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30secondsofcode
2018-10-07 18:55:31 +00:00
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@ -136,6 +136,11 @@
);
};</span>
</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token function">fibonacciUntilNum</span><span class="token punctuation">(</span><span class="token number">10</span><span class="token punctuation">);</span> <span class="token comment">// [ 0, 1, 1, 2, 3, 5, 8 ]</span>
</pre></div><div class="card code-card"><div class="section card-content"><h4 id="heronarea.md">heronArea</h4><p>Returns the area of a triangle using only the 3 side lengths, Heron's formula. Assumes that the sides define a valid triangle. Does NOT assume it is a right triangle.</p><p>More information on what Heron's formula is and why it works available here: https://en.wikipedia.org/wiki/Heron%27s_formula.</p><p>Uses <code>Math.sqrt()</code> to find the square root of a 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">heronArea</span> <span class="token operator">=</span> <span class="token punctuation">(</span>side_a<span class="token punctuation">,</span> side_b<span class="token punctuation">,</span> side_c<span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
<span class="token keyword">const</span> p <span class="token operator">=</span> <span class="token punctuation">(</span>side_a <span class="token operator">+</span> side_b <span class="token operator">+</span> side_c<span class="token punctuation">)</span> <span class="token operator">/</span> <span class="token number">2</span>
<span class="token keyword">return</span> Math<span class="token punctuation">.</span><span class="token function">sqrt</span><span class="token punctuation">(</span>p <span class="token operator">*</span> <span class="token punctuation">(</span>p<span class="token operator">-</span>side_a<span class="token punctuation">)</span> <span class="token operator">*</span> <span class="token punctuation">(</span>p<span class="token operator">-</span>side_b<span class="token punctuation">)</span> <span class="token operator">*</span> <span class="token punctuation">(</span>p<span class="token operator">-</span>side_c<span class="token punctuation">))
};</span>
</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token function">heronArea</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 number">5</span><span class="token punctuation">);</span> <span class="token comment">// 6</span>
</pre></div><div class="card code-card"><div class="section card-content"><h4 id="howmanytimes.md">howManyTimes</h4><p>Returns the number of times <code>num</code> can be divided by <code>divisor</code> (integer or fractional) without getting a fractional answer. Works for both negative and positive integers.</p><p>If <code>divisor</code> is <code>-1</code> or <code>1</code> return <code>Infinity</code>. If <code>divisor</code> is <code>-0</code> or <code>0</code> return <code>0</code>. Otherwise, keep dividing <code>num</code> with <code>divisor</code> and incrementing <code>i</code>, while the result is an integer. Return the number of times the loop was executed, <code>i</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">howManyTimes</span> <span class="token operator">=</span> <span class="token punctuation">(</span>num<span class="token punctuation">,</span> divisor<span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>divisor <span class="token operator">===</span> <span class="token number">1</span> <span class="token operator">||</span> divisor <span class="token operator">=== -</span><span class="token number">1</span><span class="token punctuation">)</span> <span class="token keyword">return</span> <span class="token number">Infinity</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>divisor <span class="token operator">===</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>