Immediately-Invoked Puzzler

 

The Poplar Puzzle-makers weren’t too impressed. They barely noticed your simple and beautiful array of functions, and were only sort of “meh” on the usage of the array as a queue. But now, they’ve sent you a puzzle, complete with a new set of functions to use on that puzzle. So, to display your overwhelming array and function expression mastery, alert the answer to the following question.

“What is obtained when the result of passing 9 into function 4 is then passed into the function whose array index matches the result of passing 3 into function 2?”

var puzzlers = [
  function ( a ) { return 8*a - 10; }, 
  function ( a ) { return (a-3) * (a-3) * (a-3); }, 
  function ( a ) { return a * a + 4; },
  function ( a ) { return a % 5; }
];

To really impress the puzzle builders, the expression used in your alert should:

1. Involve no manual calculation or hard-coded math on your part.
2. Use indices of arrays to access functions.
3. Use parentheses to pass in parameters to immediately-invoking functions.
4. Use just one line of code.

var puzzlers = [
  function ( a ) { return 8*a - 10; }, 
  function ( a ) { return (a-3) * (a-3) * (a-3); }, 
  function ( a ) { return a * a + 4; },
  function ( a ) { return a % 5; }
];

alert((puzzlers[(puzzlers[1])(3)])((puzzlers[3])(9)));