21 lines
796 B
Markdown
21 lines
796 B
Markdown
### mask
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Replaces all but the last `num` of characters with the specified mask character.
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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.
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Concatenate the masked characters with the remaining unmasked portion of the string.
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Omit the second argument, `num`, to keep a default of `4` characters unmasked.
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Omit the third argument, `mask`, to use a default character of `'*'` for the mask.
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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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