19 lines
358 B
Markdown
19 lines
358 B
Markdown
---
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title: isUpperCase
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tags: string,beginner
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---
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Checks if a string is upper case.
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Convert the given string to upper case, using `String.prototype.toUpperCase()` and compare it to the original.
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```js
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const isUpperCase = str => str === str.toUpperCase();
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```
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```js
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isUpperCase('ABC'); // true
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isUpperCase('A3@$'); // true
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isUpperCase('aB4'); // false
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```
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