> For the complete documentation index, see [llms.txt](https://boxlang.ortusbooks.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://boxlang.ortusbooks.com/boxlang-language/reference/built-in-functions/array/arrayindexexists.md).

# ArrayIndexExists

Returns whether there exists an item in the array at the selected index.

## Method Signature

```
ArrayIndexExists(array=[array], index=[any])
```

### Arguments

| Argument | Type    | Required | Description               | Default |
| -------- | ------- | -------- | ------------------------- | ------- |
| `array`  | `array` | `true`   | The array to be searched. |         |
| `index`  | `any`   | `true`   | The index to check.       |         |

## Examples

### Simple example

To check an array element is define or not

[Run Example](https://try.boxlang.io/?code=eJwrzs9NdSwqSqxUsFWIVuDiNNTh4jQCYmMgNgFiU65Ya67yosySVP%2FSkoLSEg2FRJBqz2KX1LTMvNQUDYVimAk6CsYKmgqa1lwAtkgXRQ%3D%3D)

```java
someArray = [ 
	1,
	2,
	3,
	4,
	5
];
writeOutput( arrayIsDefined( someArray, 3 ) );

```

Result: Yes

### Simple example

To check an array element is define or not

[Run Example](https://try.boxlang.io/?code=eJwrzs9NdSwqSqxUsFWIVuDiNNTh4jQCYmMgNgFiU65Ya67yosySVP%2FSkoLSEg2FRJBqz2KX1LTMvNQUDYVimAk6CmYKmgqa1lwAtl0XSA%3D%3D)

```java
someArray = [ 
	1,
	2,
	3,
	4,
	5
];
writeOutput( arrayIsDefined( someArray, 6 ) );

```

Result: false

### Simple example with two dimensional array

To check an array element is define or not

[Run Example](https://try.boxlang.io/?code=eJxzyywqLnEsKkqsVLBViFbg4jTU4eI0AmJjrlhrruLU5Py8FLg0UBYkbQiSNwQrSM7PTcrMS4WpSATRfqnlGgpGCprWXGCuY0FBal6KhgKyUh2FNIS9%2BBUiOwGosrwosyTVv7SkoLREA2KdZ7FLahpQPYZOYwVNkA4AntpGyg%3D%3D)

```java
FirstArray = [ 
	1,
	2,
	3
];
secondArray = [
	11,
	12,
	13
];
combineArray = arrayNew( 2 );
arrayAppend( combineArray, firstArray );
arrayAppend( combineArray, secondArray );
writeOutput( arrayIsDefined( combineArray, 3 ) );

```

Result: No

### Simple example with two dimensional array

To check an array element is define or not

[Run Example](https://try.boxlang.io/?code=eJxzyywqLnEsKkqsVLBViFbg4jTU4eI0AmJjrlhrruLU5Py8FLg0UBYkbQiSNwQrSM7PTcrMS4WpSATRfqnlGgpGCprWXGCuY0FBal6KhgKyUh2FNIS9%2BBUiOwGosrwosyTVv7SkoLREA2KdZ7FLahpQPYZOoBNAOgCe00bJ)

```java
FirstArray = [ 
	1,
	2,
	3
];
secondArray = [
	11,
	12,
	13
];
combineArray = arrayNew( 2 );
arrayAppend( combineArray, firstArray );
arrayAppend( combineArray, secondArray );
writeOutput( arrayIsDefined( combineArray, 2 ) );

```

Result: true

### Additional Examples

[Run Example](https://try.boxlang.io/?code=eJxFjcEKwjAMhs%2FmKcJOGwwn7Dg8CF58BvGQuVSCa1eyFvHt7apYcsgHf74%2FRqOEkyq98YhXhF1F3s9ctYme8pIMI7k0GRcl9%2FjGNtFSDuE2wBStr5G2ust6ZiOOpxrN%2F0eLPTbYDNh1GDQypG3ZjqxoorsHWdyvozh7KU39Ieuw%2BYbmleEDVd85ZQ%3D%3D)

```java
fruitArray = [ 
	"apple",
	"kiwi",
	"banana",
	"orange",
	"mango",
	"kiwi"
];
dump( arrayIsDefined( fruitArray, 3 ) ); // true
// member function
dump( fruitArray.isDefined( 30 ) );
 // false

