Equality and relational operators

The following table lists the meanings of equality and relational operators.

To test whether two objects x and y represent the same thing, use the== operator. (In the rare case where you need to know whether twoobjects are the exact same object, use the identical()function instead.) Here’s how the == operator works:

• If x or y is null, return true if both are null, and false if onlyone is null.
• Return the result of the method invocationx.==(y). (That’s right,operators such as == are methods that are invoked on their firstoperand. You can even override many operators, including ==, asyou’ll see inOverridable operators.)

Here’s an example of using each of the equality and relationaloperators:

1. assert(2 == 2);
2. assert(2 != 3);
3. assert(3 > 2);
4. assert(2 < 3);
5. assert(3 >= 3);
6. assert(2 <= 3);