Memoization For Improved Application Performance

memoize

function memoize(fn) {
  fn.memoize || (fn.memoize = {});
  return function(arg) {
    if (fn.memoize.hasOwnProperty(arg)) {
      console.log('memoized //-> %s', arg);
      return fn.memoize[arg];
    }
    else {
      console.log('computed //-> %s', arg);
      fn.memoize[arg] = fn(arg);
      return fn.memoize[arg];
    }
  };
}

function expensiveCompute(num) {
  return num;
}

var compute = memoize(expensiveCompute);
compute(1);
compute(2);
compute(3);
compute(3);
compute(2);