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Update mask.md

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atomiks
2018-01-01 22:09:35 +11:00
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### mask ### mask
It replace all but the last `num` (first if `num` is negative, by default `4`) characters by the provided masking character (`'*'` by default). Replaces all but the last `num` of characters (first if `num` is negative, by default `4`) with the provided mask character (`'*'` by default).
Use `Array.slice()` to grab the portion of the characters that need to be masked and use `Array.replace()` with a regex to replace every character with the mask character. Concatenate the masked characters with the remaining unmasked portion of the string.
```js ```js
const mask = (cc,num = 4,mask = '*') => const mask = (cc,num = 4,mask = '*') =>