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Angelos Chalaris
2017-12-21 11:14:58 +02:00
parent 0788f976d4
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@ -83,6 +83,7 @@
<a class="sublink-1" href="#union">union</a>
<a class="sublink-1" href="#without">without</a>
<a class="sublink-1" href="#zip">zip</a>
<a class="sublink-1" href="#zipobject">zipObject</a>
<h3>Browser
</h3><a class="sublink-1" href="#arraytohtmllist">arrayToHtmlList</a>
@ -112,6 +113,7 @@
<h3>Math
</h3><a class="sublink-1" href="#arrayaverage">arrayAverage</a>
<a class="sublink-1" href="#arraysum">arraySum</a>
<a class="sublink-1" href="#clampnumber">clampNumber</a>
<a class="sublink-1" href="#collatz">collatz</a>
<a class="sublink-1" href="#digitize">digitize</a>
<a class="sublink-1" href="#distance">distance</a>
@ -119,6 +121,7 @@
<a class="sublink-1" href="#fibonacci">fibonacci</a>
<a class="sublink-1" href="#gcd">gcd</a>
<a class="sublink-1" href="#hammingdistance">hammingDistance</a>
<a class="sublink-1" href="#inrange">inRange</a>
<a class="sublink-1" href="#isarmstrongnumber">isArmstrongNumber</a>
<a class="sublink-1" href="#isdivisible">isDivisible</a>
<a class="sublink-1" href="#iseven">isEven</a>
@ -525,6 +528,13 @@ If lengths of the argument-arrays vary, <code>undefined</code> is used where no
//zip(['a', 'b'], [1, 2], [true, false]); -&gt; [['a', 1, true], ['b', 2, false]]
//zip(['a'], [1, 2], [true, false]); -&gt; [['a', 1, true], [undefined, 2, false]]
</code></pre>
</div></div><br/><div class="card fluid"><div class="section double-padded"><h3 id="zipobject">zipObject</h3></div><div class="section double-padded">
<p>Given an array of valid property identifiers and an array of values, return an object associating the properties to the values.</p>
<p>Since an object can have undefined values but not undefined property pointers, the array of properties is used to decide the structure of the resulting object using <code>Array.reduce()</code>.</p>
<pre><code class="language-js">const zipObject = ( props, values ) =&gt; props.reduce( ( obj, prop, index ) =&gt; ( obj[prop] = values[index], obj ), {} )
// zipObject(['a','b','c'], [1,2]) -&gt; {a: 1, b: 2, c: undefined}
// zipObject(['a','b'], [1,2,3]) -&gt; {a: 1, b: 2}
</code></pre>
</div></div><br/><h2 style="text-align:center;">Browser</h2>
<div class="card fluid"><div class="section double-padded"><h3 id="arraytohtmllist">arrayToHtmlList</h3></div><div class="section double-padded">
<p>Converts the given array elements into <code>&lt;li&gt;</code> tags and appends them to the list of the given id.</p>
@ -728,6 +738,19 @@ async function sleepyWork() {
<pre><code class="language-js">const arraySum = arr =&gt; arr.reduce((acc, val) =&gt; acc + val, 0);
// arraySum([1,2,3,4]) -&gt; 10
</code></pre>
</div></div><br/><div class="card fluid"><div class="section double-padded"><h3 id="clampnumber">clampNumber</h3></div><div class="section double-padded">
<p>Clamps <code>num</code> within the inclusive <code>lower</code> and <code>upper</code> bounds.</p>
<p>If <code>lower</code> is greater than <code>upper</code>, swap them.
If <code>num</code> falls within the range, return <code>num</code>.
Otherwise return the nearest number in the range.</p>
<pre><code class="language-js">const clampNumber = (num, lower, upper) =&gt; {
if(lower &gt; upper) upper = [lower, lower = upper][0];
return (num&gt;=lower &amp;&amp; num&lt;=upper) ? num : ((num &lt; lower) ? lower : upper)
}
// clampNumber(2, 3, 5) -&gt; 3
// clampNumber(1, -1, -5) -&gt; -1
// clampNumber(3, 2, 4) -&gt; 3
</code></pre>
</div></div><br/><div class="card fluid"><div class="section double-padded"><h3 id="collatz">collatz</h3></div><div class="section double-padded">
<p>Applies the Collatz algorithm.</p>
<p>If <code>n</code> is even, return <code>n/2</code>. Otherwise return <code>3n+1</code>.</p>
@ -783,6 +806,19 @@ Count and return the number of <code>1</code>s in the string, using <code>match(
((num1 ^ num2).toString(2).match(/1/g) || '').length;
// hammingDistance(2,3) -&gt; 1
</code></pre>
</div></div><br/><div class="card fluid"><div class="section double-padded"><h3 id="inrange">inRange</h3></div><div class="section double-padded">
<p>Checks if the given number falls in the given range.</p>
<p>Use arithmetic comparison to check if the given number is in the specified range.
If the second parameter, <code>end</code>, is not specified, the reange is considered to be from <code>0</code> to <code>start</code>.</p>
<pre><code class="language-js">const inRange = (n, start, end=null) =&gt; {
if(end &amp;&amp; start &gt; end) end = [start, start=end][0];
return (end == null) ? (n&gt;=0 &amp;&amp; n&lt;start) : (n&gt;=start &amp;&amp; n&lt;end);
}
// inRange(3, 2, 5) -&gt; true
// inRange(3, 4) -&gt; true
// inRange(2, 3, 5) -&gt; false
// inrange(3, 2) -&gt; false
</code></pre>
</div></div><br/><div class="card fluid"><div class="section double-padded"><h3 id="isarmstrongnumber">isArmstrongNumber</h3></div><div class="section double-padded">
<p>Checks if the given number is an armstrong number or not.</p>
<p>Convert the given number into array of digits. Use <code>Math.pow()</code> to get the appropriate power for each digit and sum them up. If the sum is equal to the number itself, return <code>true</code> otherwise <code>false</code>.</p>