If you're considering taking up web application development as a career, or even as a serious hobby, the question will arise, what language should you invest your time and efforts in. Your goal is to maximize the value of your applications and to improve your marketability.
JavaScript has long been a favorite in the world of developers, and there is plenty of room in the market for new talent to create and maintain JavaScript applications. But more recently, TypeScript has grown in popularity, even transforming seasoned JavaScript programmers into TypeScript aficionados.
TypeScript vs JavaScript: What Is TypeScript?

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Most developers are quite familiar with JavaScript and its many advantages over alternative languages for developing web applications:
But even with the many advantages and tools offered by JavaScript, TypeScript entered the development picture with new technology that takes your coding activity to the next level.
TypeScript contains all the functionality that made JavaScript so popular and useful for web development. As a "superset" of JavaScript, your JavaScript code will run unmodified in TypeScript. TypeScript programs actually compile into JavaScript code.
Where Did TypeScript Come from and Why?

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Microsoft introduced TypeScr in 2012, intending to give developers an improved programming language that includes advanced features and options: ipt
From a background standpoint, it's worth noting that Microsoft?s underlying purpose for creating TypeScript was to speed up development by their own internal teams who were struggling to build JavaScript applications for internal projects.
Interestingly, TypeScript itself is actually written in TypeScript.
Why Use JavaScript and TypeScript (or Both)?
There are many reasons to select JavaScript as a development language, as borne out by the millions of software developers worldwide. Stack Overflow estimates there are 20 million application developers on Earth, with the most popular language by far being JavaScript. But with the advent of TypeScript, even the most experienced JavaScript programmers are taking to this technology due to the advantages of TypeScript vs. JavaScript.
JavaScript Advantages
JavaScript has offered software engineers many features and options for years, proliferating its use for many reasons:
TypeScript Advantages
TypeScript has now come along offering many additional features:
TypeScript vs JavaScript: When and How to Use Each of Them

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Essentially, since TypeScript produces JavaScript, it seems logical that you should take advantage of the additional features of TypeScript to speed code generation and increase your development productivity.
That may not always be the case.
When to Use TypeScript
There are plenty of good reasons and situations that warrant developing with TypeScript:
When Not to Use TypeScript
Since TypeScript creates JavaScript code, you may think (as many developers do) that there is no reason to avoid it ? using TypeScript would be a "can't lose" situation. But that's not necessarily the case.
There are reasons and scenarios that could make the use of TypeScript less than optimal:
TypeScript vs JavaScript? Making the Choice
Choosing between TypeScript and JavaScript depends on several factors:
If the answer to those questions is a resounding yes. TypeScript is your best solution.

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On the other hand:
If yes is your answer to those questions, it may be more beneficial to stick with JavaScript.
To be sure, many businesses and third-party software developers have embraced TypeScript for application development, and the community is growing. More tools are hitting the market that enhance the TypeScript language as a complete framework for building applications.
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