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Revision as of 00:17, 7 February 2021

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Description:: Add two numbers, concatenate two arrays or two strings, or duplicate an array. For arrays also see pushBack and append. -unknown feature ("$Warning ") defined-
Groups:: Math Arrays Strings

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

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]

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@@ Line 15: / Line 15: @@
 |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:
+{{Feature |$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> clones every element, so if the array is multi-dimensional, the created copy contains no references ({{Wikipedia|Object copying#Deep copy|deep copy}}).