Inspired by the concept of “partial application”, we can try to return a component with props that have been partially bound from a custom hook. However, the naive implementation will return new component definition when bound props changed, and that leads to unmount-remount behaviour that we may not expect.
Can a hook return a hook?
If a hook needs to return anything it is generally documented. useEffect is a great example of a hook that might not return anything (if it does it is an effect cleanup function). Hooks can return whatever is necessary/needed/etc... They are just functions (with some rules around usage) after all.
Can I return JSX from hooks?
Returning JSX from custom hooks is kind of an anti patterns. While it works there is little reason to return JSX from custom hooks. It makes it easier to define a clear hierarchy of elements.
Can a React hook render a component?
Thinking In Hooks #
The Welcome component accepts props which is an object that contains data and returns a React element. We can then import and render this component in another component.
Can we return a component in React?
To be a component function returning JSX should be used as <Component /> and not as Component() . When a functional component is used as <Component /> it will have a lifecycle and can have a state. When a function is called directly as Component() it will just run and (probably) return something.
Can a React Hook return another Hook?
You can’t use a hook inside another hook because it breaks the rule Call Hooks from React function components and the function you pass to useEffect is a regular javascript function. What you can do is call a hook inside another custom hook.
What should a custom Hook return?
This Hook returns a three-item object: The display value is JSX, a syntax extension to JavaScript. Generally speaking, custom Hooks can return values, objects, methods, JSX, and much more.
Are hooks components?
Hooks are functions that let you “hook into” React state and lifecycle features from function components. Hooks don’t work inside classes — they let you use React without classes. (We don’t recommend rewriting your existing components overnight but you can start using Hooks in the new ones if you’d like.)
What is true custom hooks?
Custom Hooks are a mechanism to reuse stateful logic (such as setting up a subscription and remembering the current value), but every time you use a custom Hook, all state and effects inside of it are fully isolated. How does a custom Hook get isolated state? Each call to a Hook gets isolated state.
What is the purpose of a custom Hook?
Custom Hook is a JavaScript function which we create by ourselves, when we want to share logic between other JavaScript functions. It allows you to reuse some piece of code in several parts of your app.
Does React Hooks replace redux?
Although Redux isn’t always necessary, replacing it with a tool kit that was not made for the same purpose will not suffice. React Hooks are great but they do not replace Redux and they never will.
When did React 16.8 come out?
History
| Version | Release Date |
|---|---|
| 16.8.0 | 6 February 2019 |
| 16.8.6 | 27 March 2019 |
| 16.9.0 | 9 August 2019 |
| 16.10.0 | 27 September 2019 |
Do I need to rewrite all my class components with Hooks?
Do I need to rewrite all my class components? No. There are no plans to remove classes from React — we all need to keep shipping products and can’t afford rewrites. We recommend trying Hooks in new code.
How do you prevent a component from rendering in React?
If you’re using a React class component you can use the shouldComponentUpdate method or a React. PureComponent class extension to prevent a component from re-rendering.
How do I return a JSX function?
The Many Ways to Return JSX
- Returning the element directly.
- Returning with a wrapper ()
- Returning out of a ternary statement.
- Returning early.
- Conclusion.
How return JSX from React?
JSX stands for JavaScript XML, a coding standard that allows you to use JavaScript expressions and other HTML features inline. Using JSX, you can create a function and return a set of JSX elements to a variable, and that variable used is to render the elements inside the render() function in React.
Can I call a hook inside another hook?
Don’t call Hooks inside loops, conditions, or nested functions. Instead, always use Hooks at the top level of your React function, before any early returns. By following this rule, you ensure that Hooks are called in the same order each time a component renders.
Can I use hook inside useEffect?
useEffect inside of custom Hooks
More semantic code due to the function calls of the custom Hooks inside of components. Effects can be tested when used inside of custom Hooks, as we’ll see in the next section.
Do React Hooks replace higher order components?
Hooks were designed to replace class and provide another great alternative to compose behavior into your components. Higher Order Components are also useful for composing behavior. There is some obvious overlap, so do React hooks replace Higher Order Components? It’s pretty clear that they can replace some HOCs.
What do hooks return?
Generally when you create your hooks, you can return anything (array, object, symbol, etc). Even in React documentation, useFriendStatus returns a boolean value. The reason you see many hooks returning an array is to provide a way to a hook consumer to name the state & the state mutator the way you want.
Should custom Hook return array or object?
I recommend you use the hook to return an array. If you see it’s not good, then write it in object return.
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