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| author | muqiuhan <[email protected]> | 2025-05-03 10:47:05 +0000 |
|---|---|---|
| committer | muqiuhan <[email protected]> | 2025-05-03 10:47:05 +0000 |
| commit | 3fa50e79f12fe2b66ebd5d643ed597c6a121b198 (patch) | |
| tree | 75dee536b39669352e6c8dd78c01c4e65899fd0e /2023/04/30 | |
| parent | 9d7184b4ef8be81a9c6b7c7c5f21fff94e0ea23a (diff) | |
| download | blog-3fa50e79f12fe2b66ebd5d643ed597c6a121b198.tar.gz | |
deploy: a0dad147ccf1d831c5f48d8d0e868160a23cc92c
Diffstat (limited to '2023/04/30')
| -rw-r--r-- | 2023/04/30/TypeScript-With-Rust-Errors-No-Try-Catch-Heresy/index.html | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/2023/04/30/TypeScript-With-Rust-Errors-No-Try-Catch-Heresy/index.html b/2023/04/30/TypeScript-With-Rust-Errors-No-Try-Catch-Heresy/index.html index 0078f582..cd2af748 100644 --- a/2023/04/30/TypeScript-With-Rust-Errors-No-Try-Catch-Heresy/index.html +++ b/2023/04/30/TypeScript-With-Rust-Errors-No-Try-Catch-Heresy/index.html @@ -215,7 +215,7 @@ <figure class="highlight typescript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">export</span> <span class="keyword">type</span> <span class="title class_">Safe</span><T> = </span><br><span class="line"> | { </span><br><span class="line"> <span class="attr">success</span>: <span class="literal">true</span>; </span><br><span class="line"> <span class="attr">data</span>: T; </span><br><span class="line"> } </span><br><span class="line"> | { </span><br><span class="line"> <span class="attr">success</span>: <span class="literal">false</span>; </span><br><span class="line"> <span class="attr">error</span>: <span class="built_in">string</span>; </span><br><span class="line"> };</span><br></pre></td></tr></table></figure> <p>we do need a few try/catches. The good thing is we only need about two, not 100,000:</p> -<figure class="highlight typescript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">export</span> <span class="keyword">function</span> safe<T>(<span class="attr">promise</span>: <span class="title class_">Promise</span><T>, err?: <span class="built_in">string</span>): <span class="title class_">Promise</span><<span class="title class_">Safe</span><T>>;</span><br><span class="line"><span class="keyword">export</span> <span class="keyword">function</span> safe<T>(<span class="attr">func</span>: <span class="function">() =></span> T, err?: <span class="built_in">string</span>): <span class="title class_">Safe</span><T>;</span><br><span class="line"><span class="keyword">export</span> <span class="keyword">function</span> safe<T>(</span><br><span class="line"> <span class="attr">promiseOrFunc</span>: <span class="title class_">Promise</span><T> | (<span class="function">() =></span> T),</span><br><span class="line"> err?: <span class="built_in">string</span>,</span><br><span class="line">): <span class="title class_">Promise</span><<span class="title class_">Safe</span><T>> | <span class="title class_">Safe</span><T> {</span><br><span class="line"> <span class="keyword">if</span> (promiseOrFunc <span class="keyword">instanceof</span> <span class="title class_">Promise</span>) {</span><br><span class="line"> <span class="keyword">return</span> <span class="title function_">safeAsync</span>(promiseOrFunc, err);</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> <span class="title function_">safeSync</span>(promiseOrFunc, err);</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="keyword">async</span> <span class="keyword">function</span> safeAsync<T>(</span><br><span class="line"> <span class="attr">promise</span>: <span class="title class_">Promise</span><T>, </span><br><span class="line"> err?: <span class="built_in">string</span></span><br><span class="line">): <span class="title class_">Promise</span><<span class="title class_">Safe</span><T>> {</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> <span class="keyword">const</span> data = <span class="keyword">await</span> promise;</span><br><span class="line"> <span class="keyword">return</span> { data, <span class="attr">success</span>: <span class="literal">true</span> };</span><br><span class="line"> } <span class="keyword">catch</span> (e) {</span><br><span class="line"> <span class="variable language_">console</span>.<span class="title function_">error</span>(e);</span><br><span class="line"> <span class="keyword">if</span> (err !== <span class="literal">undefined</span>) {</span><br><span class="line"> <span class="keyword">return</span> { <span class="attr">success</span>: <span class="literal">false</span>, <span class="attr">error</span>: err };</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">if</span> (e <span class="keyword">instanceof</span> <span class="title class_">Error</span>) {</span><br><span class="line"> <span class="keyword">return</span> { <span class="attr">success</span>: <span class="literal">false</span>, <span class="attr">error</span>: e.