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30secondsofcode
2019-05-29 06:19:16 +00:00
parent 7db36a21d1
commit 9063fad13d
5 changed files with 12 additions and 6 deletions
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6
README.md
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@ -1201,8 +1201,9 @@ Returns the remaining elements.
```js
const dropRightWhile = (arr, func) => {
while (arr.length > 0 && !func(arr[arr.length - 1])) arr = arr.slice(0, -1);
return arr;
let rightIndex = arr.length;
while (rightIndex-- && !func(arr[rightIndex]));
return arr.slice(0, rightIndex + 1);
};
```
@ -4736,6 +4737,7 @@ const checkProp = (predicate, prop) => obj => !!predicate(obj[prop]);
const lengthIs4 = checkProp(l => l === 4, 'length');
lengthIs4([]); // false
lengthIs4([1,2,3,4]); // true

1
docs/function.html
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@ -154,6 +154,7 @@ console<span class="token punctuation">.</span><span class="token function">log<
<span class="token keyword">const</span> lengthIs4 <span class="token operator">=</span> <span class="token function">checkProp</span><span class="token punctuation">(</span>l <span class="token operator">=></span> l <span class="token operator">===</span> <span class="token number">4</span><span class="token punctuation">,</span> <span class="token string">'length'</span><span class="token punctuation">);</span>
<span class="token function">lengthIs4</span><span class="token punctuation">([]);</span> <span class="token comment">// false</span>
<span class="token function">lengthIs4</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 comment">// true</span>

5
docs/index.html
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@ -155,8 +155,9 @@
<span class="token function">dropRight</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">2</span><span class="token punctuation">);</span> <span class="token comment">// [1]</span>
<span class="token function">dropRight</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">42</span><span class="token punctuation">);</span> <span class="token comment">// []</span>
</pre></div><div class="card code-card"><div class="corner intermediate"></div><div class="section card-content"><h4 id="droprightwhile">dropRightWhile</h4><p>Removes elements from the end of an array until the passed function returns <code>true</code>. Returns the remaining elements in the array.</p><p>Loop through the array, using <code>Array.prototype.slice()</code> to drop the last element of the array until the returned value from the function is <code>true</code>. Returns the remaining elements.</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">dropRightWhile</span> <span class="token operator">=</span> <span class="token punctuation">(</span>arr<span class="token punctuation">,</span> func<span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
<span class="token keyword">while</span> <span class="token punctuation">(</span>arr<span class="token punctuation">.</span>length <span class="token operator">></span> <span class="token number">0</span> <span class="token operator">&amp;&amp; !</span><span class="token function">func</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> arr <span class="token operator">=</span> arr<span class="token punctuation">.</span><span class="token function">slice</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 number">1</span><span class="token punctuation">);</span>
<span class="token keyword">return</span> arr<span class="token punctuation">;
<span class="token keyword">let</span> rightIndex <span class="token operator">=</span> arr<span class="token punctuation">.</span>length<span class="token punctuation">;</span>
<span class="token keyword">while</span> <span class="token punctuation">(</span>rightIndex<span class="token operator">-- &amp;&amp; !</span><span class="token function">func</span><span class="token punctuation">(</span>arr<span class="token punctuation">[</span>rightIndex<span class="token punctuation">]));</span>
<span class="token keyword">return</span> arr<span class="token punctuation">.</span><span class="token function">slice</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span> rightIndex <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">dropRightWhile</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> n <span class="token operator">=></span> n <span class="token operator">&lt;</span> <span class="token number">3</span><span class="token punctuation">);</span> <span class="token comment">// [1, 2]</span>
</pre></div><div class="card code-card"><div class="corner intermediate"></div><div class="section card-content"><h4 id="dropwhile">dropWhile</h4><p>Removes elements in an array until the passed function returns <code>true</code>. Returns the remaining elements in the array.</p><p>Loop through the array, using <code>Array.prototype.slice()</code> to drop the first element of the array until the returned value from the function is <code>true</code>. Returns the remaining elements.</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">dropWhile</span> <span class="token operator">=</span> <span class="token punctuation">(</span>arr<span class="token punctuation">,</span> func<span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>

1
snippets/checkProp.md
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@ -19,6 +19,7 @@ const checkProp = (predicate, prop) => obj => !!predicate(obj[prop]);
const lengthIs4 = checkProp(l => l === 4, 'length');
lengthIs4([]); // false
lengthIs4([1,2,3,4]); // true

5
test/_30s.js
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@ -279,8 +279,9 @@ const distance = (x0, y0, x1, y1) => Math.hypot(x1 - x0, y1 - y0);
const drop = (arr, n = 1) => arr.slice(n);
const dropRight = (arr, n = 1) => arr.slice(0, -n);
const dropRightWhile = (arr, func) => {
while (arr.length > 0 && !func(arr[arr.length - 1])) arr = arr.slice(0, -1);
return arr;
let rightIndex = arr.length;
while (rightIndex-- && !func(arr[rightIndex]));
return arr.slice(0, rightIndex + 1);
};
const dropWhile = (arr, func) => {
while (arr.length > 0 && !func(arr[0])) arr = arr.slice(1);