10_what_is_type_script

Jul 13, 2026 03:46 · 2:09 · English · Whisper Turbo · 2 Mga Speaker
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No worries,
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we're about to get started soon,
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but I did mention that we're going to use TypeScript in this course.
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We already did use it when we changed the first app.
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What is TypeScript?
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TypeScript really is just a superset to JavaScript.
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It offers more features than vanilla JavaScript,
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like classes,
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interfaces,
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and very important,
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which gives it the name,
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types,
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strong typing.
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So you define in TypeScript if a certain variable is a number,
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a string, or something else.
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You don't do this in vanilla JavaScript.
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There you have dynamic typing.
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You can have a string variable,
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and then you assign a number,
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and that's totally fine.
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That won't work in TypeScript,
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it will give you an error,
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and therefore it allows you to write much more robust code,
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which gets checked at the time you write it,
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and not just at the time you run it.
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A great enhancement.
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However,
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TypeScript doesn't run in the browser,
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so it is compiled to JavaScript in the end.
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And this compilation is handled by the CLI,
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one of the reasons why we need the CLI,
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why we need a project management tool like the CLI.
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Now this compilation is really fast and therefore in the end in the browser JavaScript
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is going to run.
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We're not writing the Angular app in JavaScript though because whilst
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technically possible,
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that won't be much fun.
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A lot of the features really only exist in TypeScript and
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Angular is meant to be used together with TypeScript.
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That being said,
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you don't have to learn TypeScript for this course.
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You should be able to pick it up along the way.
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And I do have a whole section giving you a brief introduction into
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TypeScript at the end of this course.
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So feel free to jump ahead there,
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go through that section right now if you feel like you need that or throughout the course,
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if you feel like you need some deeper dive into some of the features you see
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there and you should be fine.
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You should be able to follow along just fine.
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Of course, if you feel like it,
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feel free to pick up another course or tutorial focused on TypeScript
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so that you have something to look at if something is unclear in this course.
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Generally though,
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TypeScript is an addition to JavaScript,
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not a complete replacement,
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so a lot of the commands will look really familiar.

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