gistfile1.js

var target = {};

target.show = function () {
    [].slice.call(arguments).forEach(function (arg) {
        console.log(arg);
    });
};

target.wrap = function(name, wrapper) {
    var context = Object.create(target);
    context[name] = target[name].bind(target);
    
    target[name] = function () {
        var args = [].slice.call(arguments);
        wrapper.apply(context, args);
    };
    
    return target;
};

var component = Object.create(target);

component.wrap("show", function (something, somethingElse) {
    console.log("pre show");
    this.show(something, somethingElse);
    console.log("post show");
});

component.show("Something", "Something else");