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>');
The whole code is just a function call with two arguments:
;(function( $, $$ ){ 'use strict';
// skipped
})(
typeof jQuery !== 'undefined' ? jQuery : null,
typeof cytoscape !== 'undefined' ? cytoscape : null
);
The first argument is jQuery
global variable (or null
, if jQuery
is undefined), and the second is cytoscape
global variable (or null
, if is undefined).
In the browser developer tools console - at least in Firefox, IE11, (can't test lesser IE's), Edge and Chrome - $
and $$
do have particular functions (if the page hasn't defined those vars) - see MDN Documentation for Helper Command in the Web Developer Tools Console.
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