Wacky Randomizer

wackyRandomizer.js

/*
 Iterates every Math function in random order, with random arguments,
 then randomly adds or subtracts each result and rounds the grand total.

 Typical output:

+ tan(9)
+ sqrt(0)
- sin(0)
+ random()
+ round(6)
- min(8, 1)
+ pow(3, 9)
+ max(9, 2)
+ log(1)
+ floor(4)
- exp(6)
+ cos(5)
+ ceil(9)
+ atan2(10, 9)
- atan(1)
+ abs(1)
---------------------
19308
*/

function generateRandomNumber() {
  function usefulNumber(value) {
    return (typeof value == "number") &&
    !isNaN(value) &&
    value != Number.POSITIVE_INFINITY &&
    value != Number.NEGATIVE_INFINITY;
  }

  var mathFunctions = Object.getOwnPropertyNames(Math).filter(function(prop) { return typeof Math[prop] == 'function' });
  var shuffledFunctions = mathFunctions.sort(function() { return Math.floor(Math.random()*2.999) -1 });

  var result = 0, i = shuffledFunctions.length, symbol = "1st"; 
  while(i--) {
    var fn = shuffledFunctions[i], first = true;
    var l = Math[fn].length, args = [];
    while(l--) {
      args.push(Math.round(Math.random()*10));
    }

    var thisResult = (Math[fn]).apply(Math, args);

    if(usefulNumber(thisResult)) {
      (Math.round(Math.random()) || symbol == "1st") ?
        (result += thisResult, symbol = "+") :
        (result -= thisResult, symbol = "-");
      var output = symbol + " " + fn + "(" + args.join(', ') + ")";
      console.log(output);
    }
  }

  console.log("---------------------");
  return Math.round(result);
}