Map example with @create and @initialize

map.js

import Symbol from "@symbol";

let list = Symbol.new();

export class Map {
    constructor () {
        // nothing to do here actually
    },

    // this would be implicit unless specified
    static [@@create] (list) {
        var instance = Object.create(Map.prototype);
        Map[@@initialize].apply(instance, arguments);
        return instance;
    }

    static [@@initialize] (list) {
        if ( list == null ) {
            list = [];
        }

        // argument validity checks here.

        this[list] = list || [];
    }

    get (key) {
        if ( !this[list] ) {
            throw new TypeError("Map.prototype.get must be called on a Map instance");
        }

        for ( let i = 0; i < this[list].length; i++ ) {
            if ( this[list][0] === key ) {
                return this[list][1];
            }
        }

        return null;
    }
};