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|descr= Add two [[Number]]s, concatenate two [[Array]]s or two [[String]]s, or create a copy of an Array or [[HashMap]].
|descr= Add two [[Number]]s, concatenate two [[Array]]s or two [[String]]s, or create a copy of an Array or [[HashMap]].


{{Feature | Warning | [[Array]] copy methods {{hl|ARRAY + []}} and {{hl|+ ARRAY}} have different behaviours:
{{Feature|warning|[[Array]] copy methods {{hl|ARRAY + []}} and {{hl|+ ARRAY}} have different behaviours:
* {{hl|ARRAY + []}} creates copy of the 1st dimension, but preserves references in other dimensions ({{Wikipedia|Object copying#Shallow copy|shallow copy}}).
* {{hl|ARRAY + []}} creates copy of the 1st dimension, but preserves references in other dimensions ({{Link|https://en.wikipedia.org/wiki/Object_copying#Shallow_copy|shallow copy}}).
* {{hl|+ ARRAY}} clones every element, so if the array is multi-dimensional, the created copy contains no references ({{Wikipedia|Object copying#Deep copy|deep copy}}).
* {{hl|+ ARRAY}} clones every element, so if the array is multi-dimensional, the created copy contains no references ({{Link|https://en.wikipedia.org/wiki/Object_copying#Deep_copy|deep copy}}).
See [[#Example_6|Example 6]].}}
See [[#Example_6|Example 6]].
}}


|s1= numberA [[+]] numberB
|s1= numberA [[+]] numberB
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|p2= numberB: [[Number]]
|p2= numberB: [[Number]]


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


|s2= [[+]] number
|s2= [[+]] number
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|p21= number: [[Number]]
|p21= number: [[Number]]


|r2= [[Number]] - The value of the parameter ''number''
|r2= [[Number]] - the value of the parameter ''number''


|s3= arrayA [[+]] arrayB
|s3= arrayA [[+]] arrayB
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|p42= arrayB: [[Array]]
|p42= arrayB: [[Array]]


|r3= [[Array]] - A new array filled with ''arrayA'' and ''arrayB'' elements, in that order
|r3= [[Array]] - a new array filled with ''arrayA'' and ''arrayB'' elements, in that order


|s4= stringA [[+]] stringB
|s4= stringA [[+]] stringB
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|p81= array: [[Array]]
|p81= array: [[Array]]


|r5= [[Array]] - A new instance of the provided array filled with same elements ({{Wikipedia|Object copying#Deep copy|deep copy}})
|r5= [[Array]] - a new instance of the provided array filled with same elements ({{Link|https://en.wikipedia.org/wiki/Object_copying#Deep_copy|deep copy}})


|s6= [[+]] hashMap
|s6= [[+]] hashMap
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|p101= hashMap: [[HashMap]]
|p101= hashMap: [[HashMap]]


|r6= [[HashMap]] - A new instance of the provided [[HashMap]] filled with the same key-value pairs ({{Wikipedia|Object copying#Deep copy|deep copy}})
|r6= [[HashMap]] - a new instance of the provided [[HashMap]] filled with the same key-value pairs ({{Link|https://en.wikipedia.org/wiki/Object_copying#Deep_copy|deep copy}})


|x1= <sqf>
|x1= <sqf notrim>
 5 +  3 // returns  8
5 +  3 // returns  8
-5 + -3 // returns -8
-5 + -3 // returns -8
</sqf>
</sqf>

Latest revision as of 15:51, 8 November 2023

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Description

Description:
Add two Numbers, concatenate two Arrays or two Strings, or create a copy of an Array or HashMap.
⚠
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:
MathArraysHashMapStrings

Syntax 1

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

Syntax 2

Syntax:
+ number
Parameters:
number: Number
Return Value:
Number - the value of the parameter number

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:
+ array
Parameters:
array: Array
Return Value:
Array - a new instance of the provided array filled with same elements (deep copy)

Syntax 6

Syntax:
+ hashMap
Parameters:
hashMap: HashMap
Return Value:
HashMap - a new instance of the provided HashMap filled with the same key-value pairs (deep copy)

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]; // _arrayA = [1,2,3], _arrayB = [99,2,3]
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:
Operators pushBack append merge

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
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