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66 lines
1.4 KiB
Markdown
66 lines
1.4 KiB
Markdown
---
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id: 68cae5b538ff798bbd4da006
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title: "Challenge 68: Credit Card Masker"
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challengeType: 28
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dashedName: challenge-68
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---
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# --description--
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Given a string of credit card numbers, return a masked version of it using the following constraints:
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- The string will contain four sets of four digits (`0-9`), with all sets being separated by a single space, or a single hyphen (`-`).
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- Replace all numbers, except the last four, with an asterisk (`*`).
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- Leave the remaining characters unchanged.
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For example, given `"4012-8888-8888-1881"` return `"****-****-****-1881"`.
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# --hints--
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`mask("4012-8888-8888-1881")` should return `"****-****-****-1881"`.
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```js
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assert.equal(mask("4012-8888-8888-1881"), "****-****-****-1881");
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```
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`mask("5105 1051 0510 5100")` should return `"**** **** **** 5100"`.
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```js
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assert.equal(mask("5105 1051 0510 5100"), "**** **** **** 5100");
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```
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`mask("6011 1111 1111 1117")` should return `"**** **** **** 1117"`.
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```js
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assert.equal(mask("6011 1111 1111 1117"), "**** **** **** 1117");
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```
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`mask("2223-0000-4845-0010")` should return `"****-****-****-0010"`.
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```js
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assert.equal(mask("2223-0000-4845-0010"), "****-****-****-0010");
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```
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# --seed--
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## --seed-contents--
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```js
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function mask(card) {
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return card;
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}
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```
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# --solutions--
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```js
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function mask(card) {
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const split = card.split(card.includes('-') ? '-' : ' ');
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return card.includes('-') ?
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`****-****-****-${split[3]}` :
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`**** **** **** ${split[3]}`;
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}
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```
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