Merge branch 'master' of https://github.com/Chalarangelo/30-seconds-of-code

.travis/push.sh

@@ -12,6 +12,7 @@ commit_website_files() {
 }
 
 upload_files() {
+  echo "https://${GH_TOKEN}@github.com/Chalarangelo/30-seconds-of-code.git"
   git push --force "https://${GH_TOKEN}@github.com/Chalarangelo/30-seconds-of-code.git" master > /dev/null 2>&1
 }
 

README.md

@@ -12,6 +12,7 @@
 
 ### Array
 * [`arrayGcd`](#arraygcd)
+* [`arrayLcm`](#arraylcm)
 * [`arrayMax`](#arraymax)
 * [`arrayMin`](#arraymin)
 * [`chunk`](#chunk)
@@ -150,6 +151,7 @@
 * [`isSymbol`](#issymbol)
 * [`RGBToHex`](#rgbtohex)
 * [`timeTaken`](#timetaken)
+* [`toDecimalMark`](#todecimalmark)
 * [`toOrdinalSuffix`](#toordinalsuffix)
 * [`UUIDGenerator`](#uuidgenerator)
 * [`validateEmail`](#validateemail)
@@ -174,6 +176,24 @@ const arrayGcd = arr =>{
 
 [⬆ back to top](#table-of-contents)
 
+### arrayLcm
+
+Calculates the lowest  common multiple  (lcm) of an array of numbers.
+
+Use `Array.reduce()` and the `lcm` formula (uses recursion) to calculate the lowest  common multiple  of an array of numbers.
+
+```js
+const arrayLcm = arr =>{
+  const gcd = (x, y) => !y ? x : gcd(y, x % y);
+  const lcm = (x, y) => (x*y)/gcd(x, y) 
+  return arr.reduce((a,b) => lcm(a,b));
+}
+// arrayLcm([1,2,3,4,5]) -> 60
+// arrayLcm([4,8,12]) -> 24
+```
+
+[⬆ back to top](#table-of-contents)
+
 ### arrayMax
 
 Returns the maximum value in an array.
@@ -2091,6 +2111,26 @@ const timeTaken = callback => {
 
 [⬆ back to top](#table-of-contents)
 
