{ const newTodos = todos . Did you want a JSX fragment <>...? Since the setState() may work asynchronously in manu cases for performance reasons. Syntax of Spread operator is same as Rest parameter but it works completely opposite of it. Redux: Generating Containers with connect() from React Redux (VisibleTodoList) 5m 13s. Example: JSX Spread Attributes If you know all the properties that you want to place on a component ahead of time, it is easy to use JSX: var component = < Component foo = { x } bar = { y } /> ; This will make things like debugging harder. Es6 spread operator (…) In es6, we have a spread operator(…) which helps us to create a duplicate copy of an array. To fix, cancel all subscriptions and asynchronous tasks in a useEffect cleanup function. Both operators have many use cases and are used nowadays by most JavaScript developers to achieve the old JS tricks without getting things complex. With rest parameters we were able to get a list of arguments into an array. Can't perform a React state update on an unmounted component. This is likely because you're using an outdated version of create-react-app. Rest syntax (parameters) Rest syntax looks exactly like spread syntax. But modifying them using setState () is not the same as updating normal state variables. It's a common task in React to remove an item from a list. Redux: Generating Containers with connect() from React Redux (AddTodo) 4m 41s. The spread operator allows us to expand elements. This is a clean syntax but in some cases it may be considered an anti-pattern which means you need to avoid using it. Spread operators. “react spread operator state array push usestate” Code Answer . React Key Concept. Warning: Can't perform a React state update on an unmounted component. list . Showing Array Values in Text Component one by one like ListView. The Spread operator lets you expand an iterable like a string, object or array into its elements while the Rest operator does the inverse by reducing a set of elemnts into one array. The dependency array is the second optional argument in the useEffect function. because spread syntax only creates a shallow copy of the array or object. Adding onPress-onClick method on Array Item to get its value on click event. Please use Settings.setAppElement(el), react router not working with aws amplify, react how to block render if data is not fetched yet, Autocomplete an Address with a React hook Form, props is send undefind to functional component in react js, react open on different url instead of localhost, How to Submit Forms