Download Beginning JSON by Ben Smith PDF

By Ben Smith

Beginning JSON is the definitive advisor to JSON - JavaScript item Notation - today’s ordinary in info formatting for the internet. The publication starts off with the fundamentals, and walks you thru all points of utilizing the JSON structure. Beginning JSON covers all parts of JSON from the fundamentals of knowledge codecs to making your individual server to shop and retrieve chronic facts. starting JSON offers you the ability set required for analyzing and writing thoroughly established JSON info.

The first chapters of the ebook will talk about the principles of JavaScript if you want it, and supply the mandatory understandings for later chapters. Chapters three via 12 will discover what info is, easy methods to convert that information right into a transmittable/storable structure, how one can use AJAX to ship and obtain JSON, and, finally, the right way to reassemble that info again right into a right JavaScript item for use through your software. the ultimate chapters placed every thing you discovered into practice.

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Additional info for Beginning JSON

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Syntax diagram illustrating the possible values in JSON String literals in the JavaScript language can possess any number of Unicode characters enclosed within either single or double quotes. However, it will be important to note, as outlined in Figure 4-4, that a JSON string must always begin and end with the use of double quotes. While Crockford does not justify this, it is for interoperable reasons. The C programming grammar states that single quotes identify a single character, such as a or z.

These characters represent the Object and Array quite literally. As was stated in Chapter 2, both an object and an array can be created in one of two distinct fashions. The first invokes the creation of either, through the use of the constructor function defined by the built-in data type we wish to create. This style of object invocation can be seen in Listing 4-3. Listing 4-3. Using the new Keyword to Instantiate an object and array var objectInstantion = new Object(); //invoking the constructor returns a new Object var arrayInstantiation = new Array(); //invoking the constructor returns a new Array The alternative manner, which we can use to create either object or array, is by literally defining the composition of either, as demonstrated in Listing 4-4.

Concatenating Non-Primitive Values with Strings ""+{identifier:"Hello"}; //produces "[object Object]" ""+["Hello",["hello","World"]]; //produces "Hello,hello,World" As revealed in Listing 5-2, while the JavaScript language possesses the ability to create objects out of literal forms, there is no easy way to perform the contrary. In order to deconstruct an object into that of its literal form, the members of an instance must be traversed, analyzed, and assembled piece by piece into its corresponding literal form.

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