JSAPI.info

YUI.constructor

YUI (3.3.0) - see full source 
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    var YUI = function() {
        var i = 0,
            Y = this,
            args = arguments,
            l = args.length,
            instanceOf = function(o, type) {
                return (o && o.hasOwnProperty && (o instanceof type));
            },
            gconf = (typeof YUI_config !== 'undefined') && YUI_config;
 
        if (!(instanceOf(Y, YUI))) {
            Y = new YUI();
        } else {
            // set up the core environment
            Y._init();
 
            // YUI.GlobalConfig is a master configuration that might span
            // multiple contexts in a non-browser environment.  It is applied
            // first to all instances in all contexts.
            if (YUI.GlobalConfig) {
                Y.applyConfig(YUI.GlobalConfig);
            }
 
            // YUI_Config is a page-level config.  It is applied to all
            // instances created on the page.  This is applied after
            // YUI.GlobalConfig, and before the instance level configuration
            // objects.
            if (gconf) {
                Y.applyConfig(gconf);
            }
 
            // bind the specified additional modules for this instance
            if (!l) {
                Y._setup();
            }
        }
 
        if (l) {
            // Each instance can accept one or more configuration objects.
            // These are applied after YUI.GlobalConfig and YUI_Config,
            // overriding values set in those config files if there is a '
            // matching property.
            for (; i < l; i++) {
                Y.applyConfig(args[i]);
            }
 
            Y._setup();
        }
 
        Y.instanceOf = instanceOf;
 
        return Y;
    };