<span class="property">message</span> };</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> { <span class="attr">success</span>: <span class="literal">false</span>, <span class="attr">error</span>: <span class="string">"Something went wrong"</span> };</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="keyword">function</span> safeSync<T>(</span><br><span class="line"> <span class="attr">func</span>: <span class="function">() =></span> T, </span><br><span class="line"> err?: <span class="built_in">string</span></span><br><span class="line">): <span class="title class_">Safe</span><T> {</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> <span class="keyword">const</span> data = <span class="title function_">func</span>();</span><br><span class="line"> <span class="keyword">return</span> { data, <span class="attr">success</span>: <span class="literal">true</span> };</span><br><span class="line"> } <span class="keyword">catch</span> (e) {</span><br><span class="line"> <span class="variable language_">console</span>.<span class="title function_">error</span>(e);</span><br><span class="line"> <span class="keyword">if</span> (err !== <span class="literal">undefined</span>) {</span><br><span class="line"> <span class="keyword">return</span> { <span class="attr">success</span>: <span class="literal">false</span>, <span class="attr">error</span>: err };</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">if</span> (e <span class="keyword">instanceof</span> <span class="title class_">Error</span>) {</span><br><span class="line"> <span class="keyword">return</span> { <span class="attr">success</span>: <span class="literal">false</span>, <span class="attr">error</span>: e.<span class="property">message</span> };</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> { <span class="attr">success</span>: <span class="literal">false</span>, <span class="attr">error</span>: <span class="string">"Something went wrong"</span> };</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure> +<figure class="highlight typescript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">export</span> <span class="keyword">function</span> safe<T>(<span class="attr">promise</span>: <span class="title class_">Promise</span><T>, <span class="attr">err</span>?: <span class="built_in">string</span>): <span class="title class_">Promise</span><<span class="title class_">Safe</span><T>>;</span><br><span class="line"><span class="keyword">export</span> <span class="keyword">function</span> safe<T>(<span class="attr">func</span>: <span class="function">() =></span> T, <span class="attr">err</span>?: <span class="built_in">string</span>): <span class="title class_">Safe</span><T>;</span><br><span class="line"><span class="keyword">export</span> <span class="keyword">function</span> safe<T>(</span><br><span class="line"> <span class="attr">promiseOrFunc</span>: <span class="title class_">Promise</span><T> | (<span class="function">() =></span> T),</span><br><span class="line"> <span class="attr">err</span>?: <span class="built_in">string</span>,</span><br><span class="line">): <span class="title class_">Promise</span><<span class="title class_">Safe</span><T>> | <span class="title class_">Safe</span><T> {</span><br><span class="line"> <span class="keyword">if</span> (promiseOrFunc <span class="keyword">instanceof</span> <span class="title class_">Promise</span>) {</span><br><span class="line"> <span class="keyword">return</span> <span class="title function_">safeAsync</span>(promiseOrFunc, err);</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> <span class="title function_">safeSync</span>(promiseOrFunc, err);</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="keyword">async</span> <span class="keyword">function</span> safeAsync<T>(</span><br><span class="line"> <span class="attr">promise</span>: <span class="title class_">Promise</span><T>, </span><br><span class="line"> <span class="attr">err</span>?: <span class="built_in">string</span></span><br><span class="line">): <span class="title class_">Promise</span><<span class="title class_">Safe</span><T>> {</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> <span class="keyword">const</span> data = <span class="keyword">await</span> promise;</span><br><span class="line"> <span class="keyword">return</span> { data, <span class="attr">success</span>: <span class="literal">true</span> };</span><br><span class="line"> } <span class="keyword">catch</span> (e) {</span><br><span class="line"> <span class="variable language_">console</span>.<span class="title function_">error</span>(e);</span><br><span class="line"> <span class="keyword">if</span> (err !