioned that you could use <a href="/books/things-i-learnt/config-file">configuration |
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files</a> to do the same processing over |
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different source elements (based on a configuration, that is) instead of |
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writing an application that would process both in a single shot.</p> |
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<p>One problem with that approach is that you may need <em>both</em> results to actually |
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produce a usable result (for example, how would you build a list of common |
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followings of two Twitter users if you don't have both lists?).</p> |
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<p>That problem can easily be solved if you write a different application that |
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just receives both lists and compare them. That would greatly simplify your |
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general codebase 'cause instead of one massive codebase with lots of moving |
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pieces, you'd have two small codebases, with less moving pieces. One could |
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still break the other -- say, if you or someone else changes the result of the |
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first function -- but you will still get the results of the first without |
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missing the whole 'cause the second is breaking.</p> |
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<p>PS: I reckon it's really hard to create application composition with graphical |
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applications (why would you ask your user to have <em>two</em> applications open at |
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the same time to make something work?) but you can extrapolate this for almost |
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everything else.</p> |
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<div style="float:left"> |
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<< <a href="/books/things-i-learnt/command-line-options">Command Line Options Are Weird, But Helpful</a> |
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<a href="/books/things-i-learnt/app-composition-stupid">Even for Application Composition, Start Stupid</a> >> |
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