Create forms in React applications with React Final Form

Forms are difficult in React.
Luckily, there are many solutions that allow us to create React forms more easily, such as React Final Form created by Erik Rasmussen.
React Final Form is a high performance subscription-based form state management for React which is not only extremely powerful, but also lightweight (3.0k gzipped!) and easy to use.

• Create a basic form in React using react-final-form
• Disallow Submitting an Empty Form with React Final Form 'pristine' property
• Avoid Submitting a Form Twice with React Final Form 'submitting' property
• Use third party components (e.g. React Select) in React Final Form
• Validate form values with React Final Form 'validate' function