Code Results from Under Pressure

underpressure.js

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

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

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();
    if(ext == i) return "";
    return ext;
    
}

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

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.
    
    var sum = 0
    
    for (var x in i) {
        if (Array.isArray(i[x])) {
            sum += arraySum(i[x])
        } else if (typeof(i[x]) === 'number') {
            sum += i[x]
        }
    }
    return sum
}