JavaScript Tutorials - Herong's Tutorial Examples

∟Data Types, Variables and Expressions

This chapter provides a quick introduction of JavaScript fundamental concepts: data types, variables, and expressions. Topics include primitive data types; variable declaration; operation expression evaluation.

Primitive Data Types - Numbers, Strings, and Booleans

Numeric Value Literals

String Literals

Declaring Variables - "var" Statements

Operators and Expressions

Operators and Expressions - Examples

Takeaways:

• JavaScript supports 5 primitive data types: Numbers, Strings, Booleans, Null, and Undefined.
• Values of Number data type can be provided in 3 literal formats: Integer, Floating-Point, and Hexadecimal Digit.
• Values of String data type can be provided in quoted string literals, with escape sequences to support non-printable and Unicode characters.
• Variables should be declared in "var" statements first.
• JavaScripts basic operators divided into several groups: Arithmetic, Comparison, Logical, Bitwise, Assignment, etc.

Table of Contents

 About This Book

 Introduction to JavaScript

 ECMAScript Language Specification and JavaScript Dialects

►Data Types, Variables and Expressions

 Flow Control Statements

 Creating, Accessing, and Manipulating Arrays

 Defining and Calling Functions

 Web Browser Supporting JavaScript

 Server-Side and Client-Side Web Scripting

 Introduction to Objects

 Defining Your Own Object Types

 Inheritance of Properties and Methods through the Prototype Object Chain

 'jrunscript' - JavaScript Shell Command from JDK

 Using Functions as "Function" Objects

 Introduction to Built-in Object Types

 W3C's Document Object Model (DOM) Specifications

 AJAX (Asynchronous JavaScript And XML)

 References

 Full Version in PDF/EPUB

Data Types, Variables and Expressions - Updated in 2023, by Herong Yang