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30secondsofcode
2019-02-09 09:31:30 +00:00
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@ -220,7 +220,7 @@ own individual rating by supplying it as the third argument.
</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token function">luhnCheck</span><span class="token punctuation">(</span><span class="token string">'4485275742308327'</span><span class="token punctuation">);</span> <span class="token comment">// true</span>
<span class="token function">luhnCheck</span><span class="token punctuation">(</span><span class="token number">6011329933655299</span><span class="token punctuation">);</span> <span class="token comment">// false</span>
<span class="token function">luhnCheck</span><span class="token punctuation">(</span><span class="token number">123456789</span><span class="token punctuation">);</span> <span class="token comment">// false</span>
</pre></div><div class="card code-card"><div class="corner beginner"></div><div class="section card-content"><h4 id="maxby">maxBy</h4><p>Returns the maximum value of an array, after mapping each element to a value using the provided function.</p><p>Use <code>Array.prototype.map()</code> to map each element to the value returned by <code>fn</code>, <code>Math.max()</code> to get the maximum value.</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">maxBy</span> <span class="token operator">=</span> <span class="token punctuation">(</span>arr<span class="token punctuation">,</span> fn<span class="token punctuation">)</span> <span class="token operator">=></span> Math<span class="token punctuation">.</span><span class="token function">max</span><span class="token punctuation">(</span><span class="token operator">...</span>arr<span class="token punctuation">.</span><span class="token function">map</span><span class="token punctuation">(</span><span class="token keyword">typeof</span> fn <span class="token operator">===</span> <span class="token string">'function'</span> <span class="token operator">?</span> fn <span class="token punctuation">:</span> val <span class="token operator">=></span> val<span class="token punctuation">[</span>fn<span class="token punctuation">]));</span>
</pre></div><div class="card code-card"><div class="section card-content"><h4><a href="https://frontendmasters.com/courses/js-fundamentals-functional-v2/" target="_blank" rel="noopener noreferrer">Recommended Resource - JavaScript: From Fundamentals to Functional JS</a></h4><p>Learn higher-order functions, closures, scope, master key functional methods like map, reduce and filter and promises and ES6+ asynchronous JavaScript.</p></div></div><div class="card code-card"><div class="corner beginner"></div><div class="section card-content"><h4 id="maxby">maxBy</h4><p>Returns the maximum value of an array, after mapping each element to a value using the provided function.</p><p>Use <code>Array.prototype.map()</code> to map each element to the value returned by <code>fn</code>, <code>Math.max()</code> to get the maximum value.</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">maxBy</span> <span class="token operator">=</span> <span class="token punctuation">(</span>arr<span class="token punctuation">,</span> fn<span class="token punctuation">)</span> <span class="token operator">=></span> Math<span class="token punctuation">.</span><span class="token function">max</span><span class="token punctuation">(</span><span class="token operator">...</span>arr<span class="token punctuation">.</span><span class="token function">map</span><span class="token punctuation">(</span><span class="token keyword">typeof</span> fn <span class="token operator">===</span> <span class="token string">'function'</span> <span class="token operator">?</span> fn <span class="token punctuation">:</span> val <span class="token operator">=></span> val<span class="token punctuation">[</span>fn<span class="token punctuation">]));</span>
</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token function">maxBy</span><span class="token punctuation">([{</span> n<span class="token punctuation">:</span> <span class="token number">4</span> <span class="token punctuation">}, {</span> n<span class="token punctuation">:</span> <span class="token number">2</span> <span class="token punctuation">}, {</span> n<span class="token punctuation">:</span> <span class="token number">8</span> <span class="token punctuation">}, {</span> n<span class="token punctuation">:</span> <span class="token number">6</span> <span class="token punctuation">}],</span> o <span class="token operator">=></span> o<span class="token punctuation">.</span>n<span class="token punctuation">);</span> <span class="token comment">// 8</span>
<span class="token function">maxBy</span><span class="token punctuation">([{</span> n<span class="token punctuation">:</span> <span class="token number">4</span> <span class="token punctuation">}, {</span> n<span class="token punctuation">:</span> <span class="token number">2</span> <span class="token punctuation">}, {</span> n<span class="token punctuation">:</span> <span class="token number">8</span> <span class="token punctuation">}, {</span> n<span class="token punctuation">:</span> <span class="token number">6</span> <span class="token punctuation">}],</span> <span class="token string">'n'</span><span class="token punctuation">);</span> <span class="token comment">// 8</span>
</pre></div><div class="card code-card"><div class="corner intermediate"></div><div class="section card-content"><h4 id="median">median</h4><p>Returns the median of an array of numbers.</p><p>Find the middle of the array, use <code>Array.prototype.sort()</code> to sort the values. Return the number at the midpoint if <code>length</code> is odd, otherwise the average of the two middle numbers.</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">median</span> <span class="token operator">=</span> arr <span class="token operator">=></span> <span class="token punctuation">{</span>