JavaScript Tutorial
JavaScript Syntax (With Examples)
Table of Contents
- Introduction
- What is Syntax in JavaScript?
- JavaScript Variables
- JavaScript Data Types
- JavaScript Operators
- JavaScript Control Structures
- JavaScript Functions
- JavaScript Objects
- JavaScript Arrays
- JavaScript Error Handling
- JavaScript Promises and Async/Await
- JavaScript DOM Manipulation
- JavaScript Modules
FAQs About JavaScript Syntax
JavaScript syntax is the set of rules and conventions that define how JavaScript programs are written and interpreted by the browser.
Semicolons are used to terminate statements in JavaScript. While optional in many cases, they ensure proper interpretation of the code, especially when multiple statements are on the same line.
JavaScript is case-sensitive, meaning variable and Variable would be treated as two distinct identifiers. Proper casing is critical in variable names, function names, and object properties.
Variable names must begin with a letter, underscore _, or dollar sign $. They cannot start with numbers and must not contain spaces or special characters.
Single-line comments use // and are placed on a single line.
Multi-line comments use /* */ and can span multiple lines.
Curly braces define code blocks, such as in functions, loops, and conditional statements. They group statements together, ensuring correct execution flow.
Parentheses are used in function calls, to group expressions, and to pass arguments in functions. They play a key role in controlling the execution order.
== checks for equality after type conversion.
=== checks for strict equality without performing type conversion.
Literals are fixed values in the code, such as numbers (42), strings ("Hello"), or boolean values (true, false). They represent constant data.
Yes, JavaScript syntax is standardized by ECMAScript and is supported across modern browsers, ensuring cross-browser compatibility.
