The next part is the assignment operator =, which assigns a value to the
constant s1. The value here is a string enclosed in quotes, "Hello World".
If you use a playground to prototype the code here, you will see that it
immediately reports the value of the s1 constant on the right side of the screen.
You can reference a constant by using its name. To get the value of s1, you
can just type in the constant name anywhere in your code. Try it right now
by typing s1 into your playground (see Listing 2-2).