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m (Text replacement - "\{\{ *codecomment *\| *\/\/ *([^ ]+) *\}\} " to "{{cc|$1}}")
m (revert + fix)
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{{RV|type=command
{{RV|type=command


| ofp
|displayTitle= +


|1.00
|sortKey= #


|arg=
|game1= ofp


|eff=
|version1= 1.00
 
|serverExec= 


|gr1= Math  
|gr1= Math  


| Add two numbers, concatenate two arrays or two strings, or duplicate an array. For arrays also see [[pushBack]] and [[append]].  
|descr= Add two numbers, concatenate two arrays or two strings, or duplicate an array. For arrays also see [[pushBack]] and [[append]].  


{{Warning | [[Array]] copy methods <tt>ARRAY + []</tt> and <tt>+ARRAY</tt> have different behaviours:
{{Warning | [[Array]] copy methods <tt>ARRAY + []</tt> and <tt>+ARRAY</tt> have different behaviours:
* <tt>ARRAY + []</tt> creates copy of the 1st dimension, but preserves references in other dimensions ({{Wikipedia|Object copying#Shallow copy|shallow copy}}).
* <tt>ARRAY + []</tt> creates copy of the 1st dimension, but preserves references in other dimensions ({{Wikipedia|Object copying#Shallow copy|shallow copy}}).
* <tt>+ARRAY</tt> clones every element, so if the array is multi-dimensional, the created copy contains no references ({{Wikipedia|Object copying#Deep copy|deep copy}}).
* <tt>+ARRAY</tt> clones every element, so if the array is multi-dimensional, the created copy contains no references ({{Wikipedia|Object copying#Deep copy|deep copy}}).
See [[#Examples|Example 6]].}}  
See [[#Example_6|Example 6]].}}


| numberA [[+]] numberB  
|s1= numberA [[+]] numberB


|p1= numberA: [[Number]]  
|p1= numberA: [[Number]]


|p2= numberB: [[Number]]  
|p2= numberB: [[Number]]


| [[Number]] - the sum of ''numberA'' and ''numberB''  
|r1= [[Number]] - the sum of ''numberA'' and ''numberB''


|s2= [[+]] numberA  
|s2= [[+]] numberA


|p21= numberA: [[Number]]  
|p21= numberA: [[Number]]


|r2= [[Number]] - returns ''numberA''
|r2= [[Number]] - returns ''numberA''
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|s3= arrayA [[+]] arrayB
|s3= arrayA [[+]] arrayB


|p41= arrayA: [[Array]] |Alternative 3 Parameter 1=
|p41= arrayA: [[Array]]


|p42= arrayB: [[Array]] |Alternative 3 Parameter 2=
|p42= arrayB: [[Array]]


|r3= [[Array]] - a new array filled with ''arrayA'' and ''arrayB'' elements, in that order. |Alternative 3 Return Value=
|r3= [[Array]] - a new array filled with ''arrayA'' and ''arrayB'' elements, in that order


|s4= stringA [[+]] stringB
|s4= stringA [[+]] stringB


|p61= stringA: [[String]] |Alternative 4 Parameter 1=
|p61= stringA: [[String]]


|p62= stringB: [[String]] |Alternative 4 Parameter 2=
|p62= stringB: [[String]]


|r4= [[String]] - a string concatenating ''stringA'' and ''stringB'' |Alternative 4 Return Value=
|r4= [[String]] - a string concatenating ''stringA'' and ''stringB''


|s5= [[+]] arrayA
|s5= [[+]] arrayA


|p81= arrayA: [[Array]] |Alternative 5 Parameter 1=
|p81= arrayA: [[Array]]


|r5= [[Array]] - a new instance of array filled with same items. |Alternative 5 Return Value=
|r5= [[Array]] - a new instance of array filled with same items.


|x1= <code> 5 [[+]]  3; {{cc| returns 8}}-5 [[+]] -3; {{codecomment|// returns -8}}</code>  
|x1= <code> 5 [[+]]  3; {{cc| returns 8}}-5 [[+]] -3; {{cc|returns -8}}</code>  


|x2= <code>[[+]]  2; {{cc| returns  2}}[[+]] -7; {{codecomment|// returns -7}}</code>  
|x2= <code>[[+]]  2; {{cc| returns  2}}[[+]] -7; {{cc|returns -7}}</code>  


|x3= <code>_arrayA = [1,2,3];
|x3= <code>_arrayA = [1,2,3];
_arrayB = [3,4,5];
_arrayB = [3,4,5];
_arrayAB = _arrayA + _arrayB; {{codecomment|// _arrayAB {{=}} [1,2,3,3,4,5]
_arrayAB = _arrayA + _arrayB; {{cc|_arrayAB {{=}} [1,2,3,3,4,5]}}
// _arrayA and _arrayB remain unchanged}}</code>  
{{cc|_arrayA and _arrayB remain unchanged}}</code>  


