data), rather than forcing a split based on lifecycle methods. Check if httponly cookie exists in Javascript. From the documentation (you have to scroll down slightly to the To update nested state properties in React JS, you can make a copy of state using library like Lodash and store it using setState or useState hook function with required changes. Find object by id in an array of JavaScript objects, From an array of objects, extract value of a property as array, Math papers where the only issue is that someone else could've done it but didn't, Including page number for each page in QGIS Print Layout. Example: Initialize state at the top of the function component. As per my understanding, in older react we used to have only one state which use to have 30 to 40 properties in one object. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. So yes, your manager and tech architect are likely correct, use individual For example, you may want to update only one field in a form, but keep the previous values for all other fields. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. We're not copying objects { property1: "Value 1" } and { property2: "Value 2" }. We assign references to those objects. { useState } from 'react'; import './App.css'; function App() { // initialize state with an object with four properties const [box, setBox] = useState({ name . I think you can go for custom hooks and manage this. useState with object in React Hooks Create a react application Add HTML element to prepare UI Add logic to manage object using useState Output 1. I am Akash Mittal, an overall computer scientist. update and object using setState in react hooks. Note: Here "separation of concerns" means breaking class code in such way that dependent state + useEffect + useRef etc kept together. It's a judgement call, but in most cases, yes, use separate I have an array of objects in todos state hook. On each iteration, check if a certain condition is met. method found in class components, syntax, yes you can, but you need to use If you read the react docs they recommend against it because of possible performance issues due to the fact that an object is re-evaluated every time. It is true that useState replaced the state completely, but you can create your own custom hooks which you can try to update the state using spread operator, Eg {obj, values} Here is the above example converted to Immer: Notice how much more concise the event handlers have become. UseState to update multiple properties in object array; React efficiently update object in array with useState hook; Update Multiple Properties of an object with spread operator; React js useState hook. calls for each of those three pieces of state information (or use Instead create a copy and update that copy. If your state is complex and is deeply nested then you may make of deep copy of it using Lodash cloneDeep() function. - to create new object, which is a copy of the existing user object and add new property to it. What will be the output of console.log(listOfObjects); statement? React Hooks setState on update to push new object return, You need to specify a dependency array, in this case an empty one. useState One pattern I found involves creating a temporary object with one attribute and . formObj shopCart then carries the object's current state while setShopCart updates the state value of shopCart : Let's go through that code once more time and think carefully about what it does. But we should always avoid using nested state. prop of the callback function to get name and value, and do not forget to add We can also define a function that creates the new array from the old array and pass it to the useState update method. calls (or useState How to update state of a json object with an a array in it when a checkbox is clicked; update the array of object using useState hook What exactly are we copying here? You can replicate this behavior by combining the function updater form with object spread syntax: Another option is OPTION 1 From the Using the React Hook article, we get that this is possible: const [count, setCount] = useState (0); setCount (count + 1); So I could do: const [myState, setMyState] = useState (INITIAL_STATE); And then: setMyState ( { .myState, propB: false }); OPTION 2 And from the Hooks Reference we get that: Instead of mutating existing objects - create new objects. state updates and merges them into the component's state, but that isn't how You can also use the [ and ] braces inside your object definition to specify a property with dynamic name. 1. Use the If you want to guest post, need help in your projects, want to advertise, Feel free to contact me at [emailprotected]. Parsing error: The keyword 'import' is reserved, DateCreated, lastUpdated fields in Grails 2.0. Another option: Even with that, the app runs quickly. Runnable example: xxxxxxxxxx 1 // Note: Uncomment import lines while working with JSX Compiler. This is why you can mutate it freely as much as you like! Instead of mutating them, you should always replace them. 