# 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)


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