tonyle

  1. Write some JS code in chrome and verify expected behaviour.
  2. Add a debugger statement.
  3. When the debugger pops up, go down a few frames and add debug point.
  4. Right click the frame and select restart.
  5. In the new break point, write some code in the console to modify the state.
  6. When you step through the code, it now does something else.

  var state={};

  function logic(step,err,data){  
    if(!step){
      connectToDb("somedatabase",logic.bind(state,1))
    }
    
    if(step==1){
      if(err) callback("error1")
      state.dbInstance=data
      state.dbInstance.query("someQuery",logic.bind(state,2))
    }
    
    if(step==2){
      if(err) callback("error2")
      csvExporter(data,logic.bind(state,3))
    }

    if(step==3){
      if(err) callback("error3")
      callback(data)
    }
  }
  logic()
}