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Update mask.md

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Angelos Chalaris
2018-01-01 14:39:25 +02:00
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### mask ### mask
Replaces all but the last `num` of characters (first if `num` is negative, by default `4`) with the provided mask character (`'*'` by default). Replaces all but the last `num` of characters with the specified mask character.
Use `String.slice()` to grab the portion of the characters that need to be masked and use `String.replace()` with a regex to replace every character with the mask character. Concatenate the masked characters with the remaining unmasked portion of the string. Use `String.slice()` to grab the portion of the characters that need to be masked and use `String.replace()` with a regex to replace every character with the mask character.
Concatenate the masked characters with the remaining unmasked portion of the string.
Omit the second argument, `num`, to keep a default of `4` characters unmasked.
Omit the third argument, `mask`, to use a default character of `'*'` for the mask.
```js ```js
const mask = (cc,num = 4,mask = '*') => const mask = (cc,num = 4,mask = '*') =>