Home Web Front-end JS Tutorial What are the data types in TypeScript? (code example)

What are the data types in TypeScript? (code example)

Mar 26, 2019 am 11:18 AM

Whenever a variable is created, the intention is to assign some value to the variable, but what type of value can be assigned to the variable depends on the data type of the variable. In typeScript, type System represents the different types of data types supported by typeScript. Data types are classified as follows:

What are the data types in TypeScript? (code example)

Built-in data types: TypeScript has some predefined data types-

Built-in data type Keyword Description
Number Number It is used to represent integers and floating point numbers
Boolean Boolean Represents true and false
String String It is used to represent a sequence of characters
Void Void Usually used for function return types
Null Null Use it when the object does not have any value
Undefined Undefined Indicates the value of an uninitialized variable
Any Any If you declare a variable using the Any data type, you can assign any type of value to the variable

Example:

1

2

3

4

5

6

7

8

9

10

let a: null = null;

let b: number = 123;

 

let c: number = 123.456;

let d: string = ‘Geeks’;

let e: undefined = undefined;

let f: boolean = true;

let g: number = 0b111001; // 二进制

let h: number = 0o436; // 八进制

let i: number = 0xadf0d; // Hexa-Decimal

Copy after login

User-defined data types: In addition to built-in data types, users can also customize data types. User-defined types include enums, classes, interfaces, arrays, and tuples.

Note: Among the built-in data types, any is a special data type and the super data type of all data types. If we declare a variable with any data type, then we can assign any type value to the variable.

Example:

1

2

3

4

5

6

let a: any = null;

let b: any =123;

let c: any = 123.456;

let d: any = ‘Geeks’;

let e: any = undefined;

let f: any = true;

Copy after login

Related recommendations: "typescript document tutorial"

This article is about the introduction of data types in TypeScript. I hope it will help you if you need Friends help!

The above is the detailed content of What are the data types in TypeScript? (code example). For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
2 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Repo: How To Revive Teammates
1 months ago By 尊渡假赌尊渡假赌尊渡假赌
Hello Kitty Island Adventure: How To Get Giant Seeds
4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Replace String Characters in JavaScript Replace String Characters in JavaScript Mar 11, 2025 am 12:07 AM

Detailed explanation of JavaScript string replacement method and FAQ This article will explore two ways to replace string characters in JavaScript: internal JavaScript code and internal HTML for web pages. Replace string inside JavaScript code The most direct way is to use the replace() method: str = str.replace("find","replace"); This method replaces only the first match. To replace all matches, use a regular expression and add the global flag g: str = str.replace(/fi

Custom Google Search API Setup Tutorial Custom Google Search API Setup Tutorial Mar 04, 2025 am 01:06 AM

This tutorial shows you how to integrate a custom Google Search API into your blog or website, offering a more refined search experience than standard WordPress theme search functions. It's surprisingly easy! You'll be able to restrict searches to y

Build Your Own AJAX Web Applications Build Your Own AJAX Web Applications Mar 09, 2025 am 12:11 AM

So here you are, ready to learn all about this thing called AJAX. But, what exactly is it? The term AJAX refers to a loose grouping of technologies that are used to create dynamic, interactive web content. The term AJAX, originally coined by Jesse J

Example Colors JSON File Example Colors JSON File Mar 03, 2025 am 12:35 AM

This article series was rewritten in mid 2017 with up-to-date information and fresh examples. In this JSON example, we will look at how we can store simple values in a file using JSON format. Using the key-value pair notation, we can store any kind

8 Stunning jQuery Page Layout Plugins 8 Stunning jQuery Page Layout Plugins Mar 06, 2025 am 12:48 AM

Leverage jQuery for Effortless Web Page Layouts: 8 Essential Plugins jQuery simplifies web page layout significantly. This article highlights eight powerful jQuery plugins that streamline the process, particularly useful for manual website creation

What is 'this' in JavaScript? What is 'this' in JavaScript? Mar 04, 2025 am 01:15 AM

Core points This in JavaScript usually refers to an object that "owns" the method, but it depends on how the function is called. When there is no current object, this refers to the global object. In a web browser, it is represented by window. When calling a function, this maintains the global object; but when calling an object constructor or any of its methods, this refers to an instance of the object. You can change the context of this using methods such as call(), apply(), and bind(). These methods call the function using the given this value and parameters. JavaScript is an excellent programming language. A few years ago, this sentence was

Improve Your jQuery Knowledge with the Source Viewer Improve Your jQuery Knowledge with the Source Viewer Mar 05, 2025 am 12:54 AM

jQuery is a great JavaScript framework. However, as with any library, sometimes it’s necessary to get under the hood to discover what’s going on. Perhaps it’s because you’re tracing a bug or are just curious about how jQuery achieves a particular UI

10 Mobile Cheat Sheets for Mobile Development 10 Mobile Cheat Sheets for Mobile Development Mar 05, 2025 am 12:43 AM

This post compiles helpful cheat sheets, reference guides, quick recipes, and code snippets for Android, Blackberry, and iPhone app development. No developer should be without them! Touch Gesture Reference Guide (PDF) A valuable resource for desig

See all articles