|x4= <code>_result = "Hello" + " " + "there"; {{codecomment|// "Hello there"}}</code>  
|x4= <code>_result = "Hello" + " " + "there"; {{cc|"Hello there"}}</code>  


|x5= <code>_arrayA = [1,2,3];
|x5= <code>_arrayA = [1,2,3];
_arrayB = +_arrayA;
_arrayB = +_arrayA;
_arrayB [[set]] [0, 99]; {{codecomment|// _arrayA {{=}} [1,2,3], _arrayB {{=}} [99,2,3]}}</code>  
_arrayB [[set]] [0, 99]; {{cc|_arrayA = [1,2,3], _arrayB {{=}} [99,2,3]}}</code>  


|x6= Shallow copy with <tt>ARRAY + []</tt>:
|x6= Shallow copy with <tt>ARRAY + []</tt>:
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_array2 [[select]] 0 [[set]] [0, "oops"];
_array2 [[select]] 0 [[set]] [0, "oops"];
[[hint]] [[str]] _subArray; {{cc|["oops", 2, 3]}}</code>
[[hint]] [[str]] _subArray; {{cc|["oops", 2, 3]}}</code>
Deep copy with <tt>+ARRAY</tt>:
Deep copy with <tt>+ARRAY</tt>:
<code>[[private]] _subArray {{=}} [1, 2, 3];
<code>[[private]] _subArray {{=}} [1, 2, 3];
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[[hint]] [[str]] _subArray; {{cc|[1, 2, 3]}}</code>  
[[hint]] [[str]] _subArray; {{cc|[1, 2, 3]}}</code>  


| [[Operators]], [[pushBack]], [[append]]  
|seealso= [[Operators]], [[pushBack]], [[append]]  
}}
}}


[[Category:Scripting Commands|#]]
[[Category:Scripting Commands OFP 1.99|#]]
[[Category:Scripting Commands OFP 1.99|#]]
[[Category:Scripting Commands OFP 1.96|#]]
[[Category:Scripting Commands OFP 1.96|#]]

Revision as of 20:57, 29 January 2021

Logo A0.png1.00
Hover & click on the images for description

Description

Description:
Add two numbers, concatenate two arrays or two strings, or duplicate an array. For arrays also see pushBack and append.
⚠
Array copy methods ARRAY + [] and +ARRAY have different behaviours:
  • ARRAY + [] creates copy of the 1st dimension, but preserves references in other dimensions (shallow copy).
  • +ARRAY clones every element, so if the array is multi-dimensional, the created copy contains no references (deep copy).
See Example 6.
Groups:
Math

Syntax 1

Syntax:
numberA + numberB
Parameters:
numberA: Number
numberB: Number
Return Value:
Number - the sum of numberA and numberB

Syntax 2

Syntax:
+ numberA
Parameters:
numberA: Number
Return Value:
Number - returns numberA

Syntax 3

Syntax:
arrayA + arrayB
Parameters:
arrayA: Array
arrayB: Array
Return Value:
Array - a new array filled with arrayA and arrayB elements, in that order

Syntax 4

Syntax:
stringA + stringB
Parameters:
stringA: String
stringB: String
Return Value:
String - a string concatenating stringA and stringB

Syntax 5

Syntax:
+ arrayA
Parameters:
arrayA: Array
Return Value:
Array - a new instance of array filled with same items.

Examples

Example 1:
5 + 3; // returns 8-5 + -3; // returns -8
Example 2:
+ 2; // returns 2+ -7; // returns -7
Example 3:
_arrayA = [1,2,3]; _arrayB = [3,4,5]; _arrayAB = _arrayA + _arrayB; // _arrayAB = [1,2,3,3,4,5] // _arrayA and _arrayB remain unchanged
Example 4:
_result = "Hello" + " " + "there"; // "Hello there"
Example 5:
_arrayA = [1,2,3]; _arrayB = +_arrayA; _arrayB set [0, 99]; // -no comment defined-
Example 6:
Shallow copy with ARRAY + []: private _subArray = [1, 2, 3]; private _array1 = [_subArray, 1, 2, 3]; private _array2 = _array1 + []; _array2 select 0 set [0, "oops"]; hint str _subArray; // ["oops", 2, 3] Deep copy with +ARRAY: private _subArray = [1, 2, 3]; private _array1 = [_subArray, 1, 2, 3]; private _array2 = +_array1; _array2 select 0 set [0, "oops"]; hint str _subArray; // [1, 2, 3]

Additional Information

See also:
OperatorspushBackappend

Notes

Report bugs on the Feedback Tracker and/or discuss them on the Arma Discord or on the Forums.
Only post proven facts here! Add Note
Retrieved from "https://community.bistudio.com/wiki?title=%2B&oldid=225009"