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Object-Oriented JavaScript - Second Edition

You're reading from   Object-Oriented JavaScript - Second Edition If you've limited or no experience with JavaScript, this book will put you on the road to being an expert. A wonderfully compiled introduction to objects in JavaScript, it teaches through examples and practical play.

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Product type Paperback
Published in Jul 2013
Publisher Packt
ISBN-13 9781849693127
Length 382 pages
Edition 2nd Edition
Languages
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Toc

Table of Contents (14) Chapters Close

Preface 1. Object-oriented JavaScript 2. Primitive Data Types, Arrays, Loops, and Conditions FREE CHAPTER 3. Functions 4. Objects 5. Prototype 6. Inheritance 7. The Browser Environment 8. Coding and Design Patterns A. Reserved Words B. Built-in Functions
C. Built-in Objects D. Regular Expressions
Index

JSON

The JSON object is new to ES5. It's not a constructor (similarly to Math) and has only two methods: parse() and stringify(). For ES3 browsers that don't support JSON natively, you can use the "shim" from http://json.org.

JSON stands for JavaScript Object Notation. It's a lightweight data interchange format. It's a subset of JavaScript that only supports primitives, object literals, and array literals.

Members of the JSON object

Method

Description

parse(text, callback)

Takes a JSON-encoded string and returns an object:

> var data = '{"hello": 1, "hi": [1, 2, 3]}';
> var o = JSON.parse(data);
> o.hello;
1
> o.hi;
[1, 2, 3]

The optional callback lets you provide your own function that can inspect and modify the result. The callback takes key and value arguments and can modify the value or delete it (by returning undefined).

> function callback(key, value) {
    console.log(key, value);
    if (key ===...
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