jQuery Multidimensional Array (dynamic key) - Cannot set property of undefined

Question

Thanks you Chad for his solution, however it now appears to clear values from the array, here is a foreach on the console log which shows you my situation (followed

Answer 1

In this case it's likely that the array item hasn't been declared as a new array. Try this:

function updateLap(kartId){



if (isNaN(driverLapNumber[kartId])) {
     window.driverLapNumber[kartId] = 0;  
  }

  //ADD ONE LAP TO THE KART ID
  driverLapNumber[kartId]++;

  //ADD LAP TIME FOR CURRENT LAP NUMBER
  if(!driverLapTimes[kartId]){
       driverLapTimes[kartId] = [];
  }
  driverLapTimes[kartId][driverLapNumber[kartId]] = window.lapTime;  

}

Of course you could always put the declaration outside of this loop by creating a method to construct your array before hand.