Useref vs usestate reddit. useMemo is a bit more complicated.

Useref vs usestate reddit May 5, 2023 · Only useRef can be used in yet another field of application to gain direct access to React components or DOM elements. createRef())[0]. In this example, it's being used to keep track of a timer that's perhaps cleared and reassigned with new timers in other places in the component. Performance between useRef and useState for animation . Posted by u/u-copycat - 1 vote and no comments useState is for when you want to have some value that’s persisted between renders that does trigger a rerender when it changes Another use case for useRef is when you need to interact imperatively with some element. A number, an object, anything you want. useRef can reference child elements (via “ref={}”), useState can’t. People are uncertain about when and why they should use it. To access DOM elements To store mutable values that persist between component re-renders The hook accepts an argument called initialValue and returns a mutable ref object that contains a special current property that stores the passed argument for the lifetime of the component. In this blog, we’ll explore the key differences between useState and useRef and when to use each. For child React components, ref={} refers to the child component itself. The useState Hook returns an array with two items. I could use some clarification on this myself. to's best submissions. While a simple state update is not much of a performance hit, if there are fields that update depending on that state, there may be a large performance hit, as there was in our case. Questions and… May 9, 2023 · Overall, the useState, useEffect, and useRef hooks provide a robust set of tools for managing state and side effects in React. That guy is an idiot. Else use useRef. In this case I would go for useMemo because it is semantically closer to what is intended, but useRef would work as well 235K subscribers in the learnjavascript community. You could change the value of a ref 100x, but if a setState isn’t called, or new props aren’t passed into the component, it won’t render the value in that ref to the UI. So if your variable is something that decides a view layer render, go with useState. This works because useRef() creates a plain JavaScript object. useRef is like a box where you can store something. Related Topics Nope. 2. If you want to render something when it changes, use useState, if not, use useRef. For every keystroke you will render each element. They say it shouldn't be overexploited. It's not a new concept, but uncontrolled vs controlled has drawbacks between the two approaches. In this article, we’ll delve into the differences between useRef and useState, exploring their purposes, use cases, and best Apr 23, 2023 · We have had issues with performance on large forms (forms with lots of inputs) and using state. The demo above is something we want to bring to WebStorm :) Here is the list of shortcuts we aim to provide: ust - useState() ue - useEffect() uc - useContext() ucb - useCallback() um - useMemo() ur - useRef() urd - useReducer() You can pass initial state to useState() either as value or as function/lambda, like so: useState(initialVal) useState(() => computeVal(fromOtherVal)) In contrast, useReducer()'s second argument is always a value, and function/lambda can be passed as third argument useReducer(reducer, initialVal) useReducer(reducer, fromOtherVal, computeVal) 2. For example, lets look at the following code snippet: Jun 5, 2019 · useState causes re-render, useRef does not. Oct 13, 2023 · Performance Of Useref Vs Usestate In 2023. Sep 22, 2021 · When I discuss React with people, I often hear that others find useRef to be confusing. Posted by u/u-copycat - 1 vote and no comments I'm not saying useRef can't be used here but what we are takling about in this specific instance is uncontrolled vs controlled components for inputs. In general, useRef is more performant than useState because it does not trigger re-renders when its value is updated. check it out ) Why use useMemo and add unnecessary complexity to your app when you can achieve the same result with useRef when it comes to input rerenders. . I was wondering if there was a preference between these two approaches. In… Check if similar behaviour can be replicated using useRef. But, the video basically says that if you don't use some value inside the JSX you can use useRef instead of useState. On the other hand, updating the value of a state variable with useState triggers a re-render of the component. 1. value) Dont forget to spread out the old state I’m taking a dump and on my phone you get the idea Jan 30, 2024 · If you want to update data and cause UI updates, go with useState. test. Not always a useState will fit your requirement, as setState will take effect on the next render. For child DOM elements, ref={} refers to the DOM element itself. Others stick to using useState. Aug 27, 2024 · countにはuseStateの引数が初期値として格納されます。 