Dealing with nested if then else/nested switch statements

Question

Are there any design patterns/methods/ways to remove nested if then else conditions/switch statements?

I remember coming across some methods used by the Google folks

Answer 1

You might want to look at the Strategy Pattern, wherein instead of putting a long chain of ifs with linked conditions, you abstract each condition to a different object, each one defining what its specific behavior.

The class that defines those objects will implement an Interface which will be called by the parent object.