$. function signature in jquery

Question

In jquery, what does the following notation mean

$.function

Is it to show a function is globally available?

Answer 1

$ is an alias to the jQuery object, so $.function is the same as calling jQuery.function.

Edit: It also applies to the jQuery method.

Answer 2

No, in jQuery, the jQuery object, is aliased as $ as well, so instead of writing:

jQuery.doSomething();

you can write

$.doSomething();

Answer 3

This function behaves just like $(document).ready(), in that it should be used to wrap other $() operations on your page that depend on the DOM being ready. While this function is, technically, chainable, there really isn't much use for chaining against it.

$ is basically a way to call the jQuery class.