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@ -78,6 +78,7 @@
</h3><a class="sublink-1" href="#call">call</a>
<a class="sublink-1" href="#collectinto">collectInto</a>
<a class="sublink-1" href="#flip">flip</a>
<a class="sublink-1" href="#pipefunctions">pipeFunctions</a>
<a class="sublink-1" href="#promisify">promisify</a>
<a class="sublink-1" href="#spreadover">spreadOver</a>
@ -182,6 +183,7 @@
<a class="sublink-1" href="#randomintegerinrange">randomIntegerInRange</a>
<a class="sublink-1" href="#randomnumberinrange">randomNumberInRange</a>
<a class="sublink-1" href="#round">round</a>
<a class="sublink-1" href="#sdbmhashalgorithm">sdbmHashAlgorithm</a>
<a class="sublink-1" href="#standarddeviation">standardDeviation</a>
<h3>Media
@ -228,6 +230,7 @@
<a class="sublink-1" href="#isnumber">isNumber</a>
<a class="sublink-1" href="#isstring">isString</a>
<a class="sublink-1" href="#issymbol">isSymbol</a>
<a class="sublink-1" href="#randomhexcolor">randomHexColor</a>
<a class="sublink-1" href="#rgbtohex">RGBToHex</a>
<a class="sublink-1" href="#timetaken">timeTaken</a>
<a class="sublink-1" href="#todecimalmark">toDecimalMark</a>
@ -235,11 +238,6 @@
<a class="sublink-1" href="#uuidgenerator">UUIDGenerator</a>
<a class="sublink-1" href="#validatenumber">validateNumber</a>
<h3>Uncategorized
</h3><a class="sublink-1" href="#pipefunctions">pipeFunctions</a>
<a class="sublink-1" href="#randomhexcolor">randomHexColor</a>
<a class="sublink-1" href="#sdbmhashalgorithm">sdbmHashAlgorithm</a>
</nav><main class="col-sm-12 col-md-8 col-lg-9" style="height:100%;overflow-y:auto;background:#eceef2;padding:0"><a id="top">&nbsp;</a><h2 style="text-align:center">Adapter</h2>
<div class="card fluid"><div class="section double-padded"><h3 id="call">call</h3></div><div class="section double-padded">
<p>Given a key and a set of arguments, call them when given a context. Primarily useful in composition.</p>
@ -277,6 +275,18 @@ b = {}
Object.assign(b, a) // == b
*/
</code></pre>
</div></div><br/><div class="card fluid"><div class="section double-padded"><h3 id="pipefunctions">pipeFunctions</h3></div><div class="section double-padded">
<p>Performs left-to-right function composition.</p>
<p>Use <code>Array.reduce()</code> with the spread operator (<code>...</code>) to perform left-to-right function composition.
The first (leftmost) function can accept one or more arguments; the remaining functions must be unary.</p>
<pre><code class="language-js">const pipeFunctions = (...fns) =&gt; fns.reduce((f, g) =&gt; (...args) =&gt; g(f(...args)));
/*
const add5 = x =&gt; x + 5
const multiply = (x, y) =&gt; x * y
const multiplyAndAdd5 = pipeFunctions(multiply, add5)
multiplyAndAdd5(5, 2) -&gt; 15
*/
</code></pre>
</div></div><br/><div class="card fluid"><div class="section double-padded"><h3 id="promisify">promisify</h3></div><div class="section double-padded">
<p>Converts an asynchronous function to return a promise.</p>
<p>Use currying to return a function returning a <code>Promise</code> that calls the original function.
@ -1089,6 +1099,18 @@ Omit the second argument, <code>decimals</code> to round to an integer.</p>
<pre><code class="language-js">const round = (n, decimals=0) =&gt; Number(`${Math.round(`${n}e${decimals}`)}e-${decimals}`);
// round(1.005, 2) -&gt; 1.01
</code></pre>
</div></div><br/><div class="card fluid"><div class="section double-padded"><h3 id="sdbmhashalgorithm">sdbmHashAlgorithm</h3></div><div class="section double-padded">
<p>This algorithm is a simple hash-algorithm that hashes it input string <code>s</code> into a whole number.</p>
<p>Use <code>split('')</code> and <code>Array.reduce()</code> to create a hash of the input string, utilizing bit shifting.</p>
<pre><code class="language-js">const sdbm = str =&gt; {
let arr = str.split('');
return arr.reduce((hashCode, currentVal) =&gt;
hashCode = currentVal.charCodeAt(0) + (hashCode &lt;&lt; 6) + (hashCode &lt;&lt; 16) - hashCode
,0)
}
// console.log(sdbm(&quot;name&quot;)) // -3521204949
// console.log(sdbm(&quot;age&quot;)) // 808122783
</code></pre>
</div></div><br/><div class="card fluid"><div class="section double-padded"><h3 id="standarddeviation">standardDeviation</h3></div><div class="section double-padded">
<p>Returns the standard deviation of an array of numbers.</p>
<p>Use <code>Array.reduce()</code> to calculate the mean, variance and the sum of the variance of the values, the variance of the values, then
@ -1154,12 +1176,12 @@ Also if you give it a special key (<code>childIndicator</code>) it will search d
} else if (!keysToKeep.includes(key)) {
delete obj[key];
}
})
 });
return obj;
}
/*
const testObj = {a: 1, b: 2, children: {a: 1, b: 2}}
cleanObj(testObj, [&quot;a&quot;],&quot;children&quot;)
console.log(testObj)// { a: 1, children : { a: 1}}
cleanObj(testObj, [&quot;a&quot;],&quot;children&quot;) // { a: 1, children : { a: 1}}
