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30secondsofcode
2018-03-12 20:01:03 +00:00
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README.md
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@ -2325,7 +2325,7 @@ Use `Array.reverse()` and `Array.findIndex()` to find the appropriate last index
const sortedLastIndex = (arr, n) => { const sortedLastIndex = (arr, n) => {
const isDescending = arr[0] > arr[arr.length - 1]; const isDescending = arr[0] > arr[arr.length - 1];
const index = arr.reverse().findIndex(el => (isDescending ? n <= el : n >= el)); const index = arr.reverse().findIndex(el => (isDescending ? n <= el : n >= el));
return index === -1 ? 0 : arr.length - index - 1; return index === -1 ? 0 : arr.length - index;
}; };
``` ```
@ -2333,7 +2333,7 @@ const sortedLastIndex = (arr, n) => {
<summary>Examples</summary> <summary>Examples</summary>
```js ```js
sortedLastIndex([10, 20, 30, 30, 40], 30); // 3 sortedLastIndex([10, 20, 30, 30, 40], 30); // 4
``` ```
</details> </details>

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docs/index.html
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@ -467,9 +467,9 @@ Object<span class="token punctuation">.</span><span class="token function">assig
</pre><button class="primary clipboard-copy">&#128203;&nbsp;Copy to clipboard</button></div></div><div class="card fluid"><h3 id="sortedlastindex" class="section double-padded">sortedLastIndex</h3><div class="section double-padded"><p>Returns the highest index at which value should be inserted into array in order to maintain its sort order.</p><p>Check if the array is sorted in descending order (loosely). Use <code>Array.reverse()</code> and <code>Array.findIndex()</code> to find the appropriate last index where the element should be inserted.</p><pre class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">sortedLastIndex</span> <span class="token operator">=</span> <span class="token punctuation">(</span>arr<span class="token punctuation">,</span> n<span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span> </pre><button class="primary clipboard-copy">&#128203;&nbsp;Copy to clipboard</button></div></div><div class="card fluid"><h3 id="sortedlastindex" class="section double-padded">sortedLastIndex</h3><div class="section double-padded"><p>Returns the highest index at which value should be inserted into array in order to maintain its sort order.</p><p>Check if the array is sorted in descending order (loosely). Use <code>Array.reverse()</code> and <code>Array.findIndex()</code> to find the appropriate last index where the element should be inserted.</p><pre class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">sortedLastIndex</span> <span class="token operator">=</span> <span class="token punctuation">(</span>arr<span class="token punctuation">,</span> n<span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
<span class="token keyword">const</span> isDescending <span class="token operator">=</span> arr<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>arr<span class="token punctuation">.</span>length <span class="token operator">-</span> <span class="token number">1</span><span class="token punctuation">];</span> <span class="token keyword">const</span> isDescending <span class="token operator">=</span> arr<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>arr<span class="token punctuation">.</span>length <span class="token operator">-</span> <span class="token number">1</span><span class="token punctuation">];</span>
<span class="token keyword">const</span> index <span class="token operator">=</span> arr<span class="token punctuation">.</span><span class="token function">reverse</span><span class="token punctuation">().</span><span class="token function">findIndex</span><span class="token punctuation">(</span>el <span class="token operator">=></span> <span class="token punctuation">(</span>isDescending <span class="token operator">?</span> n <span class="token operator">&lt;=</span> el <span class="token punctuation">:</span> n <span class="token operator">>=</span> el<span class="token punctuation">));</span> <span class="token keyword">const</span> index <span class="token operator">=</span> arr<span class="token punctuation">.</span><span class="token function">reverse</span><span class="token punctuation">().</span><span class="token function">findIndex</span><span class="token punctuation">(</span>el <span class="token operator">=></span> <span class="token punctuation">(</span>isDescending <span class="token operator">?</span> n <span class="token operator">&lt;=</span> el <span class="token punctuation">:</span> n <span class="token operator">>=</span> el<span class="token punctuation">));</span>
<span class="token keyword">return</span> index <span class="token operator">=== -</span><span class="token number">1</span> <span class="token operator">?</span> <span class="token number">0</span> <span class="token punctuation">:</span> arr<span class="token punctuation">.</span>length <span class="token operator">-</span> index <span class="token operator">-</span> <span class="token number">1</span><span class="token punctuation">; <span class="token keyword">return</span> index <span class="token operator">=== -</span><span class="token number">1</span> <span class="token operator">?</span> <span class="token number">0</span> <span class="token punctuation">:</span> arr<span class="token punctuation">.</span>length <span class="token operator">-</span> index<span class="token punctuation">;