+### toDecimalMark
+
+Convert a float-point arithmetic to the [Decimal mark](https://en.wikipedia.org/wiki/Decimal_mark) form.
+
+Use `toString()` to convert the float `num` to a string, then use regex to separate every three characters of the integer part with a comma.
+
+ ```js
+const toDecimalMark = (num) => {
+  let cleanNum = num.toString().split('').filter(n => '0123456789.'.includes(n)).join('') 
+  let wholeNum = cleanNum.split('.')[0].replace(/\B(?=(\d{3})+(?!\d))/g, ",")
+  let decNum = `.${cleanNum.split('.')[1]}`
+  return wholeNum + decNum;
+}
+// toDecimalMark(12305030388.9087) //-> '12,305,030,388.9087'
+// toDecimalMark(123.889087e2) //-> '12,388.9087'
+// toDecimalMark('12305abc030388.9087') // -> '12,305,030,388.9087'
+```
+
+[⬆ back to top](#table-of-contents)
+
 ### toOrdinalSuffix
 
 Adds an ordinal suffix to a number.

docs/index.html

@@ -43,6 +43,7 @@
 
 <h3>Array
 </h3><a class="sublink-1" href="#arraygcd">arrayGcd</a>
+<a class="sublink-1" href="#arraylcm">arrayLcm</a>
 <a class="sublink-1" href="#arraymax">arrayMax</a>
 <a class="sublink-1" href="#arraymin">arrayMin</a>
 <a class="sublink-1" href="#chunk">chunk</a>
@@ -181,6 +182,7 @@
 <a class="sublink-1" href="#issymbol">isSymbol</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>
 <a class="sublink-1" href="#toordinalsuffix">toOrdinalSuffix</a>
 <a class="sublink-1" href="#uuidgenerator">UUIDGenerator</a>
 <a class="sublink-1" href="#validateemail">validateEmail</a>
@@ -197,6 +199,17 @@
 // arrayGcd([1,2,3,4,5]) -&gt; 1
 // arrayGcd([4,8,12]) -&gt; 4
 </code></pre>
+</div></div><br/><div class="card fluid"><div class="section double-padded"><h3 id="arraylcm">arrayLcm</h3></div><div class="section double-padded">
+<p>Calculates the lowest  common multiple  (lcm) of an array of numbers.</p>
+<p>Use <code>Array.reduce()</code> and the <code>lcm</code> formula (uses recursion) to calculate the lowest  common multiple  of an array of numbers.</p>
+<pre><code class="language-js">const arrayLcm = arr =&gt;{
+  const gcd = (x, y) =&gt; !y ? x : gcd(y, x % y);
+  const lcm = (x, y) =&gt; (x*y)/gcd(x, y) 
+  return arr.reduce((a,b) =&gt; lcm(a,b));
+}
+// arrayLcm([1,2,3,4,5]) -&gt; 60
+// arrayLcm([4,8,12]) -&gt; 24
+</code></pre>
 </div></div><br/><div class="card fluid"><div class="section double-padded"><h3 id="arraymax">arrayMax</h3></div><div class="section double-padded">
 <p>Returns the maximum value in an array.</p>
 <p>Use <code>Math.max()</code> combined with the spread operator (<code>...</code>) to get the maximum value in the array.</p>
@@ -1270,6 +1283,19 @@ Omit the second argument to use the default regex.</p>
 // timeTaken(() =&gt; Math.pow(2, 10)) -&gt; 1024
 // (logged): timeTaken: 0.02099609375ms
 </code></pre>
+</div></div><br/><div class="card fluid"><div class="section double-padded"><h3 id="todecimalmark">toDecimalMark</h3></div><div class="section double-padded">
+<p>Convert a float-point arithmetic to the <a href="https://en.wikipedia.org/wiki/Decimal_mark">Decimal mark</a> form.</p>
+<p>Use <code>toString()</code> to convert the float <code>num</code> to a string, then use regex to separate every three characters of the integer part with a comma.</p>
+<pre><code class="language-js">const toDecimalMark = (num) =&gt; {
+ let cleanNum = num.toString().split('').filter(n =&gt; '0123456789.'.includes(n)).join('') 
+ let wholeNum = cleanNum.split('.')[0].replace(/\B(?=(\d{3})+(?!\d))/g, &quot;,&quot;)
+ let decNum = `.${cleanNum.split('.')[1]}`
+ return wholeNum + decNum;
+}
+// toDecimalMark(12305030388.9087) //-&gt; '12,305,030,388.9087'
+// toDecimalMark(123.889087e2) //-&gt; '12,388.9087'
+// toDecimalMark('12305abc030388.9087') // -&gt; '12,305,030,388.9087'
+</code></pre>
 </div></div><br/><div class="card fluid"><div class="section double-padded"><h3 id="toordinalsuffix">toOrdinalSuffix</h3></div><div class="section double-padded">
 <p>Adds an ordinal suffix to a number.</p>
 <p>Use the modulo operator (<code>%</code>) to find values of single and tens digits.

snippets/arrayLcm.md

@@ -0,0 +1,15 @@
+### arrayLcm
+
+Calculates the lowest  common multiple  (lcm) of an array of numbers.
+
+Use `Array.reduce()` and the `lcm` formula (uses recursion) to calculate the lowest  common multiple  of an array of numbers.
+
+```js
+const arrayLcm = arr =>{
+  const gcd = (x, y) => !y ? x : gcd(y, x % y);
+  const lcm = (x, y) => (x*y)/gcd(x, y) 
+  return arr.reduce((a,b) => lcm(a,b));
+}
+// arrayLcm([1,2,3,4,5]) -> 60
+// arrayLcm([4,8,12]) -> 24
+```

tag_database

@@ -1,6 +1,7 @@
 anagrams:string
 arrayAverage:math
 arrayGcd:array
+arrayLcm:array
 arrayMax:array
 arrayMin:array
 arraySum:math