StructCopy

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

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Description

Copies a structure. Copies top-level keys, values, and arrays in the structure by value; copies nested structures by reference.

Returns

A copy of a structure, with the same keys and values; if structure does not exist, throws an exception.

Syntax

StructCopy(structure)

StructCopy(structure)

Parameters

Parameter	Description
structure	Structure to copy

Usage

The following code shows how this function copies a structure that contains a string field, a number field, and a two-dimensional array at the top-level:

</cfoutput>

<cfset assignedCopy = StructNew()>
<cfset assignedCopy.string = #struct.string#>
<cfset assignedCopy.number = #struct.number#>
<cfset assignedCopy.array = ArrayNew(2)>
<cfset assignedCopy.array[1][1] = #struct.array[1][1]#>
<cfset assignedCopy.array[1][2] = #sruct.array[1][2]#>
</cfoutput>

The following code shows how StructCopy copies a nested structure:

</cfoutput>

<cfset assignedCopy.nestedStruct = struct.nestedStruct>
</cfoutput>

To copy a structure entirely by value, use Duplicate.The following table shows how variables are assigned:

Variable type	Assigned by
structure.any_simple_valueBooleanBinaryBase64	Value
structure.array	Value
structure.nested_structure	Reference
structure.object	Reference
structure.query	Reference

Example 1

// This script creates a structure that StructCopy copies by value.

// Create elements.

s = StructNew();

s.array = ArrayNew(2);

// Assign simple values to original top-level structure fields.

s.number = 99;

s.string = "hello tommy";

// Assign values to original top-level array.

s.array[1][1] = "one one";

s.array[1][2] = "one two";

</cfscript>

<hr>

Original Values

// Simple values

s.number = #s.number#

s.string = #s.string#

// Array value

s.array[1][1] = #s.array[1][1]#

s.array[1][2] = #s.array[1][2]#

</cfoutput>

// Copy this structure to a new structure.

// Change the values of the original structure.

s.number = 100;

s.string = "hello tommy (modified)";

s.array[1][1] = "one one (modified)";

s.array[1][2] = "one two (modified)";

</cfscript>

<hr>

Modified Original Values

// Simple values

s.number = #s.number#

s.string = #s.string#

// Array value

s.array[1][1] = #s.array[1][1]#

s.array[1][2] = #s.array[1][2]#

</cfoutput>

<hr>

Copied structure values should be the same as the original.

// Simple values

copied.number = #copied.number#

copied.string = #copied.string#

// Array value

copied.array[1][1] = #copied.array[1][1]#

copied.array[1][2] = #copied.array[1][2]#

</cfoutput>

// This script creates a structure that StructCopy copies by reference.

// Create elements.

s = StructNew();

s.nested = StructNew();

s.nested.array = ArrayNew(2);

// Assign simple values to nested structure fields.

s.nested.number = 99;

s.nested.string = "hello tommy";

// Assign values to nested array.

s.nested.array[1][1] = "one one";

s.nested.array[1][2] = "one two";

</cfscript>

<hr>

Original Values

// Simple values

s.nested.number = #s.nested.number#

s.nested.string = #s.nested.string#

// Array values

s.nested.array[1][1] = #s.nested.array[1][1]#

s.nested.array[1][2] = #s.nested.array[1][2]#

</cfoutput>

// Use StructCopy to copy this structure to a new structure.

// Use Duplicate to clone this structure to a new structure.

// Change the values of the original structure.

s.nested.number = 100;

s.nested.string = "hello tommy (modified)";

s.nested.array[1][1] = "one one (modified)";

s.nested.array[1][2] = "one two (modified)";

</cfscript>

<hr>

Modified Original Values

// Simple values

s.nested.number = #s.nested.number#

s.nested.string = #s.nested.string#

// Array value

s.nested.array[1][1] = #s.nested.array[1][1]#

s.nested.array[1][2] = #s.nested.array[1][2]#

</cfoutput>

<hr>

Copied structure values should reflect changes to original.

// Simple values

copied.nested.number = #copied.nested.number#

copied.nested.string = #copied.nested.string#

// Array values

copied.nested.array[1][1] = #copied.nested.array[1][1]#

copied.nested.array[1][2] = #copied.nested.array[1][2]#

</cfoutput>

<hr>

Duplicated structure values should remain unchanged.