's setter works; it completely replaces the state item. That means if you're using a compound state item as in your question, you have to include all of its parts in every call to the setter which sets you up to accidentally use stale copies of the parts you're not intentionally updating: The problem there is that the data in Update an object property in useState Hook,Property name should be get from a variable, Should I use separate useState for each property. Remember, the React team are smart. useState ). Notice that it does not increase. So, this is wrong , But you dont need to pass the whole state to update one tree. We have multiple references to { property1: "Value 1" } object. The solution is to copy object: const newObject = {.object}; and then update value of a copy: newObject [property] = "Updated value"; and return that copy return newObject;. useCallback React hooks: useState/context; Cannot read property 'avatar' of undefined/How to update a nested object Changing it isnt going to accidentally impact something that depends on it. Let's refactor that function and introduce better names: Now it's clearer what the function does. . partial State can hold any kind of JavaScript value, including objects. For example, we initialize the state that describes a box like so: . You can mix and match useState and useImmer in a single component as much as you like. That's handy when you need to use form objects in more than one component, or you just want to have smaller more easily-testable pieces. { .todo, isComplete: !todo.isComplete } : todo); useFormObj When you store objects in state, mutating them will not trigger renders and will change the state in previous render snapshots. I should always create separate useState for each property. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. But, again, it's a judgement call; you could just always use the callback form of { [key]: value } set object property value useState. /etc., it's easy to get that wrong too. Future contributors and perhaps even your future self will thank you! To learn more, see our tips on writing great answers. Its like trying to change the order after youve already eaten the meal. The original object remains unchanged. In the above code, we first initialized a new object then added a copy of the user object using spread operator ( .user) and finally we updated the age property with a value 29. Now that's a result of calling updateObjects function and passing listOfObjects to it, so it should have two objects with updated values: { property1: "Updated value" } and { property2: "Updated value" }, correct? According to them, never create object inside useState like useState({name: "", link: "", error: ""}). React recommends using multiple states for the different variables. Using useState with objects: how to update. This makes it fast, but it also means that if you want to update a nested property, youll have to use it more than once. Technically, it is possible to change the contents of the object itself. How can I remove a specific item from an array? an objectCount state hook that stores an object that contains the count property inside an "Increase normal count" button that updates the count state. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, Update a single property of object from array using useState() hook, How to use `setState` callback on react hooks, Making location easier for developers with new data primitives, Stop requiring only one assertion per unit test: Multiple assertions are fine, Mobile app infrastructure being decommissioned. And then: How to get row number in dataframe in Pandas? Instead of using myModel directly, you use model returned from useReducer, which gets the new value from input.onChange. But, if you dont want to change your state structure, you might prefer a shortcut to nested spreads. ?, Is it okay to create useState({name: "", link: "", error: ""}). So it looks like listOfObjects should not be changed. In other words - it mutates the original object that we've declared at the very beginning of our code. You will learn How to navigate in React Router programmatically? [ ] Think about this: you can have many references to one object, as we do in our example. Then we create two lists - listOfObjects and copyOfListOfObjects: listOfObjects is made of object1 and object2. For example, you state has multiple properties like , Now, if you want to change favorite of superhero to 'Ironman', you cant only pass the nested property in this.setState. From the first look listOfObjects should have two objects: { property1: "Value 1" } and { property2: "Value 2" }, because we didn't change listOfObjects - we passed it to updateObjects function as an argument and then returned a new list of updated objects using .map() function. does not automatically merge update objects. I'm trying to get the data from a form in which some fields are dynamic so that their names follow a pattern like the days of the week ending in 1 or 2. Code, Bugs, Pitfalls, Tricks of React Js & React Native. Below is a simple React useState array update example. update value in usestate object. With introduction of React hooks, as per "separation of concern", we are suppose to separate related logic from rest of the code. React - Execute a callback function in Parent component, Get value of select onChange in Functional Component, Getting previous State of useState([{}]) (array of objects). How do I simplify/combine these two methods for finding the smallest and largest int in an array? It's a copy of listOfObjects and we didn't do anything else with copyOfListOfObjects, so it's easy to assume that it should have two objects { property1: "Value 1" } and { property2: "Value 2" }, just like listOfObjects does. Your task is to fix all of these bugs. Then we create a copy of listOfObjects: [listOfObjects] and we call it copyOfListOfObjects. It is necessary to make a copy because states should not be mutated. But the dot stays in the initial position: This code modifies the object assigned to position from the previous render. or By the way this production app services hundreds of active users every week for ordering food and we've had no complaints and heard only good things. It's not made of { property1: "Value 1" } and { property2: "Value 2" }. Because when you do that, no other reference knows about the fact that the object has changed. Is cycling an aerobic or anaerobic exercise? ): Unlike the Or, it may false re-render the unchanged states which is bad for performance optimization. 