JS anti shake and throttling

/  Throttling function 
function throttle(callback, wait) {
    
   let start = 0 ;
   return function(e){
    
    let now = Date.now()
    if(now - start >= wait){
    
        callback.call(this,e);
        start = now;
    }
   }
}

//  Anti shake function 
function debounce(callback,time){
    
    var timeout = null;
    return function(e){
    
        if(timeout != null){
    
        clearTimeout(timeout)
        }
        // Start timer 
        timeout = setTimeout(()=>{
    
           callback.call(this,e)
           timeout = null;
        },time)
    }
}