# isUpper {#isupper}

**Parent topic:**[Functions](../../Functions/category.md)

## Syntax {#syntax}

`isUpper(X)`

## Arguments {#arguments}

**X** is a STRING scalar or vector.

## Details {#details}

Check whether all the case-based characters \(letters\) of the string are uppercase.

## Examples {#examples}

```
isUpper("THIS IS STRING EXAMPLE....WOW!!!");
// output: true

isUpper("THIS is string example....wow!!!");
// output: false

isUpper("123456ABC");
// output: true

isUpper("123");
// output: false

isUpper(["  ",string()]);
// output: [false,false]
```

Related functions: [isLower](isLower.md), [isTitle](isTitle.md)

