Meme-Generator

• Design
• Events
• States
• Side Effect
• Forms

props vs state

1. How would you describe the concept of "state"? A way for React to remember saved values from within a component. This is similar to declaring variables from within a component, with a few added bonuses (which we'll get to later)

2. When would you want to use props instead of state? Anytime you want to pass data into a component so that component can determine what will get displayed on the screen.

3. When would you want to use state instead of props? Anytime you want a component to maintain some values from within the component. (And "remember" those values even when React re-renders the component).

4. What does "immutable" mean? Are props immutable? Is state immutable? Unchanging. Props are immutable. State is mutable.

5. Functional State Update

   • Note: if you ever need the old value of state
   • to help you determine the new value of state,
   • you should pass a callback function to your
   • state setter function instead of using
   • state directly. This callback function will
   • receive the old value of state as its parameter,
   • which you can then use to determine your new
   • value of state.