Some Array and Object Prototypes

prototypes.js

const movieCategories = [
    {
        name: "Thrillers",
        videos : [
            {
                "id": 70111470,
                "title": "Die Hard",
                "boxarts": [
                    { width: 150, height: 200, url: "http://cdn-0.nflximg.com/images/2891/DieHard150.jpg" },
                    { width: 200, height: 200, url: "http://cdn-0.nflximg.com/images/2891/DieHard200.jpg" }
                ],
                "url": "http://api.netflix.com/catalog/titles/movies/70111470",
                "rating": 4.0,
                "bookmark": []
            },
            {
                "id": 654356453,
                "title": "Bad Boys",
                "boxarts": [
                    { width: 200, height: 200, url: "http://cdn-0.nflximg.com/images/2891/BadBoys200.jpg" },
                    { width: 150, height: 200, url: "http://cdn-0.nflximg.com/images/2891/BadBoys150.jpg" }

                ],
                "url": "http://api.netflix.com/catalog/titles/movies/70111470",
                "rating": 5.0,
                "bookmark": [{ id: 432534, time: 65876586 }]
            }
        ]
    },
    {
        name: "New Releases",
        videos: [
            {
                "id": 65432445,
                "title": "The Chamber",
                "boxarts": [
                    { width: 150, height: 200, url: "http://cdn-0.nflximg.com/images/2891/TheChamber150.jpg" },
                    { width: 200, height: 200, url: "http://cdn-0.nflximg.com/images/2891/TheChamber200.jpg" }
                ],
                "url": "http://api.netflix.com/catalog/titles/movies/70111470",
                "rating": 4.0,
                "bookmark": []
            },
            {
                "id": 675465,
                "title": "Fracture",
                "boxarts": [
                    { width: 200, height: 200, url: "http://cdn-0.nflximg.com/images/2891/Fracture200.jpg" },
                    { width: 150, height: 200, url: "http://cdn-0.nflximg.com/images/2891/Fracture150.jpg" },
                    { width: 300, height: 200, url: "http://cdn-0.nflximg.com/images/2891/Fracture300.jpg" }
                ],
                "url": "http://api.netflix.com/catalog/titles/movies/70111470",
                "rating": 5.0,
                "bookmark": [{ id: 432534, time: 65876586 }]
            }
        ]
    }
];

module.exports = {
    movieCategories
};

const print = (...args) => console.log(...args);

Object.prototype.z = function(func) {
    return func(this.valueOf()) && this.valueOf();
};

Array.prototype.concatAll = function() {
    return this.reduce((acc, arr) => acc.concat(arr));
};


Array.prototype.sum = function() {
    return this.reduce((acc, n) => acc + n, 0);
};

Array.prototype.uniqueValues = function() {
    return [...new Set(this)];
};

Array.prototype.groupBy = function(field) {
    return this.reduce((acc, it) => {
        acc[it[field]] = acc[it[field]] + 1 || 1;
        return acc;
    }, {});
};

Array.prototype.indexBy = function(field = 'id') {
    return this.reduce((acc, it) => (acc[it[field]] = it) && acc, []);
};

Object.prototype.reverseKeyValue = function() {
    return Object.keys(this)
        .reduce(
            (acc, k) => (acc[this[k]] = [...(acc[this[k]] || []), k], acc),
        {});
};

Object.prototype.toQueryString = function() {
    return Object.entries(this)
        .map(([k, v]) => [k, v].map(encodeURIComponent).join('='))
        .join('&');
};

Array.prototype.table = function(...props) {
    const self = [...props].length ? JSON.parse(JSON.stringify(this, [...props])) : this;

    return [Object.keys(self[0]).map(s => (''+s).toUpperCase()).join('\t')]
    .concat(self.map(obj =>Object.values(obj).join('\t')))
    .join('\n');
}

const users = [
    { id: 11, name: 'Adam', age: 23, group: 'editor' },
    { id: 47, name: 'John', age: 28, group: 'admin' },
    { id: 85, name: 'William', age: 34, group: 'editor' },
    { id: 97, name: 'Oliver', age: 28, group: 'admin' }
];

const cities = {
    Lyon: 'France',
    Berlin: 'Germany',
    Paris: 'France'
};


movieCategories
    .map(({ videos }) => videos.map(({ id }) => id))
    .concatAll()
    .z(console.log) // [ 70111470, 654356453, 65432445, 675465 ]


[1, 2, 3]
    .sum()
    .z(console.log);

[1,2,2,2,1,4,1,2,1,5]
    .uniqueValues()
    .z(console.log);

users
    .groupBy('age')
    .z(print);

const uTable = users
    .indexBy();
uTable[97].z(print);


cities
    .reverseKeyValue()
    .z(print)

cities
    .toQueryString()
    .z(print)

users
    .table()
    .z(print);

users
    .table('id', 'group', 'name')
    .z(print);