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30secondsofcode
2018-10-01 16:35:03 +00:00
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@ -513,11 +513,8 @@ console<span class="token punctuation">.</span><span class="token function">log<
</pre></div><div class="card code-card"><div class="corner intermediate"></div><div class="section card-content"><h4 id="takeright">takeRight</h4><p>Returns an array with n elements removed from the end.</p><p>Use <code>Array.prototype.slice()</code> to create a slice of the array with <code>n</code> elements taken from the end.</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">takeRight</span> <span class="token operator">=</span> <span class="token punctuation">(</span>arr<span class="token punctuation">,</span> n <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">)</span> <span class="token operator">=></span> arr<span class="token punctuation">.</span><span class="token function">slice</span><span class="token punctuation">(</span>arr<span class="token punctuation">.</span>length <span class="token operator">-</span> n<span class="token punctuation">,</span> arr<span class="token punctuation">.</span>length<span class="token punctuation">);</span>
</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token function">takeRight</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">// [ 2, 3 ]</span>
<span class="token function">takeRight</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="takerightwhile">takeRightWhile</h4><p>Removes elements from the end of 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.prototype.keys()</code> until the returned value from the function is <code>true</code>. Return the removed elements, using <code>Array.prototype.reverse()</code> and <code>Array.prototype.slice()</code>.</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">takeRightWhile</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">reverse</span><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">reverse</span><span class="token punctuation">().</span><span class="token function">slice</span><span class="token punctuation">(</span>arr<span class="token punctuation">.</span>length <span class="token operator">-</span> i<span class="token punctuation">,</span> arr<span class="token punctuation">.</span>length<span class="token punctuation">);</span>
<span class="token keyword">return</span> arr<span class="token punctuation">;
};</span>
</pre></div><div class="card code-card"><div class="corner intermediate"></div><div class="section card-content"><h4 id="takerightwhile">takeRightWhile</h4><p>Removes elements from the end of an array until the passed function returns <code>true</code>. Returns the removed elements.</p><p>Loop through the array, using a <code>Array.prototype.reduceRight()</code> and accumulating elements while the function returns falsy 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">takeRightWhile</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>
arr<span class="token punctuation">.</span><span class="token function">reduceRight</span><span class="token punctuation">((</span>acc<span class="token punctuation">,</span> el<span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">(</span><span class="token function">func</span><span class="token punctuation">(</span>el<span class="token punctuation">)</span> <span class="token operator">?</span> acc <span class="token punctuation">: [</span>el<span class="token punctuation">,</span> <span class="token operator">...</span>acc<span class="token punctuation">]), []);</span>
</pre><label class="collapse">examples</label><pre class="section card-examples 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></div><div class="card code-card"><div class="corner intermediate"></div><div class="section card-content"><h4 id="takewhile">takeWhile</h4><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.prototype.entries()</code> until the returned value from the function is <code>true</code>. Return the removed elements, using <code>Array.prototype.slice()</code>.</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">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>