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30secondsofcode
2019-06-13 05:07:40 +00:00
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@ -145,6 +145,7 @@ console<span class="token punctuation">.</span><span class="token function">log<
]);</span>
</pre></div><div class="card code-card"><div class="corner beginner" aria-label="beginner" title="beginner"></div><div class="section card-content"><h4 id="checkprop">checkProp</h4><p>Given a <code>predicate</code> function and a <code>prop</code> string, this curried function will then take an <code>object</code> to inspect by calling the property and passing it to the predicate.</p><p>Summon <code>prop</code> on <code>obj</code>, pass it to a provided <code>predicate</code> function and return a masked boolean.</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">checkProp</span> <span class="token operator">=</span> <span class="token punctuation">(</span>predicate<span class="token punctuation">,</span> prop<span class="token punctuation">)</span> <span class="token operator">=></span> obj <span class="token operator">=> !!</span><span class="token function">predicate</span><span class="token punctuation">(</span>obj<span class="token punctuation">[</span>prop<span class="token punctuation">]);</span>
</pre><label class="collapse">examples</label><pre class="section card-examples language-js">
<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>