Concatination of strings in Swift

Question

I would like to get final String like below:

var urlString = "http://testurl.com/contacts=["1111111","2222222"]"

There are three strings http://testurl.com/contacts= , 1111111 and 2222222

How to concatenate these strings in Swift

Answer 1

var str1 =  "http://testurl.com/contacts="
var str2 = "1111111"
var str3 = "2222222"
var finalString = "\(str1)[\"\(str2)\",\"\(str3)\"]"