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Koa與Socket實作
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<p>最近快要畢業了，想要找個公司能夠有個能讓好好充實自己的地方，但是有兵役問題，很多公司無法接受，也有投一些實習，可是也都沒有上，就突然有感而發覺得似乎是自己能力太不足夠，所以我一定要再更奮發向上！廢話不多說，我們來進入主題～</p>
<p>昨天在聽讀書會的時候，主題是node design pattern，強調使用Stream來作分流、分支，後來就突然想到之前一直很想學如何做一個聊天室，所以就慢慢的實作，就把實踐的過程中一步一步記錄下來。</p>
<h2 id="起手式"><a href="#起手式" class="headerlink" title="起手式"></a>起手式</h2><p>這個實作會比較簡單，就是簡單地利用Koa建立小型的伺服器，並且導入Koa-Router可以來處理路由，這個範例沒有做的很精細，只是稍微簡單的實作而已，假如需要更完整的功能可以去看<a href="https://socket.io/docs/" target="_blank" rel="external">官方文件</a>，上面的功能有更詳細得解說。</p>
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Dcard Web Intern 題目 - Rate Limiter
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<p>題目如下</p>
<hr>
<p>Dcard 每天午夜都有大量使用者湧入抽卡,為了不讓伺服器過載,請設計一個 middleware:</p>
<ul>
<li>限制每小時來自同一個 IP 的請求數量不得超過 1000</li>
<li>在 response headers 中加入剩餘的請求數量 (X-RateLimit-Remaining) 以及 rate limit</li>
<li>歸零的時間 (X-RateLimit-Reset)</li>
<li>如果超過限制的話就回傳 429 (Too Many Requests)</li>
<li>可以使用各種資料庫達成</li>
</ul>
<hr>
<p>這題我是使用Koa@2來實作，順便當作練習Koa，之前雖然寫過ExpressJS，但是Koa跟Express有點不太一樣，可是轉換起來應該還是可以無縫接軌！</p>
<h2 id="起手式"><a href="#起手式" class="headerlink" title="起手式"></a>起手式</h2><p>首先就先簡單的引入yarn(npm)來安裝koa！我是用yarn，所以下面範例都是用yarn來當做範例！</p>
<p>整個middleware流程大概是<br>routing -> get ip -> query database -> return res and set headers<br> ==> null -> add a new data row<br> ==> validity period -> update data<br> ==> expired -> update<br> ==> validity period && too many req-> reject request</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div></pre></td><td class="code"><pre><div class="line">take middleware</div><div class="line"><span class="comment"># take = (mkdir middleware & cd middleware)</span></div><div class="line">yarn init</div></pre></td></tr></table></figure>
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Dcard Web Intern 題目 - Card
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<p>突然有一天看到Dcard有在徵暑假實習生，往下滑一滑居然看到要寫小作業，看了看題目覺得還蠻有趣的，就慢慢寫了幾題，裡面有前端也有後端，最後一題還是演算法，看都看不懂所以果斷放棄哈哈！</p>
<p>這是第二題，題目是在說有6種情況（類似撲克牌，因為題目沒有寫得很清楚，所以不知道有沒有花色大小問題，我下面是忽略花色大小，只計算點數）</p>
<ul>
<li>（同花順）Straight flush (five cards in sequence, all of the same suit)</li>
<li>（鐵支）Four of a kind (four cards of one rank and any other (unmatched) card)</li>
<li>（葫蘆）Full house (three matching cards of one rank and two matching cards of another rank)</li>
<li>（同花）Flush (five cards are of the same suit, but not in sequence)</li>
<li>（順子）Straight (five cards of sequential rank in at least two different suits)</li>
<li>（單隻）any unmatched card</li>
</ul>
<h2 id="起手式"><a href="#起手式" class="headerlink" title="起手式"></a>起手式</h2><p>因為是小作業，順便練練手感，所以嘗試使用TDD，所以會先寫測試，再來寫Code。<br>一開始先建立mock data，再開始寫測試。</p>
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JavaScript 設計模型 - Iterator
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<p>Iterator Pattern是一個很重要也很簡單的Pattern：迭代器！<br>我們可以提供一個統一入口的迭代器，Client只需要知道有哪些方法，或是有哪些Concrete Iterator，並不需要知道他們底層如何實作！現在就讓我們來開始吧！</p>
<h3 id="起手式"><a href="#起手式" class="headerlink" title="起手式"></a>起手式</h3><p>Iterator最主要的東西就是兩個：hasNext、next。要讓Client知道是否還有下一個，和切換到下一個！<br>
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JavaScript 設計模型 - Composite
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<p>原本是想要寫Decorator，但是發現他有點Composite Pattern的基礎，所以就想說先寫這個Pattern！<br>這個Pattern，可以使我們的Code能夠更組件化！能夠大大提升組件的覆用性，現在許多的前端框架也主打擁有Component，就像是樂高積木一樣，組起來就好！</p>
<h2 id="起手式"><a href="#起手式" class="headerlink" title="起手式"></a>起手式</h2><p>『Composition over inheritance』雖然這句話是在物件導向比較適用，因為JS是FP不是OO阿！但是我們還是希望寫出覆用性高、耦合低和可維護性的Code，所以我們可以借鏡一下！</p>
<p>這個Pattern可以把他想像成資料夾與檔案的關係，檔案是Primitive Component、資料夾是Composite Component，資料夾裡面可以有檔案也可以有另外一個資料夾！有點『詩中有畫，畫中有詩』的感覺</p>
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