Addition operator for swift array usage: array1 + = Array2

var stringList1 = [string] ()                                      //Create String type empty array var stringList2 = ["1", "3", "5", "7", "Zoo", "9", "Zoo"]var stringList3: [ String] = ["2", "4", "6", "Apple", "8", "ten"]stringlist1 + = StringList2                                        //Add all elements of the STRINGLIST2 array to the end of the StringList1 print ("StringList1: \ (stringList1)")                              Output Stringlist1stringlist1 + = StringList3                                     //Add all elements of the STRINGLIST3 array to the end of the StringList1 print ("StringList1: \ ( STRINGLIST1)                              //Output StringList1

Operation Result:

StringList1: ["1", "3", "5", "7", "Zoo", "9", "Zoo"]stringlist1: ["1", "3", "5", "7", "Zoo", "9", "Zoo", "2", "4", "6", "a Pple "," 8 "," 10 "]

The elements of the output above are unordered and can be sorted using the array's sort () method or the sortInPlace () method, unlike

The sort () method has a return value that returns a new array without changing the value of the original array :

Print ("After sort: \ (Stringlist1.sort ())") Print ("StringList1: \ (stringList1)")

Operation Result:

After sort: ["1", "Ten", "2", "3", "4", "5", "6", "7", "8", "9", "Apple", "Zoo", "Zoo"]stringlist1: ["1", "3", "5", "7", "Z Oo "," 9 "," Zoo "," 2 "," 4 "," 6 "," Apple "," 8 "," 10 "]

The sortInPlace () method has no return value and changes the value of the original array :

Stringlist1.sortinplace () Print ("StringList1: \ (stringList1)")

Operation Result:

StringList1: ["1", "Ten", "2", "3", "4", "5", "6", "7", "8", "9", "Apple", "Zoo", "Zoo"]

The + = operator can only be used between arrays and cannot add a single element:

var str = "MyString" StringList1 + = str         //Line error: Binary operator ' + = ' cannot be applied to operands of type ' [String] ' an d ' String '

Addition operator for swift array usage: array1 + = Array2