};</span> };</span>
</pre><label class="collapse">Show examples</label><pre class="language-js"><span class="token function">sortedLastIndex</span><span class="token punctuation">([</span><span class="token number">10</span><span class="token punctuation">,</span> <span class="token number">20</span><span class="token punctuation">,</span> <span class="token number">30</span><span class="token punctuation">,</span> <span class="token number">30</span><span class="token punctuation">,</span> <span class="token number">40</span><span class="token punctuation">],</span> <span class="token number">30</span><span class="token punctuation">);</span> <span class="token comment">// 3</span> </pre><label class="collapse">Show examples</label><pre class="language-js"><span class="token function">sortedLastIndex</span><span class="token punctuation">([</span><span class="token number">10</span><span class="token punctuation">,</span> <span class="token number">20</span><span class="token punctuation">,</span> <span class="token number">30</span><span class="token punctuation">,</span> <span class="token number">30</span><span class="token punctuation">,</span> <span class="token number">40</span><span class="token punctuation">],</span> <span class="token number">30</span><span class="token punctuation">);</span> <span class="token comment">// 4</span>
</pre><button class="primary clipboard-copy">&#128203;&nbsp;Copy to clipboard</button></div></div><div class="card fluid"><h3 id="sortedlastindexby" class="section double-padded">sortedLastIndexBy</h3><div class="section double-padded"><p>Returns the highest index at which value should be inserted into array in order to maintain its sort order, based on a provided iterator function.</p><p>Check if the array is sorted in descending order (loosely). Use <code>Array.map()</code> to apply the iterator function to all elements of the array. Use <code>Array.reverse()</code> and <code>Array.findIndex()</code> to find the appropriate last index where the element should be inserted, based on the provided iterator function.</p><pre class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">sortedLastIndexBy</span> <span class="token operator">=</span> <span class="token punctuation">(</span>arr<span class="token punctuation">,</span> n<span class="token punctuation">,</span> fn<span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span> </pre><button class="primary clipboard-copy">&#128203;&nbsp;Copy to clipboard</button></div></div><div class="card fluid"><h3 id="sortedlastindexby" class="section double-padded">sortedLastIndexBy</h3><div class="section double-padded"><p>Returns the highest index at which value should be inserted into array in order to maintain its sort order, based on a provided iterator function.</p><p>Check if the array is sorted in descending order (loosely). Use <code>Array.map()</code> to apply the iterator function to all elements of the array. Use <code>Array.reverse()</code> and <code>Array.findIndex()</code> to find the appropriate last index where the element should be inserted, based on the provided iterator function.</p><pre class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">sortedLastIndexBy</span> <span class="token operator">=</span> <span class="token punctuation">(</span>arr<span class="token punctuation">,</span> n<span class="token punctuation">,</span> fn<span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
<span class="token keyword">const</span> isDescending <span class="token operator">=</span> <span class="token function">fn</span><span class="token punctuation">(</span>arr<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">])</span> <span class="token operator">></span> <span class="token function">fn</span><span class="token punctuation">(</span>arr<span class="token punctuation">[</span>arr<span class="token punctuation">.</span>length <span class="token operator">-</span> <span class="token number">1</span><span class="token punctuation">]);</span> <span class="token keyword">const</span> isDescending <span class="token operator">=</span> <span class="token function">fn</span><span class="token punctuation">(</span>arr<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">])</span> <span class="token operator">></span> <span class="token function">fn</span><span class="token punctuation">(</span>arr<span class="token punctuation">[</span>arr<span class="token punctuation">.</span>length <span class="token operator">-</span> <span class="token number">1</span><span class="token punctuation">]);</span>
<span class="token keyword">const</span> val <span class="token operator">=</span> <span class="token function">fn</span><span class="token punctuation">(</span>n<span class="token punctuation">);</span> <span class="token keyword">const</span> val <span class="token operator">=</span> <span class="token function">fn</span><span class="token punctuation">(</span>n<span class="token punctuation">);</span>