leaflet-> enable/disable statement "easybutton"

I am using EasyButton plugin of leaflet (link). More specifically I applied EasyBar which unites several buttons.
Plus, at certain zoom levels, I add/remove various layers with zoomend function (link). Is it possible to apply a function in which I can refer to BOTH button and zoom level? I don't know the formal code way but the idea something like the following:

  map.on('zoomend', onZoomend);
    function onZoomend(){
        if(map.getZoom()<8) else if btn2.enable(){}};

**and here is my code:

map.on('zoomend', onZoomend);
function onZoomend(){


    if(map.getZoom()<8)(){
    map.addControl(info0);
    map.removeControl(info1);       
    map.removeControl(info2);   
    map.removeControl(info3); 
}       

    if(map.getZoom()==8){
    map.addControl(info1);      

    map.removeControl(info2);   
    map.removeControl(info3);   
    }           };