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