http://toys.usvsth3m.com/javascript-under-pressure/

code_party.js

/*jslint indent: 2 */
// http://toys.usvsth3m.com/javascript-under-pressure/

function doubleInteger(i) {
  'use strict';
  // i will be an integer. Double it and return it.
  return i * 2;
}


function isNumberEven(i) {
  'use strict';
  // i will be an integer. Return true if it's even, and false if it isn't.
  return (i % 2) === 0;
}

function getFileExtension(i) {
  'use strict';
  // i will be a string, but it may not have a file extension.
  // return the file extension (with no period) if it has one, otherwise false
  if (/\./.test(i)) {
    return i.split(/\./).pop();
  }
  return false;
}

function longestString(i) {
  'use strict';
  // i will be an array.
  // return the longest string in the array
  return i.sort(function (a, b) {
    if (typeof b !== 'string') {
      return 1;
    }
    return (a.length > b.length) ? 1 : -1;
  }).pop();
}

var arraySum = function tmp(i) {
  'use strict';
  // i will be an array, containing integers, strings and/or arrays like itself.
  // Sum all the integers you find, anywhere in the nest of arrays.
  var e, s = 0;
  for (e = 0; e < i.length; e += 1) {
    if (typeof i[e] === 'number') {
      s += i[e];
    } else if (typeof i[e] === 'object' && i[e].length) {
      s += tmp(i[e]);
    }
  }
  return s;
};