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How does React know when to update?
React has to run its diffing algorithm on each of those components to check whether it should update the UI. All your code in these render functions or function components will be executed again.
What design pattern is React?
Higher-Order Component (or HOC) is essentially a design pattern, also known as a Decorator Pattern. In ReactJS, a HOC is a component that wraps another component by adding extra functionality or extra properties. This allows abstraction from some commonly used logic and keeps your code DRY.
What method do you use to update state React?
setState() enqueues changes to the component state and tells React that this component and its children need to be re-rendered with the updated state. This is the primary method you use to update the user interface in response to event handlers and server responses.
Which is the most common pattern in react?
There are some powerful patterns which have emerged, due to the ability to pass functions as props. A very common pattern is passing a function down to a child component as a prop, which can update the parent component’s state, and then calling it within that child component.
Which is the latest version of ReactJS?
Latest version while still respecting the semver in your package.json: npm update . So, if your package.json says “react”: “^15.0.0” and you run npm update react your package.json will now say “react”: “^15.6.2” (the currently latest version of react 15).
Are there any patterns for accessing props in react?
There are a couple of patterns we can use for accessing prop values in our components. Props can be accessed as an entire object which is usually called “props”. Or they can be destructured, since props will always be an object, into separate variables.
Which is the correct way to name React components?
Any component that you create for React should therefore be named in Pascal case, or upper camel case. This translates to names without spaces and the capitalizing the first letter of every word.