useRefとは. One of its feature is to generate new cells and save their inputs. But it can also be used like a state variable except it doesn't trigger a rerender. A simple var won't keep its value when the component is rerendered. Understanding when to use each hook is crucial for writing efficient and maintainable React components. value; // perform validations, other ops, etc View community ranking In the Top 10% of largest communities on Reddit useRef vs useState in react. May 11, 2020 · 본 포스트에서는 React v16. 目的: コンポーネントの状態を保持・管理するために使用します。 動作: You can treat it like useState but it doesn’t invoke a re-render; basically persisting state without causing re-render. May 21, 2024 · In this example, useState initializes the count at 0 and updates it each time the button is clicked, causing the component to re-render. Every time I make a project I use useState and useEffect and never touch any of the other hooks. I CAN develop in react as long as I am needed to, but I'm just not interested anymore. you can provide an array of values as a second argument and react will run its callback only when any of Apr 21, 2022 · In the first, we store in state via useState() in the second, we store it in a reference via useRef() If you don’t have much experience using useRef() this way, it might not be obvious how these May 19, 2023 · In this example, we use useState to manage the email, password, and validation state. A mirror of dev. The way you're using useState() and useRef() are fundamentally the same, however the React devs recommend against directly changing the state value. In that case: Have a boolean useState visibility variable; Have a numeric useRef position variable. The useState hook lets you add state to functional components. I guess using useRef has better Differences between useState() and useRef(): useState triggers re-render, useRef does not. I have two choices to move object in useFrame. Some are concerned with multiple component renders and use useRef. In general, if you want to validate values input from user (e. For useState: Allows functional components to have their own state. Above code "abuses" useState to persist the returned ref from React Aug 26, 2019 · @bfricka Actually my apologies, there was one very important thing I forgot. encapsulating related state into a single value can be useful of course, but only if it you another user already linked to the impl. You can also use it to get access to DOM element, which is a common way to opt-out of react. We use useref hook to reference a DOM node. This is because refs are not part of the component state. I feel like I can answer almost any React best practice questions. Key Features of useRef Oct 29, 2022 · Now I think about this solution below, (using localStorage with useRef()) but I'm suspicious about it, it seems like it isn't technically correct, what do you think about that? It is useRef() supposed to be used for cases like this one, or maybe there are other more convenient solutions? It is supposed to not use any database. I am new to Three. May 6, 2023 · Comparing useRef and useState: While both useRef and useState can store values, they serve different purposes: Managing state: useState is designed for managing state within a component. 8부터 새로 도입된 기능인 Hooks, 그 중에서도 프론트엔드 개발을 하면서 많이 쓰일 useState와 useRef에 대해서 알아보도록 Oct 10, 2023 · useRef と useState は、React の Hooks の中で非常に一般的に使用されるものですが、それぞれ異なる目的と動作特性を持っています。以下に、それぞれの違いを概説します。 useState. This is because useRef doesn't cause a re-render, as opposed to useState which does. Some comparisons (not technical): Question about useState vs useRef I had a component that I wanted to pass on in initial values via a prop, but then wanted to keep these values constant, regardless of changes from the parent. we will learn their basic usage and get to know the different use cases. 4. 4K subscribers in the DevTo community. There is a way. The useRef() is a built-in hook in React that is used for two purposes: . Get the Reddit app Scan this QR code to download the app now. Mar 12, 2021 · React: useState() vs useRef() 1. When it comes to controlling form just use the useForm package. Or check it out in the app stores   useRef vs useState in react youtube Yes useState’s state is queued almost like a menu to carry over to the next render snapshot. useRefは、DOMを参照して要素にアクセスするためのフックになります。 また、DOMの参照に使われることが多いですがReactコンポーネント内の値に対して参照を作成するために使用することも可能 Two commonly used hooks are useState() and useRef(). We also use useRef to create a reference to the email input element, which allows us to focus on it if the form is not valid upon submission Oct 11, 2021 · If we run the above example, we'll see that the 'Component rendered' statement is printed out every time when the button is clicked: There are other use cases also for the useRef hook which you can make use of, however this was just a basic comparison between useState and useRef hooks in React. It's often used for storing ref for html elements. In the case of timers, as they are side effects, they should be started in useEffect hook. 7K subscribers in the DevTo community. Props and state are two items that trigger rerenders, and this is a test question on a lot of interviews. You should use useState if you want the component to re-render when the value changes, you should use useRef otherwise. If you want the entire component to rerender after setting the display prop on the div then use useState. I have heard from my