30-seconds-of-code
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A collection of useful JavaScript snippets.
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Markdown
### extendHex
Extends a 3-digit color code to a 6-digit color code.
Use `Array.map()`, `String.split()` and `Array.join()` to join the mapped array for converting a 3-digit RGB notated hexadecimal color-code to the 6-digit form.
`Array.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'
```