gistfile1.js

function fibs(n) {
  var generator = (function(){
    var beforeNum = 0;
    var nextNum = 1;
    var resultNum;
    var f = function() {
      resultNum = beforeNum;
      beforeNum = nextNum;
      nextNum   = resultNum + nextNum;
      return resultNum;
    };
    return f;
  })();
  var counter = 0;
  var result = [];
  while (counter < n) {
    result.push(generator());
    counter++;
  }
  return result;
}

function isPrime(n) {
  var counter = 2;
  if (n <= 1) return false;
  while (counter < n) {
    if (n % counter == 0) return false;
    counter++;
  }
  return true;
}

function fizzbuzz(n) {
  var result = [];
  var counter = 1;
  while (counter <= n) {
    if (counter % 15 == 0)
      result.push('FizzBuzz');
    else if (counter % 5 == 0)
      result.push('Fizz');
    else if (counter % 3 == 0)
      result.push('Buzz');
    else
      result.push(counter);

    counter++
  }
  return result;
}

function pyramidString(n) {
  var times = function(timesNum, f) {
    var counter = 0;
    while(counter < timesNum) {
      f(counter);
      counter++;
    }
  };
  var formatter = function (stepNum, pad) {
    var str = "";
    times(pad,         function() { str += " "; });
    times(stepNum,     function() { str += "*"; });
    times(stepNum - 1, function() { str += "*"; });
    return str;
  };
  var results = [];
  times(n, function(i){ results.push(formatter(i + 1, n - i + 1)); });
  return results.join("\n");
}

function commaize(n) {
  var numStr = "" + n;
  var tmpDigit = "";
  var digits = [];
  while (numStr.length >= 4) {
    tmpDigit = numStr.slice(-3);
    numStr = numStr.slice(0, -3);
    digits.unshift(tmpDigit);
  }
  if (numStr.length > 0) digits.unshift(numStr);
  return digits.join(',');
}