TypeScript - Constructors

Instead of referencing the class name itself (like in c#), constructors must use the constructor keyword.

class Spaceship
{
    // Properties
    NumberOfEngines: number;
    ShipName: string;

    // constructor
    constructor(engines: number, shipName: string)
    {
    this.NumberOfEngines = engines;
    this.ShipName = shipName;
    }
}

There is another way for defining a constructor which takes incoming arguments and sets properties on the class. See the example below.

// Example 1
class Spaceship
{
    // Properties
    NumberOfEngines: number;
    ShipName: string;

    // constructor
    constructor(engines: number, shipName: string)
    {
        this.NumberOfEngines = engines;
        this.ShipName = shipName;
    }
}

// Example 2
class Spaceship
{

    // This technique takes the arguments and automatically creates the arguments into properties
    // of the class.  Notice the access modifiers too.  These are public but you can also use private, readonly, and
    // protected.  These are known as PARAMETER PROPERTIES.

    // constructor
    constructor(public NumberOfEngines: number, public ShipName: string)
    {
    }
}