When you do that, you are telling TypeScript that those constructor parameters are also properties of that class. In this snippet, you removed the name and age property declarations from the class body and moved them to be inside the parameters list of the constructor. You can create a class declaration by using the class keyword, followed by the class name and then a Because of this, this tutorial will focus on some of the distinguishing features available in TypeScript. While you will cover some of the fundamental aspects of creating classes with TypeScript, the syntax is mostly the same used to create classes with JavaScript. In this section, you will run through examples of the syntax used to create classes in TypeScript. You can also try out these benefits in the TypeScript Playground.Īll examples shown in this tutorial were created using TypeScript version 4.3.2. To gain the benefit of these, you can use a text editor like Visual Studio Code, which has full support for TypeScript out of the box.
This is not necessary to use TypeScript but does take more advantage of TypeScript features. This tutorial will reference aspects of text editors that support TypeScript and show in-line errors.If you need more information on these topics, reading our How To Code in JavaScript series is recommended. You will need sufficient knowledge of JavaScript, especially ES6+ syntax, such as destructuring, rest operators, and imports/exports.If you do not wish to create a TypeScript environment on your local machine, you can use the official TypeScript Playground to follow along.To do this, refer to the official TypeScript website. Additionally, you will need the TypeScript Compiler ( tsc) installed on your machine.This also works if you are using the Windows Subsystem for Linux (WSL). To install on macOS or Ubuntu 18.04, follow the steps in How to Install Node.js and Create a Local Development Environment on macOS or the Installing Using a PPA section of How To Install Node.js on Ubuntu 18.04. This tutorial was tested with Node.js version 14.3.0 and npm version 6.14.5. Both Node and npm (or yarn) installed in order to run a development environment that handles TypeScript-related packages.To set this up on your local machine, you will need the following: An environment in which you can execute TypeScript programs to follow along with the examples.It will lead you through examples with different code samples, which you can follow along with in your own TypeScript environment. This tutorial will go through the syntax used to create classes, the different features available, and how classes are treated in TypeScript during the compile-time type-check. TypeScript has full support for that syntax and also adds features on top of it, like member visibility, abstract classes, generic classes, arrow function methods, and a few others. In 2015, ECMAScript 6 introduced a new syntax to JavaScript to create classes that internally uses the prototype features of the language. These objects may contain an initial state and implement behaviors bound to that particular object instance. IntroductionĬlasses are a common abstraction used in object-oriented programming (OOP) languages to describe data structures known as objects. The following code segments explain how this can be achieved.The author selected the COVID-19 Relief Fund to receive a donation as part of the Write for DOnations program. Class, Object, Constructor, từ khóa new, từ khóa this, Getter, Setter
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