Render Logic: Pure Components Flashcards
What are the two types of logic in React components?
The two types of logic in React components are render logic and event handler functions.
How is render logic defined, and what is its purpose?
Render logic is the code that resides at the top level of component functions and describes how the component’s view should look. It is responsible for rendering the component’s output.
What is an event handler function, and what is its purpose?
An event handler function is a piece of code that executes in response to an event, such as user interactions. Its purpose is to handle events and perform actions based on them, like updating state, making HTTP requests, or navigating the application.
What does it mean for a function to be pure in the context of React?
In React, for a function to be pure, it should have no side effects, meaning it does not depend on or modify data outside its scope. When given the same input, a pure function should always return the same output.
Why is it important for render logic in React components to be pure?
Render logic in React components must be pure to ensure that, given the same props, the component consistently returns the same output (JSX). This requirement prevents side effects and helps maintain a predictable and bug-free rendering process.
What are some examples of side effects in programming?
Side effects in programming include interactions with the outside world, such as making network requests, manipulating the DOM, setting timers, and mutating objects or variables outside a function’s scope.
Which React rule forbids mutating props, and why is it important?
React forbids mutating props because doing so would introduce side effects into render logic, violating the requirement for render logic to be pure. Keeping props immutable ensures consistent behavior.
How can side effects be safely incorporated into React components?
Side effects can be safely incorporated into React components by using event handler functions or the ‘useEffect’ hook. Event handler functions are not considered render logic, and ‘useEffect’ allows for side effect registration in a controlled manner.