// Simple values

duplicated.nested.number = #duplicated.nested.number#

duplicated.nested.string = #duplicated.nested.string#

// Array value

duplicated.nested.array[1][1] = #duplicated.nested.array[1][1]#

duplicated.nested.array[1][2] = #duplicated.nested.array[1][2]#

</cfoutput>

// This script creates a structure that StructCopy copies by value. <cfscript> // Create elements. s = StructNew(); s.array = ArrayNew(2); // Assign simple values to original top-level structure fields. s.number = 99; s.string = "hello tommy"; // Assign values to original top-level array. s.array[1][1] = "one one"; s.array[1][2] = "one two"; </cfscript>  <hr> Original Values <cfoutput> // Simple values s.number = #s.number# s.string = #s.string# // Array value s.array[1][1] = #s.array[1][1]# s.array[1][2] = #s.array[1][2]# </cfoutput> // Copy this structure to a new structure. <cfset copied = StructCopy(s)> <cfscript> // Change the values of the original structure. s.number = 100; s.string = "hello tommy (modified)"; s.array[1][1] = "one one (modified)"; s.array[1][2] = "one two (modified)"; </cfscript> <hr> Modified Original Values <cfoutput> // Simple values s.number = #s.number# s.string = #s.string# // Array value s.array[1][1] = #s.array[1][1]# s.array[1][2] = #s.array[1][2]# </cfoutput> <hr> Copied structure values should be the same as the original. <cfoutput> // Simple values copied.number = #copied.number# copied.string = #copied.string# // Array value copied.array[1][1] = #copied.array[1][1]# copied.array[1][2] = #copied.array[1][2]# </cfoutput> // This script creates a structure that StructCopy copies by reference. <cfscript> // Create elements. s = StructNew(); s.nested = StructNew(); s.nested.array = ArrayNew(2); // Assign simple values to nested structure fields. s.nested.number = 99; s.nested.string = "hello tommy"; // Assign values to nested array. s.nested.array[1][1] = "one one"; s.nested.array[1][2] = "one two"; </cfscript>  <hr> Original Values <cfoutput> // Simple values s.nested.number = #s.nested.number# s.nested.string = #s.nested.string# // Array values s.nested.array[1][1] = #s.nested.array[1][1]# s.nested.array[1][2] = #s.nested.array[1][2]# </cfoutput> // Use StructCopy to copy this structure to a new structure. <cfset copied = StructCopy(s)> // Use Duplicate to clone this structure to a new structure. <cfset duplicated = Duplicate(s)> <cfscript> // Change the values of the original structure. s.nested.number = 100; s.nested.string = "hello tommy (modified)"; s.nested.array[1][1] = "one one (modified)"; s.nested.array[1][2] = "one two (modified)"; </cfscript> <hr> Modified Original Values <cfoutput> // Simple values s.nested.number = #s.nested.number# s.nested.string = #s.nested.string# // Array value s.nested.array[1][1] = #s.nested.array[1][1]# s.nested.array[1][2] = #s.nested.array[1][2]# </cfoutput> <hr> Copied structure values should reflect changes to original. <cfoutput> // Simple values copied.nested.number = #copied.nested.number# copied.nested.string = #copied.nested.string# // Array values copied.nested.array[1][1] = #copied.nested.array[1][1]# copied.nested.array[1][2] = #copied.nested.array[1][2]# </cfoutput> <hr> Duplicated structure values should remain unchanged. <cfoutput> // Simple values duplicated.nested.number = #duplicated.nested.number# duplicated.nested.string = #duplicated.nested.string# // Array value duplicated.nested.array[1][1] = #duplicated.nested.array[1][1]# duplicated.nested.array[1][2] = #duplicated.nested.array[1][2]# </cfoutput>

<!--- This code shows assignment by-value and by-reference. ---> 
// This script creates a structure that StructCopy copies by value. <br> 
<cfscript> 
// Create elements. 
s = StructNew(); 
s.array = ArrayNew(2); 

// Assign simple values to original top-level structure fields. 
s.number = 99; 
s.string = "hello tommy"; 

// Assign values to original top-level array. 
s.array[1][1] = "one one"; 
s.array[1][2] = "one two"; 
</cfscript> 

<!--- Output original structure ---> 
<hr> 
<b>Original Values</b><br> 
<cfoutput> 
// Simple values <br> 
s.number = #s.number#<br> 
s.string = #s.string#<br> 
// Array value <br> 
s.array[1][1] = #s.array[1][1]#<br> 
s.array[1][2] = #s.array[1][2]#<br> 
</cfoutput> 

// Copy this structure to a new structure. <br> 
<cfset copied = StructCopy(s)> 

<cfscript> 
// Change the values of the original structure. <br> 
s.number = 100; 
s.string = "hello tommy (modified)"; 
s.array[1][1] = "one one (modified)"; 
s.array[1][2] = "one two (modified)"; 
</cfscript> 
<hr> 
<b>Modified Original Values</b><br> 
<cfoutput> 
// Simple values <br> 
s.number = #s.number#<br> 
s.string = #s.string#<br> 
// Array value <br> 
s.array[1][1] = #s.array[1][1]#<br> 
s.array[1][2] = #s.array[1][2]#<br> 
</cfoutput> 
<hr> 
<b>Copied structure values should be the same as the original.</b><br> 
<cfoutput> 
// Simple values <br> 
copied.number = #copied.number#<br> 
copied.string = #copied.string#<br> 
// Array value <br> 
copied.array[1][1] = #copied.array[1][1]#<br> 
copied.array[1][2] = #copied.array[1][2]#<br> 
</cfoutput> 

