What Do Curly Braces Represent in JavaScript Expressions?

What Lies Within Curly Braces in JavaScript Expressions?

While you might encounter code snippets like this in jQuery files:

xxx.css({ 'float' : 'right' });

one may wonder what the curly braces enclose.

Object In Disguise

In the presented example, the curly braces encapsulate an object that is passed to the css function. An object can be defined simply using curly braces:

myObj = {} // Initializes an empty object

Alternatively, you can directly assign properties and methods within the object declaration:

myObj = {'float' : 'right'}
xxx.css(myObj);

Expanding on Objects

Objects possess properties and methods:

var myObj = {
    'varOne': 'One',
    'methodOne': function() { alert('methodOne has been called!')},
}

myObj.methodOne(); // Displays 'methodOne has been called!'

In essence, curly braces in expression position serve as a mechanism to define objects that enhance the functionality of JavaScript code. A demonstration of this behavior can be found in the provided fiddle.

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