Function Expressions and Instant Invocations.

gistfile1.txt

var listOfSharks = ["Sea Pain", "Great Wheezy",
                    "DJ Chewie", "Lil' Bitey",
                    "Finmaster Flex", "Swim Khalifa",
                    "Ice Teeth", "The Notorious J.A.W."];
var listOfTargets = ["icicle bat", "snow yeti",
                     "killer penguin", "frost tiger",
                     "polar bear", "iceberg",
                     "blue witch", "wooly mammoth"];
function makeTargetAssigner( sharks, targets ){
  return function (shark) {
    var target = '';
    for (var i = 0; i < sharks.length;i++) {
      if (sharks[i] == shark) {
       	 target = targets[i];
      }
 		}
    alert(
        "What up, "+shark+"!\n" +
		"There've been "+target+" sightings in our 'hood!\n" +
		"Time for a swim-by lasering, homie!");
  };
}
var getTargetFor = makeTargetAssigner(listOfSharks, listOfTargets);

getTargetFor("Ice Teeth");