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30secondsofcode
2019-03-03 00:10:36 +00:00
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README.md
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@ -5906,7 +5906,7 @@ midpoint([1, 3], [2, 4]); // [1.5, 3.5]
Returns the minimum value of an array, after mapping each element to a value using the provided function.
Use `Array.prototype.map()` to map each element to the value returned by `fn`, `Math.min()` to get the maximum value.
Use `Array.prototype.map()` to map each element to the value returned by `fn`, `Math.min()` to get the minimum value.
```js
const minBy = (arr, fn) => Math.min(...arr.map(typeof fn === 'function' ? fn : val => val[fn]));

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docs/math.html
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@ -236,7 +236,7 @@ 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">midpoint</span><span class="token punctuation">([</span><span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">], [</span><span class="token number">4</span><span class="token punctuation">,</span> <span class="token number">4</span><span class="token punctuation">]);</span> <span class="token comment">// [3, 3]</span>
<span class="token function">midpoint</span><span class="token punctuation">([</span><span class="token number">4</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">6</span><span class="token punctuation">]);</span> <span class="token comment">// [5, 5]</span>
<span class="token function">midpoint</span><span class="token punctuation">([</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">], [</span><span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">4</span><span class="token punctuation">]);</span> <span class="token comment">// [1.5, 3.5]</span>
</pre></div><div class="card code-card"><div class="corner beginner"></div><div class="section card-content"><h4 id="minby">minBy</h4><p>Returns the minimum 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.min()</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">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></div><div class="card code-card"><div class="corner beginner"></div><div class="section card-content"><h4 id="minby">minBy</h4><p>Returns the minimum 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.min()</code> to get the minimum 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">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">examples</label><pre class="section card-examples 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></div><div class="card code-card"><div class="corner intermediate"></div><div class="section card-content"><h4 id="percentile">percentile</h4><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.prototype.reduce()</code> to calculate how many numbers are below the value and how many are the same value and apply the percentile formula.</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">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>