How Do Curly Braces Define Object Literals in JavaScript?

Object Literal Syntax in JavaScript

In JavaScript, curly braces ({}) are used to define object literals. Object literals are used to create objects that contain key-value pairs.

Consider this jQuery code:

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

The curly braces in this context define an object literal that is passed as an argument to the css() function. The object literal contains a single property, 'float', which is assigned the value 'right'.

This is equivalent to creating an object explicitly using the {} syntax:

var myObj = {}; // An empty object

myObj['float'] = 'right';
xxx.css(myObj);

Object literals can also contain methods, as shown in this example:

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

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

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