gistfile1.txt

memoizer = {};

function memosin(arg){
  if( memoizer[arg] ){
    return memoizer[arg]
  }
  else{
    memoizer[arg] = mysin(arg)
    return memoizer[arg]
  }
}

function mysin(arg){
  console.log('Recomputing sin for ' + arg)
  return Math.sin(arg)
}