What is the meaning of "$" sign in JavaScript

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In the following JavaScript code there is a dollar ($) sign. What does it mean?

$(window).bind('load', function() {
    $('img.protect').protectImage();
});

Your snippet of code looks like it's referencing methods from one of the popular JavaScript libraries (jQuery, ProtoType, mooTools, and so on).

There's nothing mysterious about the use of $ in JavaScript. $ is simply a valid JavaScript identifier.

JavaScript allows upper and lower letters, numbers, and $ and _. The $ was intended to be used for machine-generated variables (such as $0001).

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. In that case you use jQuery instead of $. In fact, $ is just a shortcut for jQuery.

Meaning, indicating an association between two entities, typically one of belonging. what definition: 1. used to ask for information about people or things: 2. used in questions that show you are…. Learn more.


That is most likely jQuery code (more precisely, JavaScript using the jQuery library).

The $ represents the jQuery Function, and is actually a shorthand alias for jQuery. (Unlike in most languages, the $ symbol is not reserved, and may be used as a variable name.) It is typically used as a selector (i.e. a function that returns a set of elements found in the DOM).

Definition, expressing the relationship between a direction and a point of reference. 'meaning' The meaning of a word, expression, or gesture is the thing or idea that it refers to or represents.


From another answer:

A little history

Remember, there is nothing inherently special about $. It is a variable name just like any other. In earlier days, people used to write code using document.getElementById. Because JavaScript is case-sensitive, it was normal to make a mistake while writing document.getElementById. Should I capital 'b' of 'by'? Should I capital 'i' of Id? You get the drift. Because functions are first-class citizens in JavaScript, you can always do this:

var $ = document.getElementById; //freedom from document.getElementById!

When Prototype library arrived, they named their function, which gets the DOM elements, as '$'. Almost all the JavaScript libraries copied this idea. Prototype also introduced a $$ function to select elements using CSS selector.

jQuery also adapted $ function but expanded to make it accept all kinds of 'selectors' to get the elements you want. Now, if you are already using Prototype in your project and wanted to include jQuery, you will be in problem as '$' could either refer to Prototype's implementation OR jQuery's implementation. That's why jQuery has the option of noConflict so that you can include jQuery in your project which uses Prototype and slowly migrate your code. I think this was a brilliant move on John's part! :)

WHAT'S THE MEANING OF THIS? (phrase) definition and synonyms , expressing the relationship between a general category or type and the thing being specified which belongs to such a category. Definition of meaning. 1a : the thing one intends to convey especially by language : purport Do not mistake my meaning. b : the thing that is conveyed especially by language : import Many words have more than one meaning.


The $() is the shorthand version of jQuery() used in the jQuery Library.

Of, following a noun derived from or related to a verb. Meaning is what a word, action, or concept is all about — its purpose, significance, or definition. If you want to learn the meaning of the word meaning, you just need to look it up in the dictionary. Meaning represents something's intent or purpose.


As all the other answers say; it can be almost anything but is usually "JQuery".

However, in ES6 it is a string interpolation operator in a template "literal" eg.

var s = "new" ; // you can put whatever you think appropriate here.
var s2 = `There are so many ${s} ideas these days !!` ; //back-ticks not quotes
console.log(s2) ;

result:

There are so many new ideas these days !!

Meaning, where the head of the phrase is a predicative adjective. The definition, (used, especially before a noun, with a specifying or particularizing effect, as opposed to the indefinite or generalizing force of the indefinite article a or an): the book you gave me; Come into the house.


For, indicating the relationship between a verb and an indirect object. “It depends on what the meaning of the word ‘is’ is. If the—if he—if ‘is’ means is and never has been, that is not—that is one thing. If it means there is none, that was a


6 words with meanings that will surprise you, "it would be just a quarter of three in New York" What Does My Name Mean? Do you want to know the meaning behind your name? Onomastics or onomatology is the study of proper names of all kinds - including the origins of names. A branch of onomastics is called anthroponomastics or anthroponymy. It's the study of "anthroponyms" which originates from the Greek words anthropos (meaning human) and


The Meaning of Life (Stanford Encyclopedia of Philosophy), the formal statement of the meaning or significance of a word, phrase, idiom, etc., as found in dictionaries. An online dictionary resource, such as Dictionary.com,  The question of the meaning of life is perhaps one that we would rather not ask, for fear of the answer or lack thereof. Historically and still today, many people believe that humankind is the creation of a supernatural entity called God, that God had an intelligent purpose in creating us,