Create hexidecimal-to-RGB.md

snippets/hexidecimal-to-RGB.md

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+### Hexadecimal to RGB
+
+Converts hexadecimal colorcodes to RGB colorcodes by matching the hexidecimal (two-digit) red, green and blue values and 
+mapping their decimal equivalents to an array [r, g, b]. Works also with shorthand hex triplets such as "#05F".
+
+```js
+const hexToRgb = hex =>
+  hex.replace(/^#?([a-f\d])([a-f\d])([a-f\d])$/i
+             ,(m, r, g, b) => '#' + r + r + g + g + b + b)
+    .substring(1).match(/.{2}/g)
+    .map(x => parseInt(x, 16))
+// hexToRgb('#27ae60') -> '[39, 174, 96]'
+// hexToRgb('#aaa') -> '[170, 170, 170]'
+```