TypeScript Classes

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TypeScript also treats classes as their own type:

class Foo { foo: number; }

class Bar { bar: string; }

class Baz {

constructor(foo: Foo, bar: Bar) { }

}

let baz = new Baz(new Foo(), new Bar()); // valid

baz = new Baz(new Bar(), new Foo());     // tsc errors

Like function parameters, classes sometimes have optional members. The same ?: syntax can be used on a class definition:

class Person {

name: string;

nickName?: string;

}

In the above example, an instance of Person is guaranteed to have a name, and might optionally have a nickName

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