21 lines
436 B
Markdown
21 lines
436 B
Markdown
---
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title: isLowerCase
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tags: string,beginner
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firstSeen: 2018-01-06T11:16:05+02:00
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lastUpdated: 2020-10-20T11:21:07+03:00
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---
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Checks if a string is lower case.
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- Convert the given string to lower case, using `String.prototype.toLowerCase()` and compare it to the original.
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```js
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const isLowerCase = str => str === str.toLowerCase();
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```
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```js
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isLowerCase('abc'); // true
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isLowerCase('a3@$'); // true
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isLowerCase('Ab4'); // false
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```
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