// This script creates a structure that StructCopy copies by reference. 
<cfscript> 
// Create elements. 
s = StructNew(); 
s.nested = StructNew(); 
s.nested.array = ArrayNew(2); 
// Assign simple values to nested structure fields. 
s.nested.number = 99; 
s.nested.string = "hello tommy"; 
// Assign values to nested array. 
s.nested.array[1][1] = "one one"; 
s.nested.array[1][2] = "one two"; 
</cfscript> 

<!--- Output original structure ---> 
<hr> 
<b>Original Values</b><br> 
<cfoutput> 
// Simple values <br> 
s.nested.number = #s.nested.number#<br> 
s.nested.string = #s.nested.string#<br> 

// Array values <br> 
s.nested.array[1][1] = #s.nested.array[1][1]#<br> 
s.nested.array[1][2] = #s.nested.array[1][2]#<br> 
</cfoutput> 

// Use StructCopy to copy this structure to a new structure. <br> 
<cfset copied = StructCopy(s)> 
// Use Duplicate to clone this structure to a new structure. <br> 
<cfset duplicated = Duplicate(s)> 

<cfscript> 
// Change the values of the original structure. 
s.nested.number = 100; 
s.nested.string = "hello tommy (modified)"; 
s.nested.array[1][1] = "one one (modified)"; 
s.nested.array[1][2] = "one two (modified)"; 
</cfscript> 
<hr> 
<b>Modified Original Values</b><br> 
<cfoutput> 
// Simple values <br> 
s.nested.number = #s.nested.number#<br> 
s.nested.string = #s.nested.string#<br> 

// Array value <br> 
s.nested.array[1][1] = #s.nested.array[1][1]#<br> 
s.nested.array[1][2] = #s.nested.array[1][2]#<br> 
</cfoutput> 

<hr> 
<b>Copied structure values should reflect changes to original.</b><br> 
<cfoutput> 
// Simple values <br> 
copied.nested.number = #copied.nested.number#<br> 
copied.nested.string = #copied.nested.string#<br> 
// Array values <br> 
copied.nested.array[1][1] = #copied.nested.array[1][1]#<br> 
copied.nested.array[1][2] = #copied.nested.array[1][2]#<br> 
</cfoutput> 

<hr> 
<b>Duplicated structure values should remain unchanged.</b><br> 
<cfoutput> 
// Simple values <br> 
duplicated.nested.number = #duplicated.nested.number#<br> 
duplicated.nested.string = #duplicated.nested.string#<br> 
// Array value <br> 
duplicated.nested.array[1][1] = #duplicated.nested.array[1][1]#<br> 
duplicated.nested.array[1][2] = #duplicated.nested.array[1][2]#<br> 
</cfoutput>

Example 2

myStruct=StructNew();// Create struct myStruct

myStruct={a=2,b=4,c=8,d=10,e=12,f=12};// Define keys in myStruct

myStruct.mySecondStruct=StructNew(); //Create nested struct mySecondStruct

myStruct.mySecondStruct.a1=50;//Define keys in mySecondStruct

myStruct.mySecondStruct.a2=12;

myStruct.mySecondStruct.myThirdStruct=StructNew();// Create another nested struct myThirdStruct

myStruct.mySecondStruct.myThirdStruct.b1=12;//Define keys in myThirdStruct

myStruct.mySecondStruct.myThirdStruct.b2=65;

copyStruct=StructCopy(myStruct)

writeDump(copyStruct)

</cfscript>

<cfscript> myStruct=StructNew();// Create struct myStruct myStruct={a=2,b=4,c=8,d=10,e=12,f=12};// Define keys in myStruct myStruct.mySecondStruct=StructNew(); //Create nested struct mySecondStruct myStruct.mySecondStruct.a1=50;//Define keys in mySecondStruct myStruct.mySecondStruct.a2=12; myStruct.mySecondStruct.myThirdStruct=StructNew();// Create another nested struct myThirdStruct myStruct.mySecondStruct.myThirdStruct.b1=12;//Define keys in myThirdStruct myStruct.mySecondStruct.myThirdStruct.b2=65; copyStruct=StructCopy(myStruct) writeDump(copyStruct) </cfscript>

<cfscript>
       myStruct=StructNew();// Create struct myStruct
       myStruct={a=2,b=4,c=8,d=10,e=12,f=12};// Define keys in myStruct
       myStruct.mySecondStruct=StructNew(); //Create nested struct mySecondStruct
       myStruct.mySecondStruct.a1=50;//Define keys in mySecondStruct
       myStruct.mySecondStruct.a2=12;
       myStruct.mySecondStruct.myThirdStruct=StructNew();// Create another nested struct myThirdStruct
       myStruct.mySecondStruct.myThirdStruct.b1=12;//Define keys in myThirdStruct
       myStruct.mySecondStruct.myThirdStruct.b2=65;
       copyStruct=StructCopy(myStruct)
       writeDump(copyStruct)
</cfscript>

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StructCopy

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Example 1

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