Navigable Typescript object using arrows

typescript-navigable-object-example.ts

class NavigableObject<T> {
    constructor(private obj: T, private path: string[] = []) { }

    To<R>(p: (x: T) => R): NavigableObject<R> {
        return new NavigableObject<R>(p(this.obj),
                       this.path.concat(this.getPropName(p)));
    }

    getPath() {
        return this.path;
    }

    private static propertyRegEx = /\.([^\.;]+);?\s*\}$/;

    private getPropName(propertyFunction: Function) {
        return NavigableObject.propertyRegEx.exec(propertyFunction.toString())[1];
    }
}

let test = {
    a: {
        a1: 1,
        a2: 1
    },
    b: {
        b1: 1,
        b2: 2
    }
}

let navigableTest = new NavigableObject(test);

navigableTest.To(m => m.b).To(m => m.b2).getPath(); // = ["b", "b2"]

navigableTest.To(m => m.a).To(m => m.a2).getPath(); // = ["a", "a2"]