andre/30-seconds-of-code
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Merge pull request #751 from Theomg/master

Browse Source 
[ENHANCEMENT] Simpler solution to mask using padStart
This commit is contained in:
Angelos Chalaris
2018-09-26 12:27:33 +03:00
committed by GitHub
parent 2bdda5eac8 e2a1310db1
commit f26818b4d6
2 changed files with 3 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
snippets/mask.md
View File

@ -2,14 +2,12 @@
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 regexp 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 will remain unmasked and use `String.padStart()` to fill the beginning of the string with the mask character up to the original length.
Omit the second argument, `num`, to keep a default of `4` characters unmasked. If `num` is negative, the unmasked characters will be at the start of the string.
Omit the third argument, `mask`, to use a default character of `'*'` for the mask.
```js
const mask = (cc, num = 4, mask = '*') =>
('' + cc).slice(0, -num).replace(/./g, mask) + ('' + cc).slice(-num);
const mask = (cc, num = 4, mask = '*') => `${cc}`.slice(-num).padStart(`${cc}`.length, mask);
```
```js