Class constructor

- [Instructor] We've already taken a look…at how to use classes in the more traditional way,…more like C#, where we created properties and fields…and then passed in parameters to the constructor…and assigned the parameters to the properties and fields.…TypeScript offers a different and more efficient way…to do this as well.…Let's create a file called classes2.ts,…and this time, we're going to create a new class,…let's call it Person2, and in Person2,…we're not going to declare any properties or fields.…

We're going to declare a constructor, as we did last time,…however, the parameters to that constructor…are going to be declared…with the keywords public and private.…We'll start by saying public firstName: string.…Now, this does two things.…It says that I have a parameter firstName,…which works exactly as any other parameter.…But it also declares an implicit property named firstName,…and I can do that again with lastName,…which will be a string.…

We'll make a third implicit property email,…which will be a string,…