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A complete information to Typescript for JavaScript builders


In case you are a JavaScript developer, you should have heard about Typescript at one level or one other. If in case you have been reluctant about giving Typescript a strive as a result of you aren’t certain the way it might serve you higher than JavaScript, you could have come to the correct place.

This information provides an introductory however complete information to Typescript any JavaScript developer would want to get began with it.

What’s Typescript, what’s its sort system, and the way wouldn’t it profit you as a JavaScript developer to make use of Typescript in your subsequent undertaking? You can see solutions to all these questions by the top of this text.

Observe: I could also be a bit biased in the direction of Typescript. There’s no undertaking that I begin the place I desire JS to Typescript.

What’s Typescript?

You may consider Typescript as a language that gives an extra layer over JavaScript.

Why?

Though we initially write our code in Typescript, we are able to’t instantly run Typescript on a browser like we run JavaScript. As a substitute, Typescript goes by means of an extra compilation step to transform its code into browser-recognized JavaScript.

So, even after we program in Typescript, the end-program that runs on the browser will likely be in JavaScript.

Then, why can we use Typescript in any respect?

Although Typescript doesn’t present extra functionalities than JavaScript at runtime, it affords a set of options to make sure that we, the builders, can write much less error-prone and higher maintainable code in comparison with when utilizing simply JavaScript.

How does Typescript try this?

Typescript, because the title suggests, introduces a sort system on high of vanilla JavaScript. Whereas with JavaScript, the kind of variable is dynamically assigned, Typescript forces us to pre-define the kind of the variable we’re declaring.

With JavaScript, we are able to assign an integer worth to a variable within the first line and assign a string worth to it within the subsequent.

However with Typescript, we are able to prohibit this habits by explicitly declaring a sort for a variable. If we attempt to assign a string to a variable of sort “quantity,” it generates an error.