Installing Node.JS

You will need to install the TypeScript engine for you to use TypeScript. This is because your TypeScript code must be converted into JavaScript, so it needs a program called a transpiler to do the conversion to JavaScript so that a browser can run it. What does a Transpiler Actually Do? A transpiler is not…

JavaScript, as the language has gotten more complex, has realized that it needs to have the ability to easily import and export code from other modules, while not degrading the performance of a webpage. This is because, by default, a webpage downloads a script and processes it once downloaded, all while blocking all other downloads…

Once we’ve created our first TypeScript file, we need to convert it to JavaScript if we want our browsers (or Node.JS) to run it. There are several online sandbox tools to let you write code, but they won’t convert it to JavaScript, at least none that I’ve found yet. To set it up, you will…

The tsconfig.json file specifies the root files and the compiler options required to compile a TypeScript project. So presence of a tsconfig.json file in a directory indicates that the directory is the root of a TypeScript project. Without that file, the compiler will continue to move up the directory hierarchy to fine the config file. There is also a…

We’ve already talked about interfaces in TypeScript, some with our discussion on Custom Data Types. However, we can go further with what they can do. So we previously had an interface that looked something like: However, we might not want, or even need, all of those properties. Therefore, we can make some of them optional,…

It is common to write a function where the return data type is related to the data type(s) of the parameters passed to the functions. Let’s look at an example of this: This function will return the first element of an array. However, it uses the any data type to allow for any type of…