Returns an object with the same hierarchy of properties as the source object, but on invoking any of its properties, a getter is called instead. Might be useful to someone, somewhere, somehow. 😋

createProxy.js

/**
 * @name constructProxy
 *
 * @description
 * From a source object, generates and returns a proxy object. When a property
 * in the source object is invoked, it runs the function provided as the getter,
 * passing it the name of the property invoked as well as the full expression
 * that was invoked. Properties that are of type 'object' are simply copied over.
 *
 */

function constructProxy (source, proxy, getter, expressionPrefix) {
    var prop,
        props = [];

    for (prop in source) {
        props.push(prop);
    }

    props.forEach(function (prop) {
        var sourceValue = source[prop];

        if (typeof sourceValue === 'object') {
            proxy[prop] = {};
            constructProxy(sourceValue, proxy[prop], getter, /* expressionPrefix: */ ((expressionPrefix || '') + prop + '.'));
        }
        else {
            Object.defineProperty(proxy, prop, {
                get: function () {
                    return getter(prop, /* path: */ ((expressionPrefix || '') + prop));
                }
            });
        }
    });
}