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Pro TypeScript by Steve Fenton

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CHAPTER 1

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TypeScript Language Features

What if we could strengthen JavaScript with the things that are missing for large scale application development, like static typing, classes [and] modules . . . that’s what TypeScript is about.

—Anders Hejlsberg

TypeScript is a superset of JavaScript. That means that the TypeScript language includes the entire JavaScript language plus a collection of useful additional features. This is in contrast to the various subsets of JavaScript and the various lint tools that seek to reduce the available features to create a smaller language with fewer surprises. This chapter will introduce you to the extra language ...

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