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Update mask.md

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atomiks
2018-01-01 22:06:24 +11:00
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### mask ### mask
It replace all but the last(first if `num` is negative) `num` (by default it is 4) characters by the provided mask(`'*'` by default). It replace all but the last `num` (first if `num` is negative, by default `4`) characters by the provided masking character (`'*'` by default).
```js ```js
const mask = (cc,num = 4,mask = '*') => const mask = (cc,num = 4,mask = '*') =>