October 2002
Intermediate to advanced
136 pages
2h 44m
English
Content preview from JavaScript Pocket Reference, 2nd EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 1. The JavaScript Language
JavaScript is a lightweight, object-based scripting language that can be embedded in HTML pages. This book starts with coverage of the core JavaScript language, followed by material on client-side JavaScript, as used in web browsers. The final portion of this book is a quick-reference for the core and client-side JavaScript APIs.
Syntax
JavaScript syntax is modeled on Java syntax, Java syntax, in turn, is modeled on C and C++ syntax. Therefore, C, C++, and Java programmers should find that JavaScript syntax is comfortably familiar.
Case sensitivity
JavaScript is a case-sensitive language. All keywords are in lowercase. All variables, function names, and other identifiers must be typed with a consistent capitalization.
Whitespace
JavaScript ignores whitespace between tokens. You may use spaces, tabs, and newlines to format and indent your code in a readable fashion.
Semicolons
JavaScript statements are terminated by semicolons. When a statement is followed by a newline, however, the terminating semicolon may be omitted. Note that this places a restriction on where you may legally break lines in your JavaScript programs: you may not break a statement across two lines if the first line can be a complete legal statement on its own.
Comments
JavaScript supports both C and C++ comments. Any amount of text,
on one or more lines, between /*
and */ is a comment, and is ignored
by JavaScript. Also, any text between // and the end of the current line is a comment, ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.