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Type script

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Type script Introduction

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Type script

  1. 1. TypeScript
  2. 2.  TypeScript is about addressing this problem  A problem that we hear increasingly more and more from customers and internal users that writing really large apps in JavaScript is hard.  And JavaScript was really never intended for writing large apps  JavaScript has no concept for structuring large code bases. No classes, not yet at least, no modules, no interfaces, and there's no static typing at all.  It's a purely dynamically typed language.
  3. 3.  The intelligent IDEs that we as programmers rely on every day , at the core of most of it is static typing, or the ability to reason about the code in intelligent ways  so the IDE can deliver invaluable things like statement completion, go to definition, find all references, refactorings that are known to be safe.  That just gets a super, super hard in big dynamic code bases.
  4. 4.  And that really, in a nutshell, is whatTypeScript is.  It's a language for large scale JavaScript app development.
  5. 5.  In a more technical sense, it is a statically typed super set of JavaScript that compiles to plain JavaScript.  SoTypeScript itself is written inTypeScript and therefore compiles to plain JavaScript.
  6. 6.  Basically, it starts with JavaScript.  So it's important to understand thatTypeScript is not a new language or different language.  It is at the core of it JavaScript.  But it's JavaScript with type annotations and the ability to declare types.
  7. 7.  So what it adds is types, including generics and all sorts of other fun stuff.
  8. 8.  And then, powered by that is excellent tooling, tooling that does things that you just couldn't do with purely a dynamic programming language.
  9. 9.  But when you compile, it all goes away, and you're just left with JavaScript.  In fact, you're left with what I would argue is idiomatic JavaScript that looks like a human wrote it.  The code that you get is the code that you wrote, minus the types.
  10. 10. reference  https://www.youtube.com/watch?v=Ut694dsIa8w  https://www.youtube.com/watch?v=K68NVae-PBs

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