solution for http://toys.usvsth3m.com/javascript-under-pressure/ - ugly code

javascript-under-pressure.js

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

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

function getFileExtension(i) {
    // 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
    var ext = i.split('.').pop()   
    return ext==i?false:ext
}

function longestString(i) {
    // i will be an array.
    // return the longest string in the array
    var l = 0;
    var max = 0
    for (var x = 0; x < i.length; x++) {
        if (typeof(i[x])=='string')
            if (i[x].length > max) {
                l = x;
                max = i[x].length
            }
    }
    return i[l];
}

function arraySum(i) {
    // 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.
 function flatten(array){
    var flat = [];
    for (var i = 0, l = array.length; i < l; i++){
        var type = Object.prototype.toString.call(array[i]).split(' ').pop().split(']').shift().toLowerCase();
        if (type=='array')  flat = flat.concat(flatten(array[i]))
        if (type=='number') flat.push(array[i])
    }
    return flat;
  }
  return flatten(i).reduce(function(a,b){return a+b})
}