Travis build: 987
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@ -163,7 +163,7 @@ console<span class="token punctuation">.</span><span class="token function">log<
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</pre></div><div class="card code-card"><div class="corner intermediate"></div><div class="section card-content"><h4 id="isstream">isStream</h4><p>Checks if the given argument is a stream.</p><p>Check if the value is different from <code>null</code>, use <code>typeof</code> to check if the value is of type <code>object</code> and the <code>pipe</code> property is of type <code>function</code>.</p></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code language-js"><span class="token keyword">const</span> <span class="token function-variable function">isStream</span> <span class="token operator">=</span> val <span class="token operator">=></span> val <span class="token operator">!==</span> <span class="token keyword">null</span> <span class="token operator">&&</span> <span class="token keyword">typeof</span> val <span class="token operator">===</span> <span class="token string">'object'</span> <span class="token operator">&&</span> <span class="token keyword">typeof</span> val<span class="token punctuation">.</span>pipe <span class="token operator">===</span> <span class="token string">'function'</span><span class="token punctuation">;</span>
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</pre><label class="collapse">examples</label><pre class="section card-examples 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>
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<span class="token function">isStream</span><span class="token punctuation">(</span>fs<span class="token punctuation">.</span><span class="token function">createReadStream</span><span class="token punctuation">(</span><span class="token string">'test.txt'</span><span class="token punctuation">));</span> <span class="token comment">// true</span>
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</pre></div><div class="card code-card"><div class="corner intermediate"></div><div class="section card-content"><h4 id="istravisci">isTravisCI</h4><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></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code 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">&&</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>
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</pre></div><div class="card code-card"><div class="section card-content"><h4><a href="https://frontendmasters.com/courses/javascript-hard-parts/" target="_blank" rel="noopener noreferrer">Recommended Resource - JavaScript: The Hard Parts</a></h4><p>Take your JavaScript to the next level. Gain an understanding of callbacks, higher order functions, closure, asynchronous and object-oriented JavaScript!</p></div></div><div class="card code-card"><div class="corner intermediate"></div><div class="section card-content"><h4 id="istravisci">isTravisCI</h4><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></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code 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">&&</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>
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</pre><label class="collapse">examples</label><pre class="section card-examples 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>
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</pre></div><div class="card code-card"><div class="corner intermediate"></div><div class="section card-content"><h4 id="iswritablestream">isWritableStream</h4><p>Checks if the given argument is a writable stream.</p><p>Check if the value is different from <code>null</code>, use <code>typeof</code> to check if the value is of type <code>object</code> and the <code>pipe</code> property is of type <code>function</code>. Additionally check if the <code>typeof</code> the <code>_write</code> and <code>_writableState</code> properties are <code>function</code> and <code>object</code> respectively.</p></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code language-js"><span class="token keyword">const</span> <span class="token function-variable function">isWritableStream</span> <span class="token operator">=</span> val <span class="token operator">=></span>
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val <span class="token operator">!==</span> <span class="token keyword">null</span> <span class="token operator">&&</span>
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