Mastering Flutter helps the reader master the popular Flutter framework for rapid cross-platform app development.Mobile applications grow in popularity every year, and developers keep looking for new tools to help them design them. A Google-backed, free and open-source mobile user interface framework, Flutter, stands out among these products.Flutter enables developers to construct a native mobile app using just a single line of code. This implies that one could design two different applications using the same programming language and codebase (iOS and Android).