*/
</code></pre>
</div></div><br/><div class="card fluid"><div class="section double-padded"><h3 id="objectfrompairs">objectFromPairs</h3></div><div class="section double-padded">
@ -1448,6 +1470,18 @@ Omit the second argument to use the default regex.</p>
// isSymbol('x') -&gt; false
// isSymbol(Symbol('x')) -&gt; true
</code></pre>
</div></div><br/><div class="card fluid"><div class="section double-padded"><h3 id="randomhexcolor">randomHexColor</h3></div><div class="section double-padded">
<p>Generates a random hexadecimal color code.</p>
<p>Use <code>Math.random</code> to generate a random 24-bit(6x4bits) hexadecimal number. Use bit shifting and then convert it to an hexadecimal String using <code>toString(16)</code>.</p>
<pre><code class="language-js">const randomHexColor = () =&gt; {
let n = (Math.random()*0xfffff|0).toString(16);
return '#' + (n.length !== 6
? (Math.random()*0xf|0).toString(16) + n : n);
}
// randomHexColorCode() -&gt; &quot;#e34155&quot;
// randomHexColorCode() -&gt; &quot;#fd73a6&quot;
// randomHexColorCode() -&gt; &quot;#4144c6&quot;
</code></pre>
</div></div><br/><div class="card fluid"><div class="section double-padded"><h3 id="rgbtohex">RGBToHex</h3></div><div class="section double-padded">
<p>Converts the values of RGB components to a color code.</p>
<p>Convert given RGB parameters to hexadecimal string using bitwise left-shift operator (<code>&lt;&lt;</code>) and <code>toString(16)</code>, then <code>padStart(6,'0')</code> to get a 6-digit hexadecimal value.</p>
@ -1499,43 +1533,6 @@ Use <code>Number()</code> to check if the coercion holds.</p>
<pre><code class="language-js">const validateNumber = n =&gt; !isNaN(parseFloat(n)) &amp;&amp; isFinite(n) &amp;&amp; Number(n) == n;
// validateNumber('10') -&gt; true
</code></pre>
</div></div><br/><h2 style="text-align:center">Uncategorized</h2>
<div class="card fluid"><div class="section double-padded"><h3 id="pipefunctions">pipeFunctions</h3></div><div class="section double-padded">
<p>Performs left-to-right function composition.</p>
<p>Use <code>Array.reduce()</code> with the spread operator (<code>...</code>) to perform left-to-right function composition.
The first (leftmost) function can accept one or more arguments; the remaining functions must be unary.</p>
<pre><code class="language-js">const pipeFunctions = (...fns) =&gt; fns.reduce((f, g) =&gt; (...args) =&gt; g(f(...args)));
/*
const add5 = x =&gt; x + 5
const multiply = (x, y) =&gt; x * y
const multiplyAndAdd5 = pipeFunctions(multiply, add5)
multiplyAndAdd5(5, 2) -&gt; 15
*/
</code></pre>
</div></div><br/><div class="card fluid"><div class="section double-padded"><h3 id="randomhexcolor">randomHexColor</h3></div><div class="section double-padded">
<p>Generates a random hexadecimal color code.</p>
<p>Use <code>Math.random</code> to generate a random 24-bit(6x4bits) hexadecimal number. Use bit shifting and then convert it to an hexadecimal String using <code>toString(16)</code>.</p>
<pre><code class="language-js">const randomHexColor = () =&gt; {
let n = (Math.random()*0xfffff|0).toString(16);
return '#' + (n.length !== 6
? (Math.random()*0xf|0).toString(16) + n : n);
}
// randomHexColorCode() -&gt; &quot;#e34155&quot;
// randomHexColorCode() -&gt; &quot;#fd73a6&quot;
// randomHexColorCode() -&gt; &quot;#4144c6&quot;
</code></pre>
</div></div><br/><div class="card fluid"><div class="section double-padded"><h3 id="sdbmhashalgorithm">sdbmHashAlgorithm</h3></div><div class="section double-padded">
<p>This algorithm is a simple hash-algorithm that hashes it input string <code>s</code> into a whole number.</p>
<p>Use <code>split('')</code> and <code>Array.reduce()</code> to create a hash of the input string, utilizing bit shifting.</p>
<pre><code class="language-js">const sdbm = str =&gt; {
let arr = str.split('');
return arr.reduce((hashCode, currentVal) =&gt;
hashCode = currentVal.charCodeAt(0) + (hashCode &lt;&lt; 6) + (hashCode &lt;&lt; 16) - hashCode
,0)
}
// console.log(sdbm(&quot;name&quot;)) // -3521204949
// console.log(sdbm(&quot;age&quot;)) // 808122783
</code></pre>
</div></div><br/>
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<p style="display:inline-block"><strong>30 seconds of code</strong> is licensed under the <a href="https://github.com/Chalarangelo/30-seconds-of-code/blob/master/LICENSE">CC0-1.0</a> license.<br/>Icons made by <a href="https://www.flaticon.com/authors/smashicons">Smashicons</a> from <a href="https://www.flaticon.com/">www.flaticon.com</a> is licensed by <a href="http://creativecommons.org/licenses/by/3.0/">CC 3.0 BY</a>.<br/>Ribbon made by <a href="https://github.com/tholman/github-corners">Tim Holman</a> is licensed by <a href="https://opensource.org/licenses/MIT">The MIT License</a><br/>Built with the <a href="https://minicss.org">mini.css framework</a>.</p>