Secondly, not everything must be typed explicitly - TypeScript is very smart and can deduce types for us. Firstly, if we would not comply with declared types, TypeScript would alarm us that something is wrong and prevent misuse. There are additional things about this example that you should know. Finally, we create a new variable with information on whether justine is an adult. After this, we create justine, our example data that can be used for calling the previously defined function. Later we utilize this newly created type to create function isAdult that accepts one argument of type User and returns boolean. The first part (with the type keyword) is responsible for declaring our custom object type representing users. Take a look at this code snippet and then we can unpack it together: We can talk about other TypeScript benefits later, let's see some examples now! Examples It makes our code more secure and robust by preventing many bugs before the code is even shipped - it catches problems during code development and integrates wonderfully with code editors like Visual Studio Code. TypeScript is a really powerful tool and opens a new world of possibilities in JavaScript projects. Thanks to types, it's possible, for example, to declare what kind of arguments we are expecting and what is returned exactly in our functions or what's the exact shape of the object that we are creating.
The most notable addition is static type definitions, something that is not present in plain JavaScript.
It's loved and used by a lot of software developers around the world.īasically, it's a superset of JavaScript that adds new capabilities to the language. TypeScript is a trendy open-source language maintained and developed by Microsoft.
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