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So now that we know for whom this module is,

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let me summarize javascript briefly.

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Javascript is a weakly typed programming language, 

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it's an object oriented programming language

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and it's very versatile

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and what do you mean with that? Weakly type

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means that we have no explicit type assignment,

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javascript knows types like numbers or text which is called string or booleans which is true or false

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but it doesn't force you to define which type you're using in a variable or in a function

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and indeed, you can also have a variable where you store a number which you then suddenly change to a

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text variable,

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so you can switch types dynamically. In other languages this is differently

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and whilst this gives you greater flexibility to be able to change it and to not have strict typing,

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it also can lead to errors,

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so it is just something you have to be aware of.

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Object oriented simply means that data can be organized in logical objects and we'll see these objects

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in this module.

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And one important concept here is that you have to be aware about the difference of primitive and reference

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types and attached to this lecture,

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you'll find a link to an article and video I created for my free YouTube channel, Academind where I

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do dive into primitive and reference types and where I do explain the difference and why they are important,

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so definitely check that out if primitive and reference types don't tell you anything. Regarding the

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versatility,

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well we can see that in this course.

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Javascript runs in the browser and this is actually where it comes from but you can also use it with

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nodejs to run it on your PC

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outside of a browser set up or also on a server

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therefore and that is exactly what we'll do in this course.

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We'll build a web server with nodejs,

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so we got this broad versatility of being able to use javascript on different platforms. And you can

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also perform a broad variety of tasks with javascript also depending on the platform you're running

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on.

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You can in the browser listen to user events, re-render the DOM and on the server or on a PC, you

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can work with files, with databases,

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lot of cool stuff.

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So this is a summary of javascript and what makes up the language,

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let's now dive into some core features, also some core next generation javascript features which are supported

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by nodejs

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and let's see some things we'll see throughout the course.