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30secondsofcode
2018-09-10 05:32:36 +00:00
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@ -278,7 +278,7 @@ Foo<span class="token punctuation">.</span>prototype<span class="token punctuati
{</span> id<span class="token punctuation">:</span> <span class="token number">5</span><span class="token punctuation">,</span> parent_id<span class="token punctuation">:</span> <span class="token number">4</span> <span class="token punctuation">}
];</span>
<span class="token keyword">const</span> nestedComments <span class="token operator">=</span> <span class="token function">nest</span><span class="token punctuation">(</span>comments<span class="token punctuation">);</span> <span class="token comment">// [{ id: 1, parent_id: null, children: [...] }]</span>
</pre></div><div class="card code-card"><div class="corner beginner"></div><div class="section card-content"><h4 id="objectfrompairs">objectFromPairs</h4><p>Creates an object from the given key-value pairs.</p><p>Use <code>Array.reduce()</code> to create and combine key-value pairs.</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">objectFromPairs</span> <span class="token operator">=</span> arr <span class="token operator">=></span> arr<span class="token punctuation">.</span><span class="token function">reduce</span><span class="token punctuation">((</span>a<span class="token punctuation">,</span> v<span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">((</span>a<span class="token punctuation">[</span>v<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]]</span> <span class="token operator">=</span> v<span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]),</span> a<span class="token punctuation">), {});</span>
</pre></div><div class="card code-card"><div class="corner beginner"></div><div class="section card-content"><h4 id="objectfrompairs">objectFromPairs</h4><p>Creates an object from the given key-value pairs.</p><p>Use <code>Array.reduce()</code> to create and combine key-value pairs.</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">objectFromPairs</span> <span class="token operator">=</span> arr <span class="token operator">=></span> arr<span class="token punctuation">.</span><span class="token function">reduce</span><span class="token punctuation">((</span>a<span class="token punctuation">, [</span>key<span class="token punctuation">,</span> val<span class="token punctuation">])</span> <span class="token operator">=></span> <span class="token punctuation">((</span>a<span class="token punctuation">[</span>key<span class="token punctuation">]</span> <span class="token operator">=</span> val<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">objectFromPairs</span><span class="token punctuation">([[</span><span class="token string">'a'</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">], [</span><span class="token string">'b'</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">]]);</span> <span class="token comment">// {a: 1, b: 2}</span>
</pre></div><div class="card code-card"><div class="corner beginner"></div><div class="section card-content"><h4 id="objecttopairs">objectToPairs</h4><p>Creates an array of key-value pair arrays from an object.</p><p>Use <code>Object.keys()</code> and <code>Array.map()</code> to iterate over the object's keys and produce an array with key-value pairs.</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">objectToPairs</span> <span class="token operator">=</span> obj <span class="token operator">=></span> Object<span class="token punctuation">.</span><span class="token function">keys</span><span class="token punctuation">(</span>obj<span class="token punctuation">).</span><span class="token function">map</span><span class="token punctuation">(</span>k <span class="token operator">=></span> <span class="token punctuation">[</span>k<span class="token punctuation">,</span> obj<span class="token punctuation">[</span>k<span class="token punctuation">]]);</span>
</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token function">objectToPairs</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> <span class="token comment">// [['a',1],['b',2]]</span>