Sometimes I have to use a hack in javascript to create a quick switch, instead of if...else:

  if(n==0) dir="north"
  else if(n==1) dir="east"
  else if(n==2) dir="south"
  else if(n==3) dir="west"

or switch:

  switch(n){
    case 0: dir="north"; break;
    case 1: dir="east"; break;
    case 2: dir="south"; break;
    case 3: dir="west"; break; 
  }

I'll use:

  dir=["north","east","south","west"][n]

I hope you find it useful in some cases too