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ArrayInsertAt
Last update:
May 18, 2026
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.
Category
Function syntax
ArrayInsertAt(array, position, value)
See also
ArrayDeleteAt ; Functions for XML object management in Modifying a ColdFusion XML object in the Developing ColdFusion Applications
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:
<cfset ArrayInsertAt(myarray[2], 4, "test")>
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"]
Example- Insert a value in an empty array
<cfscript>
a = [] // empty array
arrayInsertAt(a, 1, "Value");
writeDump(a);
</cfscript>The value is inserted into position one in the array.
Example 2- Non-empty array
<cfscript>
a = []; // empty array
a[1] = "Value1"; // add first element
arrayInsertAt(a, 2, "Value2"); // add second element
writeDump(a)
</cfscript>
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