Typescript overview
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Introduction to typescript - a scripting language that is a superset of javascript and provides many features that aren't available in javascript.
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Why TypeScript?
Why TypeScript?FITC Presented at Web Unleashed on September 16-17, 2015 in Toronto, Canada
More info at www.fitc.ca/webu
Why TypeScript?
with Jeff Francis
OVERVIEW
TypeScript is a type-checked superset of JavaScript that benefits medium-sized to complex JavaScript projects. Why would you want to learn a new language, instead of another JavaScript framework? You have all this existing JavaScript code, so how can you adopt something new without throwing the old stuff out?
This session is about the benefits of using TypeScript on top of JavaScript in your projects, and demonstrate step by step ways of migrating an existing JavaScript project to TypeScript. We will dive into code generated by the compiler and look at resources and tools that make working in TypeScript a pleasurable experience.
OBJECTIVE
To understand when it’s a good idea to use TypeScript.
TARGET AUDIENCE
JavaScript developers.
ASSUMED AUDIENCE KNOWLEDGE
Intermediate JavaScript experience.
FIVE THINGS AUDIENCE MEMBERS WILL LEARN
The basics of TypeScript – types, classes, modules, and functions
How TypeScript’s design makes getting started simple and helps projects
What compiled TypeScript looks like and how to debug
What tools can help take advantage of TypeScript’s type information
How to migrate a JavaScript project to TypeScript
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TypeScript
* This presentation is to show TypeScript's major feature and the benefit that it brings to your JavaScript projects.
* Our main objective is just to spark interest especially to those not familiar with the tool.
Slide 2
- What is TypeScript
* go to next slide
Slide 3
- Is a superset of JavaScript
* it simply means an extension to JavaScript
- Use JavaScript code on TypeScript
* JS code naturally works on TypeScript
* Which also means your beloved JavaScript libraries such as JQuery, or your fancy interacive plugins would work as well.
- TypeScript compiles to plain old JavaScript
* TS code compiles to simple and clean JS.
Slide 4
- Screenshot of TS compiled to JS
* In this example, compiling a TS class code would result to a JS version, and a regular JavaScript function when compiled is basically untouched.
Slide 5
- TypeScript's Main Feature
* So what does TS provide us with? What does it actually do?
Slide 6
- Static Type Checking
* TypeScript allows us to enable type checking by defining data types to your for ex. variables, function parameters and return types.
Slide 7
- Screenshot of basic Static Type Checking
* In this example…
* What I've done here was to assign supposedly wrong values for what the variables or parameters were meant to hold
* As JavaScript is a dynamic and untyped language these expressions would either fail or be okay when you run it on your browser.
* In TypeScript by enabling static type checking these potential errors are caught earlier (see the red marks on the expressions) and wouldn't even allow you to compile unless these are resolved.
* In addition you can also type arrays and object literals
Slide 8
- Effects of Static Type Checking
* As TS code is statically type-checked a side effect of such...
- Allows IDEs to perform live error checks
- Exposes auto-completion and code hinting
Slide 9
- Screenshot of code hinting
* Say I was coding JQuery on regular JavaScript code there would be no natural way to help me identify its class properties, methods and parameters... except through reading the API documentation or a separate plugin.
* As a result of static type checking this allows IDE's to access these class members as code hints
* So if this was a 3rd party library how much more if you are just referencing your own JavaScript/TypeScript files within your project.
Slide 10
- A few of the other cool features
* That was only the basic feature of TypeScript
* A few of the other cool features are...
Slide 11
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* So what does TS provide us with? What does it actually do?
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Typescript overview
- 1. Typescript: an overview - By P. Thanvi lahari
- 2. AGENDA • Introduction • Why TypeScript? • Featured • TypeScript VS JavaScript • Who uses TypeScript? • Conclusion
- 3. INTRODUCTION TypeScript is a scripting language developed and maintained by Microsoft. It is a strict syntactical superset of JavaScript. TypeScript is designed for the development of large applications and trans compiles to JavaScript.
- 4. WHY TYPE SCRIPT? TypeScript simplifies JavaScript code, making it easier to read and debug. Provide an optional type system for JavaScript. It has more modular development. It has more planned features than JavaScript versions. TypeScript makes code easier to read and understand.
- 5. FEATURES Data Type supported Classes Interface Modules Arrow Expressions Ambient declarations and many more..!!
- 6. TYPE SCRIPT VS JAVA SCRIPT Typescript is a superset of JavaScript. Typescript code needs to be compiled. Typescript uses concepts like types and interfaces to describe data being used. Typescript is a powerful type system, including generics & JS features for large size project. JavaScript is a scripting language which helps you create interactive web pages. JavaScript code doesn’t need to compile. JavaScript has no such concept. JavaScript is an ideal option for small size project.
- 8. CONCLUSION It is safer and more modular. It has high value, low-cost improvement over java script. To use TS, we need to know to some quirks of JS. Current compiler of TS is little slow, the faster is under development.
- 9. THANK YOU