In this article we are summarizing the most interesting parts of:

• Nadia Makarevich - Advanced React Chapter 1 "Intro to re-renders"

Lifecycle of a component

• mounting: component is created for the first time
• unmounting: react removes the component when is no needed
• re-rendering: updates the component with new information

Myth: components re-render when it's props change

• when a change over a state happens, react will re-render all the components hierarchy, props doesn't matter
• react will check props only if we use useMemo it props change it will re-render, not otherwise.