colleagues and coworkers to not use refs to store state values. useRef is immediately changed. But again, If I have to think of the cost of calling the function again and again, should I use useMemo (but in this case, the function is not complex, should we add the memorization overhead)? I want to add, for useMemo i usually use it when i want to combine useState and useEffect at the same time. `useRef` doesn't have this problem in part because the thing that changes Jun 30, 2022 · This means that you can't pass arguments to the useState function to update the state. Turn your state into an object and initialize the names as keys {first:’’, last:’’ , age: ‘’} Then for every input field, add a name attribute respectively Attach the handlechange() in the following way setState([e. Just depends on which drawbacks you're ok with. So when useEffect runs it actually stores the new value in useRef, but the DOM still shows the old value because updating the useRef didn't cause a re-render. useRef can also be used to store resources like timers, request objects etc. With insights from the tldr section, we now can further conclude: useRef(null) is basically useState(React. memo vs useMemo in React. I have never done what I think you want to do without libs (which I am guessing is avoid re-renders when writing in an input), but I'd guess that useRef, which is roughly a useState that doesn't trigger a rerender, could be an answer. Pretty decent video. It is expensive to modify the actual DOM as it will render the whole page while Virtual DOM will change only that component not the whole page. Another important difference is controlled components are controlled by parent components while uncontrolled ones are controlled by DOM. And unlike useState, changes in your useRef "box" does not trigger a new render. input values?) Needs Help With a typical component with a basic input, state is often just handled with a setter function like useState, changing state each time you type a key in the input (and then re-renders). I believed that this would not be a limitation of useRef, but maybe I stand corrected. If you need data changes throughout the component’s lifecycle without triggering unnecessary renders, the useRef is your go-to solution. Good luck trying to replicate hooks like useRef, useEffect and useLayoutEffect with redux lol. This is not a place to solicit design or construction services. The useState hook is the basic building block to manage state for functional components. Oct 6, 2019 · @Tom The general rule is use local vars for derived state. deadsimplechat. useRef‘s current property is mutable, but useState‘s state variable not. Related Topics useRef vs useState in react. But, beware changing a useRef value won't trigger re-renders and useEffect. I think one way of gaining an understanding of useRef is to compare it with useState, so let’s do that. Sep 3, 2020 · useRef is used when you want to track a value that's unique to a component instance but you don't want React to necessarily be notified when it updates. simply reducing the number of useState calls is not a useful goal, it has to be part of some other goal. Nov 15, 2024 · Two commonly used hooks, useState and useRef, often come up in discussions about managing component behavior. Redux / Zustand vs useState performance when handling quickly changing state (e. Subreddit specifically for the professional practice of Architecture. component. useRef 用例： 1. You can then place a reference property on a JSX element to "refer" to that element. Feb 10, 2019 · 1 Replace useRef with useState + createRef. Jun 4, 2024 · In this post, we'll compare the useState and useRef hooks and build some basic intuition around when to choose each one. Is there some benefit to using useRef vs a local variable, especially in case where it's not intended to be shared between multiple instances of the same component. io Open. What is useRef? useRef is another React hook, primarily used for accessing and manipulating DOM elements directly. This subreddit is for anyone who wants to learn JavaScript or help others do so. React useRef hook: useRef value not be used by a useState function. I used an array for my useRef to keep track of the inputs of the newly generated cells. No. current. Allows us to update the state inside components. It works like useState, but accepts different parameters: a callback to recompute state if dependencies change, and an array of dependencies. The title might anger some people. Performance: Since refs don't cause re-renders, they can be more performant for large forms where continuous updates might cause lag. You can see it’s very simple. useMemo is a bit more complicated. map(), [data]) // or for simple state that you're sure you would never modify it directly This! The data persistence across renders is the difference between a var in a component and useRef. The only difference between useRef() and creating a {current: } object yourself is that useRef will give you the same ref object on every render. Connects also, sometimes it is more natural to refer to a "div" using a useRef rather than a useState, and it may or may not be good for your purpose, but you can change refs without