constructors.md

Classes

The Concept

A constructor is a special type of method that is invoked when creating a new class instance.

What to cover

• What is a constructor. What is a constructor? When does it come into play?
• How to define a constructor. What is the syntax to define a parameterless or parameterized constructor?
• How to pass arguments to constructors that have parameters. What is the syntax to pass arguments to parameterized constructors?

Exercises

Remote control car race

This exercise models a race between remote control cars. Each remote control car has a speed and battery (data) that are passed as constructor arguments. Each race also takes a constructor parameter for the race distance. The reference implementation (C#) teaches:

• How to define a constructor.
• The difference between parameterless and parameterized constructor.
• Creating an instance of a class that requires arguments to be passed to its constructor.

Implementations

Track	Exercise	Changes
F#	need-for-speed	None