25 lines
604 B
Markdown
25 lines
604 B
Markdown
---
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title: yesNo
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tags: string,regexp,intermediate
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unlisted: true
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firstSeen: 2017-12-30T18:35:54+02:00
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lastUpdated: 2021-01-04T13:04:15+02:00
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---
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Returns `true` if the string is `y`/`yes` or `false` if the string is `n`/`no`.
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- Use `RegExp.prototype.test()` to check if the string evaluates to `y/yes` or `n/no`.
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- Omit the second argument, `def` to set the default answer as `no`.
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```js
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const yesNo = (val, def = false) =>
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/^(y|yes)$/i.test(val) ? true : /^(n|no)$/i.test(val) ? false : def;
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```
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```js
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yesNo('Y'); // true
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yesNo('yes'); // true
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yesNo('No'); // false
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yesNo('Foo', true); // true
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```
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