triggering rerenders (setters with a useState will trigger a rerender) Using actions vs directly setting values, FP style vs OOP style, describing update logic separately vs inline these all result in the tools being better in some cases, and weaker in others. Using useRef in inside a function handler with hooks. By understanding how they work and how to use them effectively, you Mar 5, 2020 · useRef() gives you something more permanent, like useState() but updating doesn't trigger re-render, very useful if you are doing a lot of manipulation in a chaining fashion, but wouldn't want to trigger a re-render until the end I am trying to create an editable table. (it actually dosen't trigger your app to rerender. The hook useRef allows us to store the previous value of a state. For anything else use useRef (if you don't want rerender) or useState (if you want rerender). Nov 26, 2022 · One of the most frequently used hook is useState(), however on occasion useRef() might be a better and more efficient way to manage state. Basically anywhere i need to step out of react, such as referencing a dom node, using browser api's, fetching data, using local/session storage, these are all things outside of react scope also known as effects hence the name of the hook, useEffect, keep in mind react returns React elements and not pure html elements neither dom nodes hence the reason you need to pass a ref to the jsx element If you want your page to be reactive to the input, use useState. Are you gonna use useRef or useState /controlled or… My understanding is that useState re-renders the component every time the state is updated. That won't work as useEffect runs when a rerender is triggered and useRef does not trigger a rerender. Under the hood it uses useRef to hold the value, and useState to trigger rerender if state changes. You can learn more about that if you're interested. This value is persisted between renders. its used for memoizing variables between rerenders. it’s definitely the best package. For example: const [data, setData] = useState(); const [name, setName] = useState("Mario"); // like the example by ajeet, for complex calculations const formattedData = useMemo(() => data. Lastly, research how this hook is adopted by other devs, maybe in few years no one will use it and it will be pain in the someone’s a** to work with it after you left the company If you do that with useState it will re-render the entire component hundreds of times; if you use useRef it will do no such thing. The value returned by useState() should be treated as immutable and shouldn't be changed without using the state setter, which will of course force a rerender. Jun 21, 2022 · This article explains the React Hooks useState,useRef and useReducer. When you need to store a value that is View community ranking In the Top 1% of largest communities on Reddit. Jul 3, 2021 · Hence, if you use useRef, you do not need to set value={state}, while useState does. While useState() is the go-to choice for managing dynamic state, useRef() serves a different purpose that can be highly beneficial in certain situations. So if you save in this box some value, it will be available in the next render. While they might seem similar at first glance, they serve different purposes. Do you use snippets to generate boilerplate code? There are several great VS Code extensions for React. Using Refs Pros: Immediate Access: Refs provide direct access to a DOM element, allowing you to read and write values without triggering re-renders. If you do not want a rerender you would use useRef I'm aware that this could be very easily solved using useState, however, as I'm still learning, I'd like to clarify the use cases for each hook, and the limitations of each one. Your article does elaborate, which made me feel less queasy, but if the takeaway from a junior dev reading this article is "stop using useState, it's bad perf! useRef instead!", then you've done the rest of us (or at least those that work with said developer or use their apps) a disservice. Given the reasons below: useState use Virtual DOM while useRef creates a reference to the node of an actual DOM. It persists values between renders without causing re-renders. I would suggest reading this article. I hope this post has shed light on the differences between useState and useRef in React development. That's a somewhat intentionally hand-wave-y statement :) For Redux specifically, the tradeoffs are things like: Strengths: Mar 2, 2022 · Another use case of useRef is for the storage that is persisted across component renders. May 28, 2021 · useRef will trigger my function again and again on every re-render while using the callback approach with useState will trigger my function only once. With useRef, it's stored as an object thats key is always "current". 