remove attached event javascript function name not defined code example

Example: javascript remove event listener not working

var someEventHander=function(){
	console.log("do something");
}
var handlerCopy=someEventHandler.bind(var1,var2)
//add listener
document.getElementById("someid").addEventListener('click',handlerCopy,true);
//remove listener 
document.getElementById("someid").removeEventListener('click',handlerCopy,true);