Why does Raphael use object[apply]?

I've been looking through the Raphael s开发者_开发百科ource – source

They appear to use

object[apply](obj, args)

which I am assuming is equivalent to

object.apply(obj, args)

Am I assuming correctly? And if so why do they do this?

Thanks

Edit

As @deceze says apply is a variable and therefore it is not equivalent. However, on line 38 they assign the string "apply" to the variable apply so this makes it equivalent. Why would you do this?

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Using the dot notation is really just syntactic sugar for for object[propertyname], but it has one disadvantage, the property name cannot be minified.

By doing

var apply = "apply";
foobar[apply](.....
foobar[apply](.....
foobar[apply](.....
foobar[apply](.....

this can actually be minified to

var a = "apply";
b[a](.....
b[a](.....
b[a](.....
b[a](.....

And there's your reason, Raphael uses the [] notation in order to provide better minification.

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In that case apply should be a variable which holds the name of a method, so this is a way of calling object methods with variable names. As such it is not equivalent to object.apply(), since this always calls the apply() method.

var apply = 'foo';
object[apply](); // calls object.foo()