javascript: Closures y Scope en javaScript

for(i=0;i<3;i++){
    (function(i){
       var pos = i;
       var timer = setInterval(function(){    
                       console.log("toto",pos++)  
                       if(pos==5){
                           console.info("eliminando el timer", i)
                           clearInterval(timer)                                            
                       } 
                 },1000);
    
    })(i);
}