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30secondsofcode
2018-10-25 10:28:14 +00:00
parent e44800555f
commit fb76573a43
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3
README.md
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@ -1828,8 +1828,7 @@ Returns `undefined` if no arguments are provided.
Use `Array.prototype.reduce()`, comparing the `length` of objects to find the longest one.
```js
const longestItem = (val, ...vals) =>
[val, ...vals].reduce((a, x) => (x.length > a.length ? x : a));
const longestItem = (...vals) => vals.reduce((a, x) => (x.length > a.length ? x : a));
```
<details>

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docs/index.html
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@ -280,8 +280,7 @@
<span class="token function">JSONtoCSV</span><span class="token punctuation">([{</span> a<span class="token punctuation">:</span> <span class="token number">1</span><span class="token punctuation">,</span> b<span class="token punctuation">:</span> <span class="token number">2</span> <span class="token punctuation">}, {</span> a<span class="token punctuation">:</span> <span class="token number">3</span><span class="token punctuation">,</span> b<span class="token punctuation">:</span> <span class="token number">4</span><span class="token punctuation">,</span> c<span class="token punctuation">:</span> <span class="token number">5</span> <span class="token punctuation">}, {</span> a<span class="token punctuation">:</span> <span class="token number">6</span> <span class="token punctuation">}, {</span> b<span class="token punctuation">:</span> <span class="token number">7</span> <span class="token punctuation">}], [</span><span class="token string">'a'</span><span class="token punctuation">,</span> <span class="token string">'b'</span><span class="token punctuation">],</span> <span class="token string">';'</span><span class="token punctuation">);</span> <span class="token comment">// 'a;b\n"1";"2"\n"3";"4"\n"6";""\n"";"7"'</span>
</pre></div><div class="card code-card"><div class="corner beginner"></div><div class="section card-content"><h4 id="last">last</h4><p>Returns the last element in an array.</p><p>Use <code>arr.length - 1</code> to compute the index of the last element of the given array and returning it.</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">last</span> <span class="token operator">=</span> arr <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>
</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token function">last</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 comment">// 3</span>
</pre></div><div class="card code-card"><div class="corner intermediate"></div><div class="section card-content"><h4 id="longestitem">longestItem</h4><p>Takes any number of iterable objects or objects with a <code>length</code> property and returns the longest one. If multiple objects have the same length, the first one will be returned. Returns <code>undefined</code> if no arguments are provided.</p><p>Use <code>Array.prototype.reduce()</code>, comparing the <code>length</code> of objects to find the longest one.</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">longestItem</span> <span class="token operator">=</span> <span class="token punctuation">(</span>val<span class="token punctuation">,</span> <span class="token operator">...</span>vals<span class="token punctuation">)</span> <span class="token operator">=></span>
<span class="token punctuation">[</span>val<span class="token punctuation">,</span> <span class="token operator">...</span>vals<span class="token punctuation">].</span><span class="token function">reduce</span><span class="token punctuation">((</span>a<span class="token punctuation">,</span> x<span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">(</span>x<span class="token punctuation">.</span>length <span class="token operator">></span> a<span class="token punctuation">.</span>length <span class="token operator">?</span> x <span class="token punctuation">:</span> a<span class="token punctuation">));</span>
</pre></div><div class="card code-card"><div class="corner intermediate"></div><div class="section card-content"><h4 id="longestitem">longestItem</h4><p>Takes any number of iterable objects or objects with a <code>length</code> property and returns the longest one. If multiple objects have the same length, the first one will be returned. Returns <code>undefined</code> if no arguments are provided.</p><p>Use <code>Array.prototype.reduce()</code>, comparing the <code>length</code> of objects to find the longest one.</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">longestItem</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token operator">...</span>vals<span class="token punctuation">)</span> <span class="token operator">=></span> vals<span class="token punctuation">.</span><span class="token function">reduce</span><span class="token punctuation">((</span>a<span class="token punctuation">,</span> x<span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">(</span>x<span class="token punctuation">.</span>length <span class="token operator">></span> a<span class="token punctuation">.</span>length <span class="token operator">?</span> x <span class="token punctuation">:</span> a<span class="token punctuation">));</span>
</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token function">longestItem</span><span class="token punctuation">(</span><span class="token string">'this'</span><span class="token punctuation">,</span> <span class="token string">'is'</span><span class="token punctuation">,</span> <span class="token string">'a'</span><span class="token punctuation">,</span> <span class="token string">'testcase'</span><span class="token punctuation">);</span> <span class="token comment">// 'testcase'</span>
<span class="token function">longestItem</span><span class="token punctuation">(</span><span class="token operator">...</span><span class="token punctuation">[</span><span class="token string">'a'</span><span class="token punctuation">,</span> <span class="token string">'ab'</span><span class="token punctuation">,</span> <span class="token string">'abc'</span><span class="token punctuation">]);</span> <span class="token comment">// 'abc'</span>
<span class="token function">longestItem</span><span class="token punctuation">(</span><span class="token operator">...</span><span class="token punctuation">[</span><span class="token string">'a'</span><span class="token punctuation">,</span> <span class="token string">'ab'</span><span class="token punctuation">,</span> <span class="token string">'abc'</span><span class="token punctuation">],</span> <span class="token string">'abcd'</span><span class="token punctuation">);</span> <span class="token comment">// 'abcd'</span>

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snippets/longestItem.md
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@ -7,8 +7,7 @@ Returns `undefined` if no arguments are provided.
Use `Array.prototype.reduce()`, comparing the `length` of objects to find the longest one.
```js
const longestItem = (...vals) =>
vals.reduce((a, x) => (x.length > a.length ? x : a));
const longestItem = (...vals) => vals.reduce((a, x) => (x.length > a.length ? x : a));
```
```js

3
test/_30s.js
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@ -642,8 +642,7 @@ const lcm = (...arr) => {
const _lcm = (x, y) => (x * y) / gcd(x, y);
return [...arr].reduce((a, b) => _lcm(a, b));
};
const longestItem = (val, ...vals) =>
[val, ...vals].reduce((a, x) => (x.length > a.length ? x : a));
const longestItem = (...vals) => vals.reduce((a, x) => (x.length > a.length ? x : a));
const lowercaseKeys = obj =>
Object.keys(obj).reduce((acc, key) => {
acc[key.toLowerCase()] = obj[key];