Exams - Cloud Manager

/* Write a program that reads file information from the console and groups the files according to their extensions
in the format <file-extension> <[file1, file2, … ]> <total memory in MB>, where total memory is the sum of
the sizes of the respective files. Extension lines should be sorted by the extension names. The files themselves
should also be ordered alphabetically. Finally, the information is converted to JSON format and printed.
The input is passed as array of several strings: each string will contain information about a file in
the format <name> <extension> <memory>, separated by spaces. Print the file information in JSON format.
The memory should be printed with 2 places after the decimal point.*/

"use strict";

function formatFiles(arr) {
    var cloudMap = {};
    for (var i = 0; i < arr.length; i += 1) {
        arr[i] = arr[i].split(/\s+/g).filter(Boolean);
        var fileName = arr[i][0];
        var extension = arr[i][1];
        var memory = parseFloat(arr[i][2]);

        if (!(extension in cloudMap)) {
            cloudMap[extension] = { 'files': [], 'memory': 0 };
        }
        cloudMap[extension].files.push(fileName);
        cloudMap[extension].memory += memory;
    }

    function sortingObject(object) {
        var sortedKeys = Object.keys(object).sort();
        var sortedObj = {};
        for (var i = 0; i < sortedKeys.length; i += 1) {
            if (object.hasOwnProperty(sortedKeys[i])) {
                sortedObj[sortedKeys[i]] = {};
                sortedObj[sortedKeys[i]].files = object[sortedKeys[i]].files.sort();
                sortedObj[sortedKeys[i]].memory = object[sortedKeys[i]].memory.toFixed(2);
            }
        }

        return sortedObj;
    }

    cloudMap = sortingObject(cloudMap);

    return JSON.stringify(cloudMap);
}

console.log(formatFiles([
    'sentinel .exe 15MB',
    'zoomIt .msi 3MB',
    'skype .exe 45MB',
    'trojanStopper .bat 23MB',
    'kindleInstaller .exe 120MB',
    'setup .msi 33.4MB',
    'winBlock .bat 1MB'
]));

console.log(formatFiles([
    'eclipse .tar.gz 198.00MB',
    'uTorrent .gyp 33.02MB',
    'nodeJS .gyp 14MB',
    'nakov-naked .jpeg 3MB',
    'gnuGPL .pdf 5.6MB',
    'skype .tar.gz 66MB',
    'selfie .jpeg 7.24MB',
    'myFiles .tar.gz 783MB'
]));