16 lines
412 B
Markdown
16 lines
412 B
Markdown
### mask
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It replace all but the last(first if `num` is negative) `num` (by default it is 4) characters by the provided mask(`'*'` by default).
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```js
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const mask = (cc,num = 4,mask = '*') =>
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cc.slice(0, -num).replace(/./g, mask) + cc.slice(-num);
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```
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```js
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mask(1234567890) // '******7890'
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mask(1234567890,3) // '*******890'
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mask(1234567890,4,'$') // '$$$$$$7890'
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mask(1234567890,-4,'$') // '1234$$$$$$'
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```
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