google closure compiler and json

Question

I have a json string that I parse and then access the properties of the object with the dot notation. However, in the google closure compiler, the dot notation (MyObject.P

Answer 1

EDIT: the @expose directive has been deprecated

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Google Closure Compiler lets you specify directives on how compilation should be done through annotations.

See: https://developers.google.com/closure/compiler/docs/js-for-compiler

Properly using @expose and @type you can preserve the name of a property in your code.

It is possible to safely decode a JSON string into an object and access that object using the dot notation. You'll be also able to stringify back the data.

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Let's make an example:

You want to parse an array of objects. Every object represents a "size", with the properties w for width and h for height.

Declare a prototype for the size object and expose its properties w and h

function size() {}

/** @expose */
size.prototype.w = 0;
/** @expose */
size.prototype.h = 0;

Then you want to put the JSON parsed data into an array called data.

Using @type you declare that data is going to hold an array of object of type size.

function main()
{
    /** @type {Array.} */
    var data;

    // string built up just for example purposes
    var response = '[{"w": 10, "h": 20}]';

    // parse the array
    var data = JSON.parse(response);

    // access data with dot notation!
    console.log(data[0].w+ "    "+ data[0].h);
}

main();