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Please try following: /** * * @param {Number} b * @returns {undefined} */ Folkband.prototype.pokus = function(b){} var e= new Folkband(); e.pokus({|}); and invoke cc at "|". It offers not only properties but also methods which is (I think) not useful in this case. It is more visible with e.g. Date or some other type with a lot of methods. Thank you Product Version: NetBeans IDE Dev (Build web-main-1920-on-20150211) Java: 1.7.0_67; Java HotSpot(TM) Client VM 24.65-b04 Runtime: Java(TM) SE Runtime Environment 1.7.0_67-b01 System: Linux version 3.13.0-35-generic running on i386; UTF-8; en_US (nb)