# Knowledge check: React Context - Advanced React

1. **What of the below scenarios are valid for choosing context instead of local state? Select all that apply.**
    
    * <mark>The locale or language that should be used in the application’s text.</mark>
        
    * The current selection of a group of radio buttons.
        
    * <mark>The visibility state of an alert that overlays into the whole application.</mark>
        
2. **What is the problem of props drilling? Select all that apply.**
    
    * Components not knowing the local state of their parents.
        
    * <mark>Components having to pass down props all the way to the children that need to consume them.</mark>
        
    * <mark>Components receiving more props than they should.</mark>
        
3. **When creating a new piece of application state, what is the bare minimum of React APIs you would need to define it?**
    
    * <mark>Context and local state.</mark>
        
    * Context and props.
        
    * Context, props and local state.
        
4. **What happens when the** `value` **prop of the Context Provider changes?**
    
    * The Context Provider component gets recreated.
        
    * The whole component tree under the Context Provider gets re-rendered.
        
    * <mark>All the consumer components re-render with the updated value.</mark>
        
5. **What happens when you wrap a component with the** `React.memo` **API, such as** `React.memo(Component)`**. Select all that apply.**
    
    * <mark>React provides a performance optimization.</mark>
        
    * The component never gets updated no matter if there was a change in its local state or the props it receives.
        
    * <mark>Whether the component should re-render could be determined by some custom logic that uses the previous props and the current props.</mark>
        

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