QuickSort

function pivot(arr,start = 0 ,end = arr.length-1){
   function swap(arr,i,j){
        var temp = arr[i];
        arr[i]=arr[j];
        arr[j]=temp;
        
    }
    
    var pivot = arr[start];
    var swapIdx = start;
    
    for(var i = start+1;i< arr.length;i++){
        if(pivot>arr[i]){
            swapIdx++;
            swap(arr,swapIdx,i);
           console.log(arr);
        }
    }
    
    swap(arr,start,swapIdx);
    return arr;
}

console.log(pivot([4,8,2,1,5,7,6,3]));