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30secondsofcode
2018-05-02 17:21:29 +00:00
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@ -124,12 +124,12 @@ console<span class="token punctuation">.</span><span class="token function">log<
<span class="token number">0</span>
<span class="token punctuation">)
);</span>
</pre><label class="collapse">Show examples</label><pre class="language-js"><span class="token function">hashNode</span><span class="token punctuation">(</span>JSON<span class="token punctuation">.</span><span class="token function">stringify</span><span class="token punctuation">({</span> a<span class="token punctuation">:</span> <span class="token string">'a'</span><span class="token punctuation">,</span> b<span class="token punctuation">: [</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token number">4</span><span class="token punctuation">],</span> foo<span class="token punctuation">: {</span> c<span class="token punctuation">:</span> <span class="token string">'bar'</span> <span class="token punctuation">} })).</span><span class="token function">then</span><span class="token punctuation">(</span>console<span class="token punctuation">.</span>log<span class="token punctuation">);</span> <span class="token comment">// '04aa106279f5977f59f9067fa9712afc4aedc6f5862a8defc34552d8c7206393'</span>
</pre><label class="collapse">Show examples</label><pre class="language-js"><span class="token function">hashNode</span><span class="token punctuation">(</span><span class="token constant">JSON</span><span class="token punctuation">.</span><span class="token function">stringify</span><span class="token punctuation">({</span> a<span class="token punctuation">:</span> <span class="token string">'a'</span><span class="token punctuation">,</span> b<span class="token punctuation">: [</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token number">4</span><span class="token punctuation">],</span> foo<span class="token punctuation">: {</span> c<span class="token punctuation">:</span> <span class="token string">'bar'</span> <span class="token punctuation">} })).</span><span class="token function">then</span><span class="token punctuation">(</span>console<span class="token punctuation">.</span>log<span class="token punctuation">);</span> <span class="token comment">// '04aa106279f5977f59f9067fa9712afc4aedc6f5862a8defc34552d8c7206393'</span>
</pre><button class="primary clipboard-copy">&#128203;&nbsp;Copy to clipboard</button></div></div><div class="card fluid"><h3 id="istravisci" class="section double-padded">isTravisCI</h3><div class="section double-padded"><p>Checks if the current environment is <a href="https://travis-ci.org/">Travis CI</a>.</p><p>Checks if the current environment has the <code>TRAVIS</code> and <code>CI</code> environment variables (<a href="https://docs.travis-ci.com/user/environment-variables/#Default-Environment-Variables">reference</a>).</p><pre class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">isTravisCI</span> <span class="token operator">=</span> <span class="token punctuation">()</span> <span class="token operator">=></span> <span class="token string">'TRAVIS'</span> <span class="token keyword">in</span> process<span class="token punctuation">.</span>env <span class="token operator">&amp;&amp;</span> <span class="token string">'CI'</span> <span class="token keyword">in</span> process<span class="token punctuation">.</span>env<span class="token punctuation">;</span>
</pre><label class="collapse">Show examples</label><pre class="language-js"><span class="token function">isTravisCI</span><span class="token punctuation">();</span> <span class="token comment">// true (if code is running on Travis CI)</span>
</pre><button class="primary clipboard-copy">&#128203;&nbsp;Copy to clipboard</button></div></div><div class="card fluid"><h3 id="jsontofile" class="section double-padded">JSONToFile</h3><div class="section double-padded"><p>Writes a JSON object to a file.</p><p>Use <code>fs.writeFile()</code>, template literals and <code>JSON.stringify()</code> to write a <code>json</code> object to a <code>.json</code> file.</p><pre class="language-js"><span class="token keyword">const</span> fs <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'fs'</span><span class="token punctuation">);</span>
<span class="token keyword">const</span> <span class="token function-variable function">JSONToFile</span> <span class="token operator">=</span> <span class="token punctuation">(</span>obj<span class="token punctuation">,</span> filename<span class="token punctuation">)</span> <span class="token operator">=></span>
fs<span class="token punctuation">.</span><span class="token function">writeFile</span><span class="token punctuation">(</span><span class="token template-string"><span class="token string">`</span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>filename<span class="token interpolation-punctuation punctuation">}</span></span><span class="token string">.json`</span></span><span class="token punctuation">,</span> JSON<span class="token punctuation">.</span><span class="token function">stringify</span><span class="token punctuation">(</span>obj<span class="token punctuation">,</span> <span class="token keyword">null</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">));</span>
fs<span class="token punctuation">.</span><span class="token function">writeFile</span><span class="token punctuation">(</span><span class="token template-string"><span class="token string">`</span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>filename<span class="token interpolation-punctuation punctuation">}</span></span><span class="token string">.json`</span></span><span class="token punctuation">,</span> <span class="token constant">JSON</span><span class="token punctuation">.</span><span class="token function">stringify</span><span class="token punctuation">(</span>obj<span class="token punctuation">,</span> <span class="token keyword">null</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">));</span>
</pre><label class="collapse">Show examples</label><pre class="language-js"><span class="token function">JSONToFile</span><span class="token punctuation">({</span> test<span class="token punctuation">:</span> <span class="token string">'is passed'</span> <span class="token punctuation">},</span> <span class="token string">'testJsonFile'</span><span class="token punctuation">);</span> <span class="token comment">// writes the object to 'testJsonFile.json'</span>
</pre><button class="primary clipboard-copy">&#128203;&nbsp;Copy to clipboard</button></div></div><div class="card fluid"><h3 id="readfilelines" class="section double-padded">readFileLines</h3><div class="section double-padded"><p>Returns an array of lines from the specified file.</p><p>Use <code>readFileSync</code> function in <code>fs</code> node package to create a <code>Buffer</code> from a file. convert buffer to string using <code>toString(encoding)</code> function. creating an array from contents of file by <code>split</code>ing file content line by line (each <code>\n</code>).</p><pre class="language-js"><span class="token keyword">const</span> fs <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'fs'</span><span class="token punctuation">);</span>
<span class="token keyword">const</span> <span class="token function-variable function">readFileLines</span> <span class="token operator">=</span> filename <span class="token operator">=></span>