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30secondsofcode
2018-10-16 17:33:35 +00:00
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@ -85,6 +85,8 @@
};</span>
</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token function">binarySearch</span><span class="token punctuation">([</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">4</span><span class="token punctuation">,</span> <span class="token number">6</span><span class="token punctuation">,</span> <span class="token number">7</span><span class="token punctuation">,</span> <span class="token number">12</span><span class="token punctuation">,</span> <span class="token number">13</span><span class="token punctuation">,</span> <span class="token number">15</span><span class="token punctuation">,</span> <span class="token number">18</span><span class="token punctuation">,</span> <span class="token number">19</span><span class="token punctuation">,</span> <span class="token number">20</span><span class="token punctuation">,</span> <span class="token number">22</span><span class="token punctuation">,</span> <span class="token number">24</span><span class="token punctuation">],</span> <span class="token number">6</span><span class="token punctuation">);</span> <span class="token comment">// 2</span>
<span class="token function">binarySearch</span><span class="token punctuation">([</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">4</span><span class="token punctuation">,</span> <span class="token number">6</span><span class="token punctuation">,</span> <span class="token number">7</span><span class="token punctuation">,</span> <span class="token number">12</span><span class="token punctuation">,</span> <span class="token number">13</span><span class="token punctuation">,</span> <span class="token number">15</span><span class="token punctuation">,</span> <span class="token number">18</span><span class="token punctuation">,</span> <span class="token number">19</span><span class="token punctuation">,</span> <span class="token number">20</span><span class="token punctuation">,</span> <span class="token number">22</span><span class="token punctuation">,</span> <span class="token number">24</span><span class="token punctuation">],</span> <span class="token number">21</span><span class="token punctuation">);</span> <span class="token comment">// -1</span>
</pre></div><div class="card code-card"><div class="section card-content"><h4 id="celsiustofahrenheit.md">celsiusToFahrenheit</h4><p>Celsius to Fahrenheit temperature conversion.</p><p>Follows the conversion formula <code>F = 1.8C + 32</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">celsiusToFahrenheit</span> <span class="token operator">=</span> degrees <span class="token operator">=></span> <span class="token number">1.8</span> <span class="token operator">*</span> degrees <span class="token operator">+</span> <span class="token number">32</span><span class="token punctuation">;</span>
</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token function">celsiusToFahrenheit</span><span class="token punctuation">(</span><span class="token number">33</span><span class="token punctuation">)</span> <span class="token comment">// 91.4</span>
</pre></div><div class="card code-card"><div class="section card-content"><h4 id="cleanobj.md">cleanObj</h4><p>Removes any properties except the ones specified from a JSON object.</p><p>Use <code>Object.keys()</code> method to loop over given JSON object and deleting keys that are not included in given array. If you pass a special key,<code>childIndicator</code>, it will search deeply apply the function to inner objects, too.</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">cleanObj</span> <span class="token operator">=</span> <span class="token punctuation">(</span>obj<span class="token punctuation">,</span> keysToKeep <span class="token operator">=</span> <span class="token punctuation">[],</span> childIndicator<span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
Object<span class="token punctuation">.</span><span class="token function">keys</span><span class="token punctuation">(</span>obj<span class="token punctuation">).</span><span class="token function">forEach</span><span class="token punctuation">(</span>key <span class="token operator">=></span> <span class="token punctuation">{</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>key <span class="token operator">===</span> childIndicator<span class="token punctuation">) {</span>
@ -125,6 +127,8 @@
<span class="token function">factors</span><span class="token punctuation">(</span><span class="token number">12</span><span class="token punctuation">,</span> <span class="token boolean">true</span><span class="token punctuation">);</span> <span class="token comment">// [2,3]</span>
<span class="token function">factors</span><span class="token punctuation">(</span><span class="token operator">-</span><span class="token number">12</span><span class="token punctuation">);</span> <span class="token comment">// [2, -2, 3, -3, 4, -4, 6, -6, 12, -12]</span>
<span class="token function">factors</span><span class="token punctuation">(</span><span class="token operator">-</span><span class="token number">12</span><span class="token punctuation">,</span> <span class="token boolean">true</span><span class="token punctuation">);</span> <span class="token comment">// [2,3]</span>
</pre></div><div class="card code-card"><div class="section card-content"><h4 id="fahrenheittocelsius.md">fahrenheitToCelsius</h4><p>Fahrenheit to Celsius temperature conversion.</p><p>Follows the conversion formula <code>C = (F - 32) * 5/9</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">fahrenheitToCelsius</span> <span class="token operator">=</span> degrees <span class="token operator">=></span> <span class="token punctuation">(</span>degrees <span class="token operator">-</span> <span class="token number">32</span><span class="token punctuation">)</span> <span class="token operator">*</span> <span class="token number">5</span><span class="token operator">/</span><span class="token number">9</span><span class="token punctuation">;</span>
</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token function">fahrenheitToCelsius</span><span class="token punctuation">(</span><span class="token number">32</span><span class="token punctuation">);</span> <span class="token comment">// 0</span>
</pre></div><div class="card code-card"><div class="section card-content"><h4 id="fibonaccicountuntilnum.md">fibonacciCountUntilNum</h4><p>Returns the number of fibonnacci numbers up to <code>num</code>(<code>0</code> and <code>num</code> inclusive).</p><p>Use a mathematical formula to calculate the number of fibonacci numbers until <code>num</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">fibonacciCountUntilNum</span> <span class="token operator">=</span> num <span class="token operator">=></span>
Math<span class="token punctuation">.</span><span class="token function">ceil</span><span class="token punctuation">(</span>Math<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>num <span class="token operator">*</span> Math<span class="token punctuation">.</span><span class="token function">sqrt</span><span class="token punctuation">(</span><span class="token number">5</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token number">1</span> <span class="token operator">/</span> <span class="token number">2</span><span class="token punctuation">)</span> <span class="token operator">/</span> Math<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">((</span>Math<span class="token punctuation">.</span><span class="token function">sqrt</span><span class="token punctuation">(</span><span class="token number">5</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token number">1</span><span class="token punctuation">)</span> <span class="token operator">/</span> <span class="token number">2</span><span class="token punctuation">));</span>
</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token function">fibonacciCountUntilNum</span><span class="token punctuation">(</span><span class="token number">10</span><span class="token punctuation">);</span> <span class="token comment">// 7</span>