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+### 3DigHexcode to 6DigHexcode
+
+Use `Array.map()`, `split()` and `Array.join()` to join the mapped array for converting a three-digit RGB notated hexadecimal colorcode to the six-digit form. 
+
+```js
+const convertHex = shortHex => 
+  shortHex[0] == '#' ? ('#' + shortHex.slice(1).split('').map(x => x+x).join('')) : 
+    ('#' + shortHex.split('').map(x => x+x).join(''));
+// convertHex('#03f') -> '#0033ff'
+// convertHex('05a') -> '#0055aa'
+```