🎮 Group an array in one line

Pick a key below and watch these tasks snap into buckets — that's Object.groupBy(tasks, t => t[key]), the native replacement for the hand-written reduce everyone writes. Click any task to change it live.

Group by…

The one line that replaces the reduce


        

      

    


    
    

      
The tasks

      

        
        
      

      
Tip: click any row to cycle its status — it jumps to a different bucket instantly.

      

        

          
TaskStatusPriorityAssignee

          
        

      

    


    
    

      
Bonus · Map.groupBy — when keys aren't strings