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ArrayInsertAt

Last updated on May 30, 2024 | Also applies to ColdFusion

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Description

Inserts a value into an array. Array elements whose indexes are equal to or greater than the new position are incremented by one. The array length increases by one.

Returns

Returns the updated array with the specified element inserted.

Function syntax

ArrayInsertAt(array, position, value)

History

ColdFusion (2018 release): Returns the updated array.

ColdFusion MX:

Changed behavior: This function can be used on XML objects.
Changed thrown exceptions: This function can throw the InvalidArrayIndexException error.

Parameters

Parameter	Description
array	Name of an array
position	Index position at which to insert value
value	Value to insert

Usage

To apply the ArrayInsertAt() function to a multidimensional array, you must specify all but the last index in the array parameter. The following example inserts an element at myarray24:

Throws

If this function attempts to insert an element at position 0, or specifies a value for position that is greater than the size of array, this function throws an InvalidArrayIndexException error.

Example

<cfscript>
 myCities=["London","New York","Paris","Tokyo","Barcelona"];
 WriteOutput("The input array is: ");
 WriteOutput(serializeJSON(myCities) & "|");
 // Insert the city "Berlin" in myCities after "Paris" at index four
 ArrayInsertAt(myCities,4,"Berlin"); // Returns True
 WriteOutput("Array after inserting Berlin is: ");
 WriteOutput(serializeJSON(myCities)); // returns output array with Berlin as new element
</cfscript>

Output

The input array is: ["London","New York","Paris","Tokyo","Barcelona"]|Array after inserting Berlin is: ["London","New York","Paris","Berlin","Tokyo","Barcelona"]

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