njseries_02_02.js

class Router {
    ...
    
    route(specs, methods, handlers){
        if(this._prefix !== ''){
            specs = `${this._prefix}/${specs}`
        }
        handlers = this._cleanHandlers(handlers)
        this._routes.push({ 
            methods,
            ...this._patternToRegex(specs),
            handlers
        })
    }

    group(prefix, fn){
        this._prefix = prefix
        fn(this)
        this._prefix = ''
    }

    all(specs, handlers){
        this.route(specs, ['GET', 'POST', 'PUT', 'DELETE'], handlers)
    }

    ...
}