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The code in question is here:
var $item = $(this).parent().parent().find('input'); What is the purpose of the dollar sign in the variable name, why not just exclude it?
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Updated on July 03, 2019. The dollar sign ($) and the underscore (_) characters are JavaScript identifiers, which just means that they identify an object in the same way a name would. The objects they identify include things such as variables, functions, properties, events, and objects.
When used in a regular expression, the dollar sign is used to represent the end of the line or string. For example, in the following Perl code, if the user's input stored in the $input variable ends with the "example," it would print "I see example." to the screen.
The $() function The dollar function, $(), can be used as shorthand for the getElementById function. To refer to an element in the Document Object Model (DOM) of an HTML page, the usual function identifying an element is: document.
In jQuery, the $ sign is just an alias to jQuery() , then an alias for a function. This page reports: Basic syntax is: $(selector).action() A dollar sign to define jQuery.
A '$' in a variable means nothing special to the interpreter, much like an underscore.
From what I've seen, many people using jQuery (which is what your example code looks like to me) tend to prefix variables that contain a jQuery object with a $ so that they are easily identified and not mixed up with, say, integers.
The dollar sign function $() in jQuery is a library function that is frequently used, so a short name is desirable.
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In your example the $ has no special significance other than being a character of the name.
However, in ECMAScript 6 (ES6) the $ may represent a Template Literal
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