in memory data store

storer.js

function storer(key, val) {
    if (arguments.length === 1)
        return this[key];
    else if (arguments.length === 0)
        return this;
    if (typeof val === "function")
        return function () {
            return val.apply(storer.bind(this, key), arguments);
        }.bind(this);
    setTimeout(console.log.bind(console, this), 1);
    return this[key] = val;
}
 
var store = storer.bind({});