jQuery $ Variable Differences

Question

What is the difference between these two methods of establishing a variable?

JavaSript

var img = $('#redImage');

jQuery

var $img = $('#redImage');

possible duplicate of [The $ dollar sign](http://stackoverflow.com/questions/1180213/the-dollar-sign) — Evan Trimboli, May 07 '13 at 22:21
Your headings are a bit odd. Both those examples are JavaScript and both depend on the jQuery library (or another function named `$` that expects the first argument to be a string containing a CSS selector). — Quentin, May 07 '13 at 22:25

score 8 · Accepted Answer · answered May 07 '13 at 22:18

The have different names (one of them starts with a $ sign, the other does not). That is all. The $ has no special meaning, it is just a character.

Some people use variables starting with a $ as a hint that the variable is expected to have a jQuery object assigned to it. This is much like the Hungarian Notation style of prefixing variable names with letters to indicate the type.

score 2 · Answer 2 · answered May 07 '13 at 22:19

2

$ in var $img is just a naming convention to signify that the variable is a jQuery object

While Doing this -

var img = $('#redImage');
var $img = $('#redImage');

You actually defined two variables with different name - img and $img

answered May 07 '13 at 22:19

Adil Shaikh

44,509
17
89
111

score 1 · Answer 3 · edited May 23 '17 at 11:49

1

One creates a variable named img and the other creates a variable name $img ... The dollar sign is a perfectly valid character in a variable name.

Valid Characters in Javascript Variable Names

edited May 23 '17 at 11:49

Community

1
1

answered May 07 '13 at 22:19

EmeraldD.

150
6

jQuery $ Variable Differences

3 Answers3