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javascript/snippets/extend-hex.md

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+---
+title: Extend hex value
+type: snippet
+tags: [string]
+cover: red-mountain
+dateModified: 2020-09-15T16:28:04+03:00
+---
+
+Extends a 3-digit color code to a 6-digit color code.
+
+- Use `Array.prototype.map()`, `String.prototype.split()` and `Array.prototype.join()` to join the mapped array for converting a 3-digit RGB notated hexadecimal color-code to the 6-digit form.
+- `Array.prototype.slice()` is used to remove `#` from string start since it's added once.
+
+```js
+const extendHex = shortHex =>
+  '#' +
+  shortHex
+    .slice(shortHex.startsWith('#') ? 1 : 0)
+    .split('')
+    .map(x => x + x)
+    .join('');
+```
+
+```js
+extendHex('#03f'); // '#0033ff'
+extendHex('05a'); // '#0055aa'
+```