jQuery $ Variable Differences

Question

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

JavaSript

var img = $('#redImage');

jQuery

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

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
– Quentin, Commented May 7, 2013 at 22:25

Quentin · Accepted Answer · 2013-05-07 22:18:47Z

8

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.

answered May 7, 2013 at 22:18

Quentin

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Comments

Adil Shaikh · Accepted Answer · 2013-05-07 22:19:58Z

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 7, 2013 at 22:19

Adil Shaikh

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Comments

Community · Accepted Answer · 2017-05-23 11:49:16Z

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, 2017 at 11:49

CommunityBot

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answered May 7, 2013 at 22:19

EmeraldD.

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