Behavioral Design Patterns

__________ is a behavioral design pattern that lets an object alter its behavior when its internal state changes. It appears as if the object changed its class.

• State

• Command

• Mediator

• Observer

What concept is the State pattern closely related to?

• Finite Machine

• State Machine

• Finite-Stable Machine

• Finite-State Machine

The main idea of the State Pattern is that, at any given moment, there’s a ________ number of states which a program can be in.

• infinit

• finit

• finalized

• finished

What kind of operators are mostly implemented in the State machine?

• conditional

• loop

• assignment

• all of the mentioned

What pattern can we use when having an object that behaves differently depending on its current state, the number of states is enormous, and the state-specific code changes frequently?

• Command

• Mediator

• State

• Observer

Use this pattern when you have a class polluted with massive conditionals that alter how the class behaves according to the current values of the class’s fields. What pattern?

• Observer

• Mediator

• State

• Strategy

What pattern you can use when having a lot of duplicate code across similar states and transitions of a condition-based state machine.

• Observer

• Mediator

• State

• Command

Implementation of State Pattern organizes the code related to particular states into separate classes and introduces new states without changing existing state classes or the context. Which of SOLID principles would follow you?

• Single Responsibility

• Open/Closed

• Interface Segregation

• Dependency Inversion

__________ is a behavioral design pattern that lets you define a family of algorithms and put each of them into a separate class, and make their objects interchangeable.

• Strategy

• State

• Observer

• Memento

Use the ______________ pattern when you want to use different variants of an algorithm within an object and be able to switch from one algorithm to another during runtime.

• State

• Mediator

• Strategy

• Template Method