```

## Related

* [ArrayAppend](/boxlang-language/reference/built-in-functions/array/arrayappend.md)
* [ArrayAvg](/boxlang-language/reference/built-in-functions/array/arrayavg.md)
* [ArrayChunk](/boxlang-language/reference/built-in-functions/array/arraychunk.md)
* [ArrayClear](/boxlang-language/reference/built-in-functions/array/arrayclear.md)
* [ArrayContains](/boxlang-language/reference/built-in-functions/array/arraycontains.md)
* [ArrayContainsNoCase](/boxlang-language/reference/built-in-functions/array/arraycontainsnocase.md)
* [ArrayDelete](/boxlang-language/reference/built-in-functions/array/arraydelete.md)
* [ArrayDeleteAt](/boxlang-language/reference/built-in-functions/array/arraydeleteat.md)
* [ArrayDeleteNoCase](/boxlang-language/reference/built-in-functions/array/arraydeletenocase.md)
* [ArrayEach](/boxlang-language/reference/built-in-functions/array/arrayeach.md)
* [ArrayEvery](/boxlang-language/reference/built-in-functions/array/arrayevery.md)
* [ArrayFilter](/boxlang-language/reference/built-in-functions/array/arrayfilter.md)
* [ArrayFind](/boxlang-language/reference/built-in-functions/array/arrayfind.md)
* [ArrayFindAll](/boxlang-language/reference/built-in-functions/array/arrayfindall.md)
* [ArrayFindAllNoCase](/boxlang-language/reference/built-in-functions/array/arrayfindallnocase.md)
* [ArrayFindFirst](/boxlang-language/reference/built-in-functions/array/arrayfindfirst.md)
* [ArrayFindNoCase](/boxlang-language/reference/built-in-functions/array/arrayfindnocase.md)
* [ArrayFirst](/boxlang-language/reference/built-in-functions/array/arrayfirst.md)
* [ArrayFlatMap](/boxlang-language/reference/built-in-functions/array/arrayflatmap.md)
* [ArrayFlatten](/boxlang-language/reference/built-in-functions/array/arrayflatten.md)
* [ArrayGetMetadata](/boxlang-language/reference/built-in-functions/array/arraygetmetadata.md)
* [ArrayGroupBy](/boxlang-language/reference/built-in-functions/array/arraygroupby.md)
* [ArrayInsertAt](/boxlang-language/reference/built-in-functions/array/arrayinsertat.md)
* [ArrayIsDefined](/boxlang-language/reference/built-in-functions/array/arrayisdefined.md)
* [ArrayLast](/boxlang-language/reference/built-in-functions/array/arraylast.md)
* [ArrayMap](/boxlang-language/reference/built-in-functions/array/arraymap.md)
* [ArrayMax](/boxlang-language/reference/built-in-functions/array/arraymax.md)
* [ArrayMedian](/boxlang-language/reference/built-in-functions/array/arraymedian.md)
* [ArrayMerge](/boxlang-language/reference/built-in-functions/array/arraymerge.md)
* [ArrayMid](/boxlang-language/reference/built-in-functions/array/arraymid.md)
* [ArrayMin](/boxlang-language/reference/built-in-functions/array/arraymin.md)
* [ArrayNew](/boxlang-language/reference/built-in-functions/array/arraynew.md)
* [ArrayNone](/boxlang-language/reference/built-in-functions/array/arraynone.md)
* [ArrayPop](/boxlang-language/reference/built-in-functions/array/arraypop.md)
* [ArrayPrepend](/boxlang-language/reference/built-in-functions/array/arrayprepend.md)
* [ArrayPush](/boxlang-language/reference/built-in-functions/array/arraypush.md)
* [ArrayRange](/boxlang-language/reference/built-in-functions/array/arrayrange.md)
* [ArrayReduce](/boxlang-language/reference/built-in-functions/array/arrayreduce.md)
* [ArrayReduceRight](/boxlang-language/reference/built-in-functions/array/arrayreduceright.md)
* [ArrayReject](/boxlang-language/reference/built-in-functions/array/arrayreject.md)
* [ArrayResize](/boxlang-language/reference/built-in-functions/array/arrayresize.md)
* [ArrayReverse](/boxlang-language/reference/built-in-functions/array/arrayreverse.md)
* [ArraySet](/boxlang-language/reference/built-in-functions/array/arrayset.md)
* [ArrayShift](/boxlang-language/reference/built-in-functions/array/arrayshift.md)
* [ArraySlice](/boxlang-language/reference/built-in-functions/array/arrayslice.md)
* [ArraySome](/boxlang-language/reference/built-in-functions/array/arraysome.md)
* [ArraySort](/boxlang-language/reference/built-in-functions/array/arraysort.md)
* [ArraySplice](/boxlang-language/reference/built-in-functions/array/arraysplice.md)
* [ArraySum](/boxlang-language/reference/built-in-functions/array/arraysum.md)
* [ArraySwap](/boxlang-language/reference/built-in-functions/array/arrayswap.md)
* [ArrayToList](/boxlang-language/reference/built-in-functions/array/arraytolist.md)
* [ArrayToStruct](/boxlang-language/reference/built-in-functions/array/arraytostruct.md)
* [ArrayTranspose](/boxlang-language/reference/built-in-functions/array/arraytranspose.md)
* [ArrayUnique](/boxlang-language/reference/built-in-functions/array/arrayunique.md)
* [ArrayUnshift](/boxlang-language/reference/built-in-functions/array/arrayunshift.md)
* [ArrayZip](/boxlang-language/reference/built-in-functions/array/arrayzip.md)


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://boxlang.ortusbooks.com/boxlang-language/reference/built-in-functions/array/arrayindexexists.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.