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<h2>Define and Use Hackage</h2>
<p>By Jaiyalas - 17 Oct 2015</p>
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<p>一個 haskell package 的版本號是有明確意義而不是隨便亂取的數字開心就好的。 到底這些數字個別有什麼意思？不同的數字間又代表了什麼差異？接下來我們會簡單介紹一下， 希望對於有心開發 hackage 的人會有幫助。</p>
<p>此外，我們說一個 <code>instance C T</code> 是一個孤兒 (<em>orphan instance</em>) 是指這個 instance 既不是和 <code>data T</code> 一起被定義在同一個 module 中，也不是和 <code>class C</code> 一起被定義在同一個 module 中。這樣的 instance 會產生一些 importing 上面的問題，也因此這個議題對於開發 hackage 的人來說是值得了解的。</p>
<p><a href="./content/posts/2015-10-17-hackage.html" class="readmore">... read more</a></p>
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<h2>Working with Contravariant Functors.</h2>
<p>By Jaiyalas - 03 Aug 2015</p>
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<p>In category, a contravariant functor is not thing but a functor with reversed output. For example, given type <code>a</code>, <code>b</code> in category <code>C</code> and a morphism <code>f :: a -> b</code>, a functor <code>CF</code> is a contravariant functor if <code>CF f</code> has type as <code>CF b -> CF a</code></p>
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<h2>For old time's sake.</h2>
<p>By Jaiyalas - 29 May 2015</p>
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<p>Today we will have a short overview of old data-/time-related packages listed as follows:</p>
<ul>
<li><a href="https://hackage.haskell.org/package/old-time">old-time</a></li>
<li><a href="http://hackage.haskell.org/package/time-compat">time-compat</a></li>
<li><a href="https://hackage.haskell.org/package/old-locale">old-locale</a></li>
<li><a href="http://hackage.haskell.org/package/time-locale-compat">time-locale-compat</a> <a href="#fn1" class="footnoteRef" id="fnref1"><sup>1</sup></a></li>
</ul>
<p>Those modules are very easily to use but have some shortcomings. The <strong>old-time</strong>(<code>System.Time</code>) has poor supporting on locale and formating and lack functions to manipulate times. And the <code>TimeDiff</code> is not very sueful. The <strong>old-locale</strong>(<code>System.Locale</code>), however, is not very out-dated.</p>
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