React

Why context? A component tree can quickly grow. The root component has many children, the children have many children and so on. What if you want to pass information that is considered global to a tree or subtree of components? For example what language these components should use. Or what the username is. You could use props of course, but it seems unnessary to pass on the same information over and over again to each component. This is where the context comes in. Pre context In this exampl...

Preparation First make sure that you have the latest version of node.js installed. The easiest way to do that is to download the installer package from nodejs.org. npm is the node package manager. It is updated more frequently than node itself. To make sure your have the latest version, at the prompt type npm install npm@latest -g. Create-react-app Now change to the root folder where you want the app to live and type npx create-react-app [yourapp] to create the initial app. npx was installed wh...