What does it mean $ and $$ in javascript?

Question

Please explain the meaning of the $ and $$

This is sample code use $ and $$: https://github.com/cytoscape/cytoscape.js-qtip/blob/master/cytoscape-qtip.js

what mean this code use $:

var $qtipContainer = $('<div></div>');

Answer

The whole code is just a function call with two arguments:

;(function( $, $$ ){ 'use strict';
  // skipped
})(
  typeof jQuery !== 'undefined' ? jQuery : null,
  typeof cytoscape !== 'undefined' ? cytoscape : null
);

The first argument is jQuery global variable (or null, if jQuery is undefined), and the second is cytoscape global variable (or null, if is undefined).

Accepted Answer

The whole code is just a function call with two arguments:;(function( $, $$ ){ 'use strict';  // skipped})(  typeof jQuery !== 'undefined' ? jQuery : null,  typeof cytoscape !== 'undefined' ? cytoscape : null);The first argument is jQuery global variable (or null, if jQuery is undefined), and the second is cytoscape global variable (or null, if is undefined).

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Answer