sortBy.js

var sortBy = function(arr, ...sortByArgs){
 arr.sort(function(a,b){
   var sortResult = 0;
   sortByArgs.forEach(function(arg){
     if (sortResult != 0) return;
      if(Object.values(arg)[0] == 'desc'){
        var propName = Object.keys(arg)[0];
       if (a[propName] > b[propName]){ 
       sortResult = -1;
       return;
       }
      if (a[propName] < b[propName]) {
       sortResult = 1;
        return;
       }
      }
      else {
     if (a[arg] < b[arg]){ 
       sortResult = -1;
       return;
       }
      if (a[arg] > b[arg]) {
       sortResult = 1;
        return;
       }
       }
    });
    
    return sortResult;
  });
};