== <span class="literal">undefined</span>) {</span><br><span class="line"> <span class="keyword">return</span> { <span class="attr">success</span>: <span class="literal">false</span>, <span class="attr">error</span>: err };</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">if</span> (e <span class="keyword">instanceof</span> <span class="title class_">Error</span>) {</span><br><span class="line"> <span class="keyword">return</span> { <span class="attr">success</span>: <span class="literal">false</span>, <span class="attr">error</span>: e.<span class="property">message</span> };</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> { <span class="attr">success</span>: <span class="literal">false</span>, <span class="attr">error</span>: <span class="string">"Something went wrong"</span> };</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="keyword">function</span> safeSync<T>(</span><br><span class="line"> <span class="attr">func</span>: <span class="function">() =></span> T, </span><br><span class="line"> <span class="attr">err</span>?: <span class="built_in">string</span></span><br><span class="line">): <span class="title class_">Safe</span><T> {</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> <span class="keyword">const</span> data = <span class="title function_">func</span>();</span><br><span class="line"> <span class="keyword">return</span> { data, <span class="attr">success</span>: <span class="literal">true</span> };</span><br><span class="line"> } <span class="keyword">catch</span> (e) {</span><br><span class="line"> <span class="variable language_">console</span>.<span class="title function_">error</span>(e);</span><br><span class="line"> <span class="keyword">if</span> (err !== <span class="literal">undefined</span>) {</span><br><span class="line"> <span class="keyword">return</span> { <span class="attr">success</span>: <span class="literal">false</span>, <span class="attr">error</span>: err };</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">if</span> (e <span class="keyword">instanceof</span> <span class="title class_">Error</span>) {</span><br><span class="line"> <span class="keyword">return</span> { <span class="attr">success</span>: <span class="literal">false</span>, <span class="attr">error</span>: e.<span class="property">message</span> };</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> { <span class="attr">success</span>: <span class="literal">false</span>, <span class="attr">error</span>: <span class="string">"Something went wrong"</span> };</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure> <p>This is just a wrapper with our <code>Safe</code> type as the return one. But sometimes simple things are all you need. Let’s combine them with the example from above.</p> <figure class="highlight typescript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">const</span> request = { <span class="attr">name</span>: “test”, <span class="attr">value</span>: <span class="number">2n</span> }; </span><br><span class="line"><span class="keyword">const</span> body = <span class="title function_">safe</span>( </span><br><span class="line"> <span class="function">() =></span> <span class="title class_">JSON</span>.<span class="title function_">stringify</span>(request), </span><br><span class="line"> “<span class="title class_">Failed</span> to serialize request”, </span><br><span class="line">); </span><br><span class="line"><span class="keyword">if</span> (!body.<span class="property">success</span>) { </span><br><span class="line"> <span class="comment">// handle error (body.error) </span></span><br><span class="line"> <span class="keyword">return</span>; </span><br><span class="line">} </span><br><span class="line"><span class="keyword">const</span> response = <span class="keyword">await</span> <span class="title function_">safe</span>( </span><br><span class="line"> <span class="title function_">fetch</span>(<span class="string">"https://example.com"</span>, { </span><br><span class="line"> <span class="attr">method</span>: “<span class="variable constant_">POST</span>”, </span><br><span class="line"> <span class="attr">body</span>: body.<span class="property">data</span>, </span><br><span class="line"> }), </span><br><span class="line">); </span><br><span class="line"><span class="keyword">if</span> (!response.<span class="property">success</span>) { </span><br><span class="line"> <span class="comment">// handle error (response.error) </span></span><br><span class="line"> <span class="keyword">return</span>; </span><br><span class="line">} </span><br><span class="line"><span class="keyword">if</span> (!response.<span class="property">data</span>.<span class="property">ok</span>) { </span><br><span class="line"> <span class="comment">// handle network error </span></span><br><span class="line"> <span class="keyword">return</span>; </span><br><span class="line">} </span><br><span class="line"><span class="comment">// handle response (body.data)</span></span><br></pre></td></tr></table></figure> |