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30secondsofcode
2018-05-17 14:29:22 +00:00
parent 58f3241153
commit 7afdc10372
2 changed files with 4 additions and 4 deletions
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4
README.md
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@ -2670,12 +2670,12 @@ takeRightWhile([1, 2, 3, 4], n => n < 3); // [3, 4]
Removes elements in an array until the passed function returns `true`. Returns the removed elements.
Loop through the array, using a `for...of` loop over `Array.keys()` until the returned value from the function is `true`.
Loop through the array, using a `for...of` loop over `Array.entries()` until the returned value from the function is `true`.
Return the removed elements, using `Array.slice()`.
```js
const takeWhile = (arr, func) => {
for (let i of arr.keys()) if (func(arr[i])) return arr.slice(0, i);
for (const [i, val] of arr.entries()) if (func(val)) return arr.slice(0, i);
return arr;
};
```

4
docs/array.html
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@ -469,8 +469,8 @@
<span class="token keyword">return</span> arr<span class="token punctuation">;
};</span>
</pre><label class="collapse">Show examples</label><pre class="language-js"><span class="token function">takeRightWhile</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">// [3, 4]</span>
</pre><button class="primary clipboard-copy">&#128203;&nbsp;Copy to clipboard</button></div></div><div class="card fluid"><h3 id="takewhile" class="section double-padded">takeWhile</h3><div class="section double-padded"><p>Removes elements in an array until the passed function returns <code>true</code>. Returns the removed elements.</p><p>Loop through the array, using a <code>for...of</code> loop over <code>Array.keys()</code> until the returned value from the function is <code>true</code>. Return the removed elements, using <code>Array.slice()</code>.</p><pre class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">takeWhile</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">for</span> <span class="token punctuation">(</span><span class="token keyword">let</span> i <span class="token keyword">of</span> arr<span class="token punctuation">.</span><span class="token function">keys</span><span class="token punctuation">())</span> <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">func</span><span class="token punctuation">(</span>arr<span class="token punctuation">[</span>i<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> i<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="takewhile" class="section double-padded">takeWhile</h3><div class="section double-padded"><p>Removes elements in an array until the passed function returns <code>true</code>. Returns the removed elements.</p><p>Loop through the array, using a <code>for...of</code> loop over <code>Array.entries()</code> until the returned value from the function is <code>true</code>. Return the removed elements, using <code>Array.slice()</code>.</p><pre class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">takeWhile</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">for</span> <span class="token punctuation">(</span><span class="token keyword">const</span> <span class="token punctuation">[</span>i<span class="token punctuation">,</span> val<span class="token punctuation">]</span> <span class="token keyword">of</span> arr<span class="token punctuation">.</span><span class="token function">entries</span><span class="token punctuation">())</span> <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">func</span><span class="token punctuation">(</span>val<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> i<span class="token punctuation">);</span>
<span class="token keyword">return</span> arr<span class="token punctuation">;
};</span>
</pre><label class="collapse">Show examples</label><pre class="language-js"><span class="token function">takeWhile</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">>=</span> <span class="token number">3</span><span class="token punctuation">);</span> <span class="token comment">// [1, 2]</span>