Function mask

mask(str: string, num??: number, replaceValue??: string): string
Replaces all but the last num of characters with the specified mask character

Example
```
mask('1234567890'); // '******7890'
```
Example
```
mask('1234567890', 3); // '*******890'
```
Example
```
mask('1234567890', -4, '$'); // '$$$$567890'
```
Parameters
- str: string
- Optional num: number = 4
- Optional replaceValue: string = "*"
Returns string
- Defined in string/mask/index.ts:13

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