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30secondsofcode
2018-01-24 15:39:36 +00:00
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@ -946,8 +946,8 @@ own individual rating by supplying it as the third argument.
};</span>
</pre><label class="collapse">Show examples</label><pre class="language-js"><span class="token function">median</span><span class="token punctuation">([</span><span class="token number">5</span><span class="token punctuation">,</span> <span class="token number">6</span><span class="token punctuation">,</span> <span class="token number">50</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token operator">-</span><span class="token number">5</span><span class="token punctuation">]);</span> <span class="token comment">// 5</span>
</pre><button class="primary clipboard-copy">&#128203;&nbsp;Copy to clipboard</button></div></div><div class="card fluid"><h3 id="minby" class="section double-padded">minBy</h3><div class="section double-padded"><p>Returns the minimum value of an array, after mapping each element to a value using the provided function.</p><p>Use <code>Array.map()</code> to map each element to the value returned by <code>fn</code>, <code>Math.min()</code> to get the maximum value.</p><pre class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">minBy</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">min</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">Show examples</label><pre class="language-js"><span class="token function">minBy</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">minBy</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><label class="collapse">Show examples</label><pre class="language-js"><span class="token function">minBy</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">// 2</span>
<span class="token function">minBy</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">// 2</span>
</pre><button class="primary clipboard-copy">&#128203;&nbsp;Copy to clipboard</button></div></div><div class="card fluid"><h3 id="percentile" class="section double-padded">percentile</h3><div class="section double-padded"><p>Uses the percentile formula to calculate how many numbers in the given array are less or equal to the given value.</p><p>Use <code>Array.reduce()</code> to calculate how many numbers are below the value and how many are the same value and apply the percentile formula.</p><pre class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">percentile</span> <span class="token operator">=</span> <span class="token punctuation">(</span>arr<span class="token punctuation">,</span> val<span class="token punctuation">)</span> <span class="token operator">=></span>
<span class="token number">100</span> <span class="token operator">*</span> arr<span class="token punctuation">.</span><span class="token function">reduce</span><span class="token punctuation">((</span>acc<span class="token punctuation">,</span> v<span class="token punctuation">)</span> <span class="token operator">=></span> acc <span class="token operator">+</span> <span class="token punctuation">(</span>v <span class="token operator">&lt;</span> val <span class="token operator">?</span> <span class="token number">1</span> <span class="token punctuation">:</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token punctuation">(</span>v <span class="token operator">===</span> val <span class="token operator">?</span> <span class="token number">0.5</span> <span class="token punctuation">:</span> <span class="token number">0</span><span class="token punctuation">),</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token operator">/</span> arr<span class="token punctuation">.</span>length<span class="token punctuation">;</span>
</pre><label class="collapse">Show examples</label><pre class="language-js"><span class="token function">percentile</span><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> <span class="token number">5</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">8</span><span class="token punctuation">,</span> <span class="token number">9</span><span class="token punctuation">,</span> <span class="token number">10</span><span class="token punctuation">],</span> <span class="token number">6</span><span class="token punctuation">);</span> <span class="token comment">// 55</span>