JavaScript jQuery Variables i should avoid using that conflicts with Global variables

Question

What are JavaScript/jQuery variable names i should avoid creating that could conflict with already existing Global variables. Yesterday i discovered that i cannot use the variable default . It must be a global variable.

Answer 1

default is not a global variable: it is a reserved word (it's used in switch statements).

You can find a list of reserved keywords on the MDC website .

Note also that there are various other names that you should be careful with. For instance, a variable named location could conflict with the window.location object unless you're careful. For this reason (among others), you should avoid global variables.

Other such variables are:

• window.top
• window.parent
• window.document
• window.self
• and quite a few more.

Answer 2

default is one of the JavaScript reserved words (which is also the list of variables to avoid using). jQuery wise it is $ although you can use jQuery in no conflict mode .

Answer 3

default is a JavaScript keyword:

switch(foo)
{
    case a:
        break;
    default:
        break;
}

As for jQuery reserved words, check out this link (scroll down to the "Reserved Words" section)

Answer 4

These are JavaScript's reserved words:

• abstract
• boolean, break, byte
• case, catch, char, class, const, continue
• debugger, default, delete, do, double
• else, enum, export, extends
• false, final, finally, float, for, function
• goto
• if, implements, import, in, instanceof, int, interface
• long
• native, new, null
• package, private, protected, public
• return
• short, static, super, switch, synchronized
• this, throw, throws, transient, true, try, typeof
• var, volatile, void
• while, with

You should avoid naming you variables the same as that list.

I hope this helps.
Hristo

Answer 5

default is not a global variable, it's a reserved word in JavaScript.

If you are going to use global variables, you should namespace them .

Answer 6

Take a look at:

http://jqfundamentals.com/book/index.html

There's a special content of reserved words.

Answer 7

when building jQuery plugins, be aware that $.fn.init = function() could lead to problems and you should rather use another name for your function. http://www.sarahleeashraf.com/explaining-jquery-part-2-init-function