Use of identical operator(===) in Swift

Question

I am very new to swift programming. I got stuck by the === operator in Swift. What is the basic use of identical operator (===) in Swift.

Answer 1

=== is the identity operator, which tests if two variables refer to the same instance. The equality operator == only tests if two objects are equal.

You can test the following code in a Playground:

let str1 = NSURL(string: "http://www.google.com")
let str2 = str1
let str3 = NSURL(string: "http://www.google.com")

str1 == str2  // true
str1 == str3  // true
str1 === str2 // true
str1 === str3 // false