javascript design patterns pdf
// https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwit8ovGsvjxAhUuxzgGHVQ2B2gQFjAAegQIAxAD&url=https%3A%2F%2Faddyosmani.com%2Fresources%2Fessentialjsdesignpatterns%2Fbook%2F&usg=AOvVaw2s9AbGszbiQtsy9OLDBmTv