Scala Equality in 30 seconds

1. In scala == delegages to equals method.

 a == b is equivalent to a equals b
2. If you want to check referrential equality you call eq method. 

 a eq b is true only if a and b are referrences to the same object

3. Case classes and Value Classes (2.10) get the equals and hashcode based on class parameters for free.

End of the story!