hello world AOP - proxy

book-collection-aop-proxy.js

...
function Logger(target, pattern) {
    return new Proxy(target, {
        get: function(obj, prop) {
            var value, name;
            if (!Reflect.has(obj, prop)) {
                return;
            }
            name = target.name || target.constructor.name;
            value = Reflect.get(obj, prop);
            if (typeof value === 'function') {
                value = function() {
                    let result = Reflect.apply(obj[prop], obj, arguments);
                    if (pattern.exec(prop)) {
                        console.log(`Function ${prop} retrieved result ${JSON.stringify(result)}`);
                    }
                    return result;
                }.bind(obj);
            }
            return value;
        }
    });
}

class BookCollection {
    getNameByISBN(isbn) {
        return {
            isbn: isbn,
            name: 'Proxy + Decorators = AOP'
        };
    }
}
BookCollection.prototype = Logger(BookCollection.prototype, /^get.*/);
console.log(new BookCollection().getNameByISBN('sdaf'));
// Function getNameByISBN retrieved result {"isbn":"some-isbn","name":"Proxy + Decorator = AOP"}
// Object {isbn: "some-isbn", name: "Proxy + Decorator = AOP"}