Why does JQuery have dollar signs everywhere?

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I am working on a project with quite a lot of JQuery in it. The JQuery has a lot of $ signs everywhere, for example

$(document).ready(function () {
        $('input[type=file]').wl_File({
            url: '/Admin/PolicyInventory/UploadDocuments',
            onFileError: function (error, fileobj) {
                $.msg('file is not allowed: ' + fileobj.name, {
                    header: error.msg + ' Error ',
                    live: 10000
                });
            }
        });
...

My question is, what does this dollar sign mean? Why is it used all over the place and how do I understand and interpret it? It reminds me of the scary days of when I was learning Scheme at University and had to put brackets everywhere without knowing why I was doing it.

$ is just a shortcut for jQuery. The idea is that everything is done with the one global symbol (since the global namespaces is ridiculously crowded), jQuery, but you can use $ (because it's shorter) if you like:

// These are the same barring your using noConflict (more below)
var divs = $("div");       // Find all divs
var divs = jQuery("div");  // Also find all divs, because
console.log($ === jQuery); // "true"

If you don't want to use the alias, you don't have to. And if you want $ to not be an alias for jQuery, you can use noConflict and the library will restore $ to whatever it was before jQuery took it over. (Useful if you also use Prototype or MooTools.)

Why does JQuery have dollar signs everywhere?, I am working on a project with quite a lot of JQuery in it. The JQuery has a lot of $ signs everywhere, for example $(document).ready(function� Why does JQuery have dollar signs everywhere? 1072. Is Safari on iOS 6 caching $.ajax results? 608. Get url parameter jquery Or How to Get Query String Values In js.

It's just a convenient character, shorter to type and easier to read than "jQuery".

There is nothing special except that it's traditionally not used to start a variable or function name, which reduces the risk or name collision.

Why does JQuery have dollar signs everywhere?, I am working on a project with quite a lot of JQuery in it. The JQuery has a lot of $ signs everywhere, for example $(document).ready(function� Since that the common abbreviation for jQuery is the dollar sign, users tend to name variables created using jQuery with a dollar sign at the beginning, so it will be easy to know where they come from later in the code, like this:

$ sign is an alias for jQuery. A short version of jQuery, a less write mechanism.

Just for an example: (in jQuery it's more complicated)

var yourFunction = function() {
    alert('a function');
}

window.Myf = yourFunction;

Now you can call yourFunction like:

Myf(); // definitely a short syntax

Webpack for Beginners: Your Step-by-Step Guide to Learning Webpack 4, Webpack ProvidePlugin There is a helpful plugin that will help us to make jQuery available in all load modules instead of having to import or require them everywhere. to load jQuery for us whenever there is a dollar sign ($) or jQuery object. is shipped out of the box with webpack so you don't have to install it yourself. Answered Mar 21, 2017. $ sign is just a valid javascript identifier which is used as an alias for jQuery. Prototype, jQuery, and most javascript libraries use the $ as the primary base object (or function). Most of them also have a way to relinquish the $ so that it can be used with another library that uses it.

Writability and Performance

When we are working on library or a programming language we should pay attention to some writability rules. Thanks to jQuery they already implemented lots of options. You can use $ or you can use jQuery or you can use _

(function (_) {
    _("#wow").click()
})(jQuery);

Or maybe you can do fancy changes, javascript identifiers are unicode so you can use Ω

(function (Ω) {
    Ω("#wow").click()
})(jQuery);

But the main idea behind it, pressing once to the keyboard is better than typing jQuery


At the other side we have performance... I just randomly opened of my project and search for $, I used 54 $ in a single javascript file.

$ is a byte.

jQuery is 6 bytes.

The difference is huge 54 * 5 = 220 bytes.

Beginning JavaScript and CSS Development with jQuery, Most of jQuery's array utility methods must be called directly, using the dollar sign see documented in the preceding list, with the exception of get() and concat(). jQuery's makeArray() method does just what the name implies — it takes any 'Love You To', 'Here, There and Everywhere', 'Yellow Submarine', 'She Said,� It's no longer needed as of Android O as the platform findViewById() uses generics to do the same. The name $ is likely inspired by jQuery.

Google is your friend: $ sign JQuery

Dollar Sign is just an alias for JQuery.

jQuery(document).ready(function(){});

OR

$(document).ready(function(){});

Web Development with jQuery, 'Love You To', 'Here, There and Everywhere', 'Yellow Submarine', 'She Said, Bird Can Sing', 'For No One', 'Doctor Robert', 'I Want to Tell You', 'Got to Get The songs variable is then passed to a call to the dollar sign method, and the� Even though I define numberFormat as "C" (currency), it does not show a dollar sign like the demo does. The spinner itself shows up, I can spin it up and down and it follows the specified max and min, but no dollar sign. I tried putting a dollar sign in the value in the HTML textbox as well as the jQuery UI start option, but no dice.

The Dollar Sign ($) and Underscore (_) in JavaScript, The dollar sign ($) and the underscore (_) characters are JavaScript Anywhere that an alphabetic character is allowed in JavaScript, But it has been the convention, although there is nothing in the language to enforce it. The dollar sign $ was chosen for the function name by the first of these libraries because it is a short one-character word, and $ was least likely to be used by itself as a function name and therefore the least likely to clash with other code in the page.

The Javascript Dollar Sign ($) Function – The Accidental Developer, (In jQuery, you can still access the underlying DOM element using .get().) Likewise, the Prototype code I cited above also returns more than just a� Some people say jQuery is a relic of the past, some people still use it day to day. Some people spend their time writing about why we don’t need jQuery. It’s surely declining in usage in the past few years: Today the JavaScript landscape has dramatically changed. That said, it’s still useful to know what jQuery can do for you.

jQuery - Quick Guide, Cross Browser Support − The jQuery has cross-browser support, and works well in IE 6.0+, FF 2.0+, jQuery's event system uses such callbacks everywhere for example − jQuery selectors start with the dollar sign and parentheses − $(). For The Elder Scrolls V: Skyrim on the PC, a GameFAQs message board topic titled "Damnit. My menu options suddenly have dollar signs before em.".

Comments
  • The $ is an alias for the jquery object
  • To wow and confuse
  • stackoverflow.com/questions/205853/… Has everything you need to know about it
  • possible duplicate of What is the meaning of "$" sign in javascript
  • var $ = jQuery
  • Unless you are using another language like PHP to populate javascript in your site using HTMLdocs, at which point that dollar sign serves the additional purpose of breaking everything since PHP does use the dollar sign to start all variables. (A reason that if you're sharing jQuery scripts for broad net use, it's kind to use the jQuery instead of $).
  • If you are making a negative vote, please don't be selfish to tell me what I did wrong. So that I can fix my mistakes if there is any!
  • 220 bytes is not really going to make any significant difference as far as speed goes. Also, it wouldn't just take up 220 bytes since the code has to go through the V8 JS engine (or other engines) and we don't know how much it's allocating for different things.
  • @GarrettSmith I was talking about networking cost. Execution of $ or jQuery is almost identical.
  • FYI: google.com.pk/… seems to give the same search results, which implies that Google doesn't actually allow the $ as a search term