Travis build: 659
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30secondsofcode
@ -126,9 +126,8 @@
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<span class="token keyword">const</span> <span class="token function-variable function">expectedScore</span> <span class="token operator">=</span> <span class="token punctuation">(</span>self<span class="token punctuation">,</span> opponent<span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token number">1</span> <span class="token operator">/</span> <span class="token punctuation">(</span><span class="token number">1</span> <span class="token operator">+</span> <span class="token number">10</span> <span class="token operator">**</span> <span class="token punctuation">((</span>opponent <span class="token operator">-</span> self<span class="token punctuation">)</span> <span class="token operator">/</span> <span class="token number">400</span><span class="token punctuation">));</span>
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<span class="token keyword">const</span> <span class="token function-variable function">newRating</span> <span class="token operator">=</span> <span class="token punctuation">(</span>rating<span class="token punctuation">,</span> i<span class="token punctuation">)</span> <span class="token operator">=></span>
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<span class="token punctuation">(</span>selfRating <span class="token operator">||</span> rating<span class="token punctuation">)</span> <span class="token operator">+</span> kFactor <span class="token operator">*</span> <span class="token punctuation">(</span>i <span class="token operator">-</span> <span class="token function">expectedScore</span><span class="token punctuation">(</span>i <span class="token operator">?</span> a <span class="token punctuation">:</span> b<span class="token punctuation">,</span> i <span class="token operator">?</span> b <span class="token punctuation">:</span> a<span class="token punctuation">));</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>ratings<span class="token punctuation">.</span>length <span class="token operator">===</span> <span class="token number">2</span><span class="token punctuation">) {</span>
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<span class="token keyword">return</span> <span class="token punctuation">[</span><span class="token function">newRating</span><span class="token punctuation">(</span>a<span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">),</span> <span class="token function">newRating</span><span class="token punctuation">(</span>b<span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">)];
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}</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>ratings<span class="token punctuation">.</span>length <span class="token operator">===</span> <span class="token number">2</span><span class="token punctuation">)</span> <span class="token keyword">return</span> <span class="token punctuation">[</span><span class="token function">newRating</span><span class="token punctuation">(</span>a<span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">),</span> <span class="token function">newRating</span><span class="token punctuation">(</span>b<span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">)];</span>
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<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">let</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">,</span> len <span class="token operator">=</span> ratings<span class="token punctuation">.</span>length<span class="token punctuation">;</span> i <span class="token operator"><</span> len<span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">) {</span>
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<span class="token keyword">let</span> j <span class="token operator">=</span> i<span class="token punctuation">;</span>
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<span class="token keyword">while</span> <span class="token punctuation">(</span>j <span class="token operator"><</span> len <span class="token operator">-</span> <span class="token number">1</span><span class="token punctuation">) {</span>
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@ -151,8 +150,8 @@ own individual rating by supplying it as the third argument.
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</pre></div><div class="card code-card"><div class="corner beginner"></div><div class="section card-content"><h4 id="factorial">factorial</h4><p>Calculates the factorial of a number.</p><p>Use recursion. If <code>n</code> is less than or equal to <code>1</code>, return <code>1</code>. Otherwise, return the product of <code>n</code> and the factorial of <code>n - 1</code>. Throws an exception if <code>n</code> is a negative number.</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">factorial</span> <span class="token operator">=</span> n <span class="token operator">=></span>
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n <span class="token operator"><</span> <span class="token number">0</span>
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<span class="token operator">?</span> <span class="token punctuation">(()</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
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<span class="token keyword">throw new</span> <span class="token class-name">TypeError</span><span class="token punctuation">(</span><span class="token string">'Negative numbers are not allowed!'</span><span class="token punctuation">);
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})()
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<span class="token keyword">throw new</span> <span class="token class-name">TypeError</span><span class="token punctuation">(</span><span class="token string">'Negative numbers are not allowed!'</span><span class="token punctuation">);
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})()
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:</span> n <span class="token operator"><=</span> <span class="token number">1</span>
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<span class="token operator">?</span> <span class="token number">1</span>
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<span class="token punctuation">:</span> n <span class="token operator">*</span> <span class="token function">factorial</span><span class="token punctuation">(</span>n <span class="token operator">-</span> <span class="token number">1</span><span class="token punctuation">);</span>
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@ -282,8 +281,8 @@ own individual rating by supplying it as the third argument.
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.</span><span class="token function">map</span><span class="token punctuation">((</span>x<span class="token punctuation">,</span> i<span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">(</span>i <span class="token operator">+</span> start<span class="token punctuation">)</span> <span class="token operator">**</span> power<span class="token punctuation">)
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.</span><span class="token function">reduce</span><span class="token punctuation">((</span>a<span class="token punctuation">,</span> b<span class="token punctuation">)</span> <span class="token operator">=></span> a <span class="token operator">+</span> b<span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">);</span>
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</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token function">sumPower</span><span class="token punctuation">(</span><span class="token number">10</span><span class="token punctuation">);</span> <span class="token comment">// 385</span>
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<span class="token function">sumPower</span><span class="token punctuation">(</span><span class="token number">10</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">);</span> <span class="token comment">//3025</span>
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<span class="token function">sumPower</span><span class="token punctuation">(</span><span class="token number">10</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token number">5</span><span class="token punctuation">);</span> <span class="token comment">//2925</span>
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<span class="token function">sumPower</span><span class="token punctuation">(</span><span class="token number">10</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">);</span> <span class="token comment">// 3025</span>
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<span class="token function">sumPower</span><span class="token punctuation">(</span><span class="token number">10</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token number">5</span><span class="token punctuation">);</span> <span class="token comment">// 2925</span>
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</pre></div><div class="card code-card"><div class="corner beginner"></div><div class="section card-content"><h4 id="tosafeinteger">toSafeInteger</h4><p>Converts a value to a safe integer.</p><p>Use <code>Math.max()</code> and <code>Math.min()</code> to find the closest safe value. Use <code>Math.round()</code> to convert to an integer.</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">toSafeInteger</span> <span class="token operator">=</span> num <span class="token operator">=></span>
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Math<span class="token punctuation">.</span><span class="token function">round</span><span class="token punctuation">(</span>Math<span class="token punctuation">.</span><span class="token function">max</span><span class="token punctuation">(</span>Math<span class="token punctuation">.</span><span class="token function">min</span><span class="token punctuation">(</span>num<span class="token punctuation">,</span> Number<span class="token punctuation">.</span><span class="token constant">MAX_SAFE_INTEGER</span><span class="token punctuation">),</span> Number<span class="token punctuation">.</span><span class="token constant">MIN_SAFE_INTEGER</span><span class="token punctuation">));</span>
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</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token function">toSafeInteger</span><span class="token punctuation">(</span><span class="token string">'3.2'</span><span class="token punctuation">);</span> <span class="token comment">// 3</span>
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