27 lines
685 B
Markdown
27 lines
685 B
Markdown
---
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title: Check yes/no string
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tags: string,regexp
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expertise: intermediate
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unlisted: true
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cover: blog_images/mask-quiet.jpg
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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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