dubbio array.sort()

[whisher]

function compareNumbers(a, b) {
  if(a[0] > b[0])
    return 1;
  if(a[0] < b[0])
    return -1;
  return 0;
}
var pippo= [[1,'P','primo'],[3,'D','secondo'],[10,'A','terzo'],[7,'C','quarto']]; //array originale 
alert(pippo.sort(compareNumbers)); 

sort