0. …And this previous Stackoverflow question Aug 18, 2023 · Comparative Analysis of useRef and useState: Engaging in a side-by-side analysis of useRef and useState reveals their distinctive roles: State Management: useState: The quintessence of useState is state management within a component. Its hallmark is the triggering of re-renders following state modifications, ensuring a UI congruent with the Get the Reddit app Scan this QR code to download the app now useState vs useRef: Which React Hook to Use When Frontend plainenglish. Imagine a form with 15+ input fields. Following tweet has been enlightening for me: useRef() is basically useState({current: initialValue })[0]. For example, if I store a reference to a DOM element in useRef and I have some outside code also observe the element then I might find that the outside code is "fresher" than useRef. jsx I recognize that your useState here is an array, so it's mutable and you technically could have it change shape (though not really value) even when const, but thankfully useState doesn't know the difference between a string and an array, and never mutates the value you pass to it - instead, what happens is that every call to useState buffers a Oct 1, 2024 · Two fundamental hooks, useState and useRef, are often used in conjunction to achieve different functionalities. May 24, 2021 · Learn the similarities and differences between the useState and useRef Hooks in React, as illustrated demos and use cases. current would be null until the component updated for some other reason, like a prop or state change). Since `useState` returns a brand new object/value by convention whenever that piece of state is changed, closure rules screw you up when you try to reference that piece of state from inside an anonymous function that was declared with a different value for that variable. It also explains how you can mimic useCallback with useRef. name]: e. Posted by u/tvhieu - 3 votes and 4 comments Sep 6, 2023 · When initializing useRef, the hook is called differently in both appearance and functionality than useState, which is stored as an array with a variable and setter function. if you turn all your state into into a big object, you still have the same number of state values conceptually, even if you only have one useState. A common use case is handling a form input field when the submit button is clicked. with onChange event) you have to use useState, if you only want to get the value on submission of the form, you are free to use useRef. So wouldn't every keystroke re-render the Form? import { useRef } from 'react' const Form = ({ addTodo }) => { const todoRef = useRef() const handleSubmit = => { const todo = todoRef. Instead, you must call the function that is returned by useState. You might need to use the second approach with the if, since otherwise the component won't update to reflect the initialized ref value (calculatedConstant. Redux could replace three hooks: useState,useReducer and useContext, thats it (and even when using redux these hooks have their uses). Memo def has its pros but I would use them only if I’m comfortable with it. if you don't need anything else to happen other than the display prop updating, then useRef is your solution. The third difference is that the useState hook is designed to be used with functional components, while the useRef hook can be used with either functional or class-based components. target. Because of this I have no clue what they do or why they’d be useful. The former is toggled once, and it triggers updating the 2nd using requestAnimationFrame, for example. The main reason to use it would be to keep track of a DOM element or to keep track of the previous props for comparisons sake. The hook returns a tuple where the first element is the state and the useState is similar, but updating the value store in useState will make the component render and update the UI. They often opt to use useState instead when perhaps it’s not the right choice. It well, i don't much, but useRef is exactly like useState but when it changes, UI does not rerender. What is useState? Jan 2, 2024 · Here are some examples of when to use useRef() instead of useState(): When you need to store a value that does not trigger a re-render when it is updated. Even though it gives us a simple thing as a simple object, it keeps the same refs through every render phase. In this article, we’ll explore the scenarios where you should consider using useRef() over useState() and provide relevant code examples. If there’s a reason to do it the way u/gaearon suggested, then I don’t understand. Avoid adding additional complexity to codebase if that is not necessary (dont optimise just to optimise). g. This way the component won't be unnecessarily rerendered. The common between them is, both useState and useRef can remember their data after re-renders. I wanted to try to use the useRef hook in this case but I don't object to using useState if that's better suited. Apr 16, 2024 · 重新渲染行为：更新 useState 返回的值会导致组件重新渲染，同时更新使用 useRef 的 current 属性 不会触发重新渲染。 用例： 为了进一步了解 useRef 和 useState 的用例，让我们探讨一下每个钩子更适合的一些场景： 1. Note: All spam and self-promotion, or anything remotely close to it, will be removed and those that post will be banned. In my experience, both useRef and useState can be stale. Share Add a Comment I digged into deep React concepts and fully understand useRef vs useState (for example). I’ve been wrong about many things before, and am willing to be correcting by someone who would definitely know better. useState VS useRef. js. jdc wfd iawsmkq nmwdvtx zrzxav tdabc xgj rptuv nqtpbkbd ouwsx