A thought on React Context default value

Introduction It’s been about a year since React Context API is out. This is powerful and it’s even more powerful with upcoming React Hooks API, namely useContext. Please check out official documents to learn them in detail. https://reactjs.org/docs/context.html https://reactjs.org/docs/hooks-intro.html Now, this very short article is just about the default value of a context. When you create a context, you pass a default value in the first argument. The defaultValue argument is only used when a component does not have a matching Provider above it in the tree. This can be helpful for testing components in isolation without wrapping them. Note: passing undefined as a Provider value does not cause consuming components to use defaultValue.