Question

The below code is perfectly valid in JavaScript :-

( { a:10 , b:20 , c:30 } );

But when do we need such an Object which we can’t reference in our code ?

Answer 1

You often use an unnamed literal as a parameter to a function call. A popular example is calling jQuery plugin methods on elements, eg:

$("div").someMethod({prop:'value',otherProp:'value2'});

It is also possible (and often beneficial) to assign such objects to variables beforehand and then passing it in, like so:

var options = {prop:'value',otherProp:'value2'};
$("div").someMethod(options);

But sometimes its just easier and cleaner the first way.