hashtabler.js/src/hashtabler.js

Library with a hash table.

const { Listr } = require('listr.js');
const Hash = require('object-hash');

let Hashtabler = (function(){
    let table = [];

    return {
        /**
         * Insert object
         *
         * @param {Object} object
         * @param {String} key
         * @returns {String} key
         */
        insert: function (object, key = null) {
            key = key || this.calculateKey(object);

            if (this.existsKey(key)) {
                (table[key]).append(object);
            } else {
                let list = new Listr();

                list.append(object);
                table[key] = list;
            }

            return key;
        },
        /**
         * Find key
         *
         * @param {String} key
         * @returns {Listr|undefined} Returns the object if key exists.
         */
        get: function (key) {
           return table[key];
        },
        /**
         * Return true if key exists
         *
         * @param {String} key
         * @returns {boolean}
         */
        existsKey: function (key) {
            return key in table;
        },
        /**
         * Calculate new key
         *
         * @param {Object} object
         * @returns {String}
         */
        calculateKey: function (object) {
            return Hash(object);
        },
        /**
         * Delete object
         *
         * @param {String} key
         * @returns {boolean} Returns true if key are deleted.
         */
        delete: function (key) {
            let exists = false;

            if (this.existsKey(key)) {
                delete table[key];
                exists = true;
            }

            return exists;
        },
        /**
         * Delete all objects
         *
         * @returns {boolean}
         */
        clear: function () {
            table = [];

            return true;
        }
    };
});

module.exports.Hashtabler = Hashtabler;