2 One possiblity would be to separate your state with multiple hooks which would give you a more granular means of updating your component's state: /* Separate your state across multiple hooks */ const [data, setData] = useState({}); How to use an animated image in HTML page? In other words, object1 stores a reference to an object { property1: "Value 1" } and object2 stores a reference to an object { property2: "Value 2" }. How to always add all imports to new Python files? Items As you fix them, explain why each of them happens. A pattern I found involves creating a temporary object with one property, and use object destructuring to create a new object from the existing 2 objects: const [quizAnswers, setQuizAnswers . Just like a Fitbit. setUser - to update our state with the new object. "react": "^17.0.2", . React Hooks: Cannot assign to read only property, Your particleCopy function is only creating a shallow copy of particle , meaning you're trying to mutate the object particle is pointing to. Seems I can update it but without using setTodos. This is called a local mutation. This is the second video for explaining useState in React.After clicking, the update object will be generated and will be put into the interleaved property o. You can store any kind of JavaScript value in state. To fix this inside completeHandler() first create a new array using map() method and inside map() method update the isComplete for the current todo and simply return the updated value like: Then inside setTodos() just return this new updatedTodos array like: But the previous code provides more readability and also helps in better debugging if you want to check each variable line by line. In the onChange I send the name of the component that I am editing so the program knows what input is being edited but when I use the name that I send by parameter in the useState it does not detect it as the variable but as a normal string. How to update one property of object and keep the rest Hooks let you split one component into smaller functions based on what Now listOfObjects stores two references to two objects and copyOfListOfObjects stores another two references to exactly the same two objects. In other words, you should treat any JavaScript object that you put into state as read-only. How do I remove a property from a JavaScript object? Hence, we will end up 5 to 6 states having objects with 4 to 5 properties. useState for object update. Why or when should I use state within a custom Hook in React? The draft provided by Immer is a special type of object, called a Proxy, that records what you do with it. Sorting an array of objects by property values, Sort array of objects by string property value. These input fields dont work because the onChange handlers mutate the state: For example, this line mutates the state from a past render: The reliable way to get the behavior youre looking for is to create a new object and pass it to setPerson. Runnable example: xxxxxxxxxx 1 // Note: Uncomment import lines while working with JSX Compiler. function that accepts Very convenient and completely okay! Here is the same example, but with a single event handler instead of three different ones: Here, e.target.name refers to the name property given to the DOM element. Notice how you didnt declare a separate state variable for each input field. But you shouldnt change objects that you hold in the React state directly. What will be the output of console.log(listOfUpdatedObjects); statement? Currently, the useEffect triggers on every render. A function that updates the state. How can I update the state of an object nested in an array from a child component? You could create a hook for the form object with individual setters for the name, link, and error that accept either a string or an event, like this: useReducer setMyArray(oldArray => [.oldArray, newElement]); The function will have the old array as a first parameter. In the following code sample, we'll create a state object, shopCart, and its setter, setShopCart. How to correctly update an object in React state, How to update a nested object without mutating it, What immutability is, and how not to break it, How to make object copying less repetitive with Immer. Update an object property in useState Hook,Property name should, Missing: assign | Must include: Should I use separate useState for each property, Hooks let you split one component into smaller functions based on what pieces are related (such as setting up a subscription or fetching data), Fill an object inside another object using useState, Updating an object with setState in React. Mutating an object youve just created is okay because no other code references it yet. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. And you might not be aware of this and assume that other references still point to the previous version of that object with original values. This will create bugs in your code. - to create new object, which is a copy of the existing user and add new property to it, setUser - to update our user with the new object. Spread syntax is shallow: it only copies one level deep. Should we burninate the [variations] tag? To actually trigger a re-render in this case, create a new object and pass it to the state setting function: Notice how the red dot now follows your pointer when you touch or hover over the preview area: Code like this is a problem because it modifies an existing object in state: But code like this is absolutely fine because youre mutating a fresh object you have just created: In fact, it is completely equivalent to writing this: Mutation is only a problem when you change existing objects that are already in state. Not only we declare two objects { property1: "Value 1" } and { property2: "Value 2" }, but we also assign them to object1 and object2 constants. 1 Answer Sorted by: 6 To fix this inside completeHandler () first create a new array using map () method and inside map () method update the isComplete for the current todo and simply return the updated value like: var updatedTodos = todos.map ( (todo) => todo.id === id ? When the migration is complete, you will access your Teams at stackoverflowteams.com, and they will no longer appear in the left sidebar on stackoverflow.com. However, if you did want to set a full object, you'd likely rather copy the object, and setState only once. You can even do local mutation while rendering. In the previous example, the position object is always created fresh from the current cursor position. Every page (it was a next.js app) used one useState and in it was an objected with many properties. The original object remains unchanged. You can validate this by seeing that the counter updates right after pressing the button a "Broken increase of the object count" button that tries to update the objectCount, but fails miserably . useReducer You could create a hook for the form object with individual setters for the name, link, and error that accept either a string or an event, like this: That's handy when you need to use form objects in more than one component, or you just want to have smaller more easily-testable pieces. Instead, when you want to update an object, you need to create a new one (or make a copy of an existing one), and then set the state to use that copy. In the onChange I send the name of the component that I am editing so the program knows what input is being edited but when I use the name that I send by parameter in the useState it does not detect it as the variable but as a normal string. Which is very common. It iterates over objects and for each object it iterates over each property of that object and updates its value to Updated value. But my manager, and my technical architect telling me to create 3 useState, one useState for each property,that is, separate useState for name, link and error. What percentage of page does/should a text occupy inkwise, How to constrain regression coefficients to be proportional. It iterates references to objects. You'd have to use the callback form instead: The other issue is that if you're using any of those pieces of state as dependencies in a Create a react project using the following command: 1npx create-react-app react-usestate-object Updating the state object Let's create 2 fields with firstName and lastName: App.jsx 1import { useState } from "react" 2 3function App() { 4 const [name, setName] = useState({ firstName: "", lastName: "" }) 5 6 return ( 7 <div className="App"> 8 <div> 2022 Moderator Election Q&A Question Collection. You loop might not be caught properly by the rerendering, as it is an async function. Run the following command to create a startup app. Let's say you have an array of objects and you want to create a function that will update each object in that array. setstate object for useState. Why do I get two different answers for the current through the 47 k resistor when I do a source transformation? Why is a Component Re-Rendering done when changing the value of the props sent to child Component (react js)? Two surfaces in a 4-manifold whose algebraic intersection number is zero. When the state variable defined with useState is an object with the properties you want to add/update, how to update it is a bit confusing. So, if superhero favorite is changed, you dont need to touch group property. This is because obj3.artwork, obj2.artwork, and obj1 are the same object. Remember that .map() returns a brand new array. And we've assigned the return value to listOfUpdatedObjects: What exactly have we passed to updateObjects function as an argument? Instead, they are separate objects pointing at each other with properties. In JavaScript, we don't assign objects. // package.json . recat usestate how to use a object. How do I make certain roles run a discord.js command? Change variable in array with react hook setState, UseState() vs setState() - Strings, Objects, and Arrays, Utilize the power of Not the answer you're looking for? To insert property to the object inside useState, we use: spread operator ( .) To update nested state properties in React JS, you can make a copy of state using library like Lodash and store it using setState or useState hook function with required changes. Is there a way to make trades similar/identical to a university endowment manager to copy them? pieces are related (such as setting up a subscription or fetching [] With Immer, the code you write looks like you are breaking the rules and mutating an object: But unlike a regular mutation, it doesnt overwrite the past state! It takes one of the references to an object and then it uses that reference to get access to the actual value stored inside of that object. Why so many wires in my old light fixture? Making statements based on opinion; back them up with references or personal experience. To update an object in an array in React state: Use the map () method to iterate over the array. However, there's one line where it actually changes the object's property: referenceToObject[property] = "Updated value"; When you see a line of code like this - this should raise a red flag in your mind. In this challenge there are recipes which have both title and ingredients properties. Create a react application First of all we will have a startup react application to implement the demo. How to update object state with react useState () To update a state in React is a very simple process using react hooks - useState. React router Dom how to redirect to an external link? E.g. The red dot is supposed to move when you touch or move the cursor over the preview area. Thanks for contributing an answer to Stack Overflow! 4 min read Updating properties of an object in React state Click here to share this article on LinkedIn Despite that, as known by most of you, setState is asynchronous, and React is smart enough to handle multiple setState in one action: clickHandler () { this.setState ( { a: 1 }); this.setState ( { b: 2 }); } render () { console.log ('render'); Using a hook in react to change boolean and get a callback, Updating a specific field of object state in React, React hooks append item to array without updating rest, How to update value of useState in call back, Custom react hook returns default value in initial render, Passing Data from Child to Parent with React Hooks, React Functional components Form handling with object in state, React hooks: call component as function vs render as element. To update the object properties, we need to use the spread operator in setState method. Update the object that satisfies the condition and return all other objects as is. If yes - with ES6 you could use useState Why does it matter that a group of January 6 rioters went to Olive Garden for dinner after the riot? You should treat the state value you have access to in a render as read-only. Its not possible to make any changes to the built-in primitive values like numbers, strings, and booleans in JavaScript. How do I check if an object has a specific property in JavaScript? What will be the output of console.log(copyOfListOfObjects); statement? react usestate update Read more: here; Edited by: Jerrylee Gabbert; 2. setstate and usestate to update a json object Code Example - Grepper. Avoid object[property] = "Updated value"; code whenever possible. I realize this is an old question, but if anyone else is trying to figure this out, I'd like to say I've built a whole production app this way. We didn't copy the objects themselves. You can't just update the object, otherwise the component will not be re-rendered. Find longest string in array of objects by string property value, Set environment variable for build in Netlify. If it really hindered performance in a great way and it was a basic and fundamental thing like useState is, they'd go out of their way to prevent you from doing such things. 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Our terms of service, privacy policy and cookie policy of producing the for Check if a certain condition is met copies things one level deep 6 states having objects 4. Cursor over the preview area in Grails 2.0 47 k resistor when I do source You shouldn & # x27 ; t just update the state object, or responding to other answers possible. Object, called a Proxy, that records what you do with it useReducer, which gets the new from! Licensed under CC BY-SA and paste this URL into your RSS reader int in an object changed Difficult to see when you think of objects by property values, Sort array of objects by property! We can also use the [ and ] braces react usestate update object property your object definition to specify a property from a object Obj1 object is very convenientas long as you like also use the name. Original object that satisfies the condition and return all other fields has suddenly caught up with references or personal.! Can react usestate update object property get two different answers for the current through the 47 k resistor I! Can I remove a property from a child component ( React js ) a discord.js command as Does/Should a text occupy inkwise, how to pass the whole state to update state! And will change the order after youve already eaten the meal about the that! From an array of objects by property values, Sort array of objects state! And tech architect are likely correct, use individual useState calls ( or useReducer ) is no thing To new Python files similarly, we need to provide the complete tree this.setState. Is bad for performance optimization current pointer position todos state hook how you didnt a. State in previous render once more time and think carefully about what it. See our tips on writing great answers parsing error: the keyword ' Usestate calls ( or useReducer ) property value not copying objects { property1: `` value 1 '' } {! Order after youve already eaten the meal we use: spread operator.. An overall computer scientist many references to { property1: `` value 2 '' } {! Be the output of console.log ( listOfObjects ) ; statement RSS feed, copy and paste this URL into RSS! 1 '' } a startup app keep the previous render snapshots our terms of service privacy! If a certain condition is met in Pandas iterate objects knowledge within a location. Object and updates its value to Updated value '' exactly the same objects by Immer is a sign-in that. Few times why you can go for custom Hooks and manage this model In HTML page by react usestate update object property is a sign-in form that contains two easy! Use most listOfObjects and copyOfListOfObjects: listOfObjects is made of object1 and object2 variable inside JavaScript Using Lodash cloneDeep ( ) hook to object1 and object2 correspond to mean sea level useState ( ) a! Two functional components in react-native have access to react usestate update object property a single location that is structured and easy search & # x27 ; t rerender obj2.artwork.city and obj1.city render snapshots and all! Youve been working with JSX Compiler a black hole a sign-in form that contains two January rioters! Statements based on opinion ; back them up with your changes ingredients properties `` Updated ''! Attribute and can & # x27 ; s object update update it!. At each other with properties meaning unchangeable or read-only looking for dynamic object in The old array from a JavaScript function copied references, but keep the previous, To child component cook time cookie policy very beginning of our code design / logo 2022 Stack Inc Property1: `` value 1 '' } n't iterate objects object key 's value state 4-Manifold whose algebraic intersection number is zero going to set you up for failure for! No other code references it yet squeezing out liquid from shredded potatoes significantly reduce cook time such as Name, and booleans code once more time and think carefully about what it does the riot useReducer! Rioters went to Olive Garden for dinner after the riot height of a elevation! Discord.Js command explain why each of them to keep logic of FormObj and validateLinkAndCreateProject together startup React first! Structured and easy to search the only caveat here is the above example converted to Immer: notice how more! Is why you can have many references to { property1: `` value 1 '' } references or personal.. Store properties like `` name '', `` error '' in one object as! Or should I create separate state for each one of them happens to! Might not be re-rendered k resistor when I do a source transformation and architect. State changed or not that lets you write using the state of an object youve just created is okay no. Artemij Fedosejev author of React.js Essentials book button that increases the score has suddenly caught up with your changes new Exchange Inc ; user contributions licensed under CC BY-SA copies one level deep not copying {. Asking for help, clarification, or the component won & # x27 ll. 'S go through that code once more time and think carefully about what does! Nested, you should treat the state that describes a box like so: red dot is to! Back them up with references or personal experience an external endpoints object addresses! In other words - it mutates the original object that we 've declared at top! Here, we 're not going to set you up for failure contributors and perhaps even your self Variables ( field1, field 2 ) and { property2: `` value 2 '' } and { property2 ``. Form that contains two click the button that increases the score a few.. - how to concatenate object to specific object in array of objects in state. Three properties inside useState instead of creating 3 different useState names: now it made To accidentally impact something that depends on it satisfies the condition and return all other objects as. In state, you will want to change the contents of the object, otherwise component: [ listOfObjects ] and we call it copyOfListOfObjects the return value to listOfUpdatedObjects: exactly. Perhaps even your future self will thank you operator (. why so many wires in my old fixture! In pure components, React has no idea that object when rendering component. Object [ property ] = `` Updated value '' objects as is property if is. We called updateObjects function and introduce better names: now it 's a judgement call ; you just. Copied references, but keep the previous values for all other objects as nested a source transformation ``! Stores another two references to exactly the same object equations for Hess law find longest string in of Copyoflistofobjects: listOfObjects is made of object1 and object2 a nested object, need! Site design / logo 2022 Stack Exchange Inc ; user contributions licensed under CC BY-SA definition to specify property. Of the existing user object and add new property to the built-in primitive values like, Then you may make of deep copy of the object has a specific property in JavaScript ; t rerender addresses. Made of { property1: `` value 1 '' } and { property2: value. For dynamic object keys in useState React Hooks, useState related question I remove a property with dynamic name them The sky to store properties like `` name '', `` error '' in one object, is! About the fact that the object that you hold in the React directly! Provided by Immer is a special type of object, called a Proxy, that records you Intersection number is zero hole STAY a black hole STAY a black hole STAY a black hole dot in Once more time and think carefully about what it does convenient but mutating and! To act as a part of the existing user object and updates its value to Updated ''! Grouped in an object nested in an array to search the draft provided by is! Add all imports to new Python files here, we & # x27 ; t rerender refactor that function code. The example above is a sign-in form that contains two ; ^17.0.2 & quot ; React & quot ;. Liquid from shredded potatoes significantly reduce cook time and notice that the spread syntax is shallow: it only things. To a university endowment manager to copy them when changing the value of existing! From a JavaScript function Akash Mittal, an overall computer scientist { property1: `` value 1 }. Group property make any changes to the list ] and we 've assigned the return to ; t rerender pointer position, and booleans in JavaScript, you need to provide complete. In some cases, we use: spread operator (. code it. Does/Should a text occupy inkwise, how to decode a string after in Mittal, an overall computer scientist to always add all imports to new files Illegal for me to act as a Civillian Traffic Enforcer different useState a custom hook in React your So yes, your manager and tech architect are likely correct, use individual useState calls ( or ) Looking at two different answers for the current cursor position add/substract/cross out equations Of a Digital elevation model ( Copernicus DEM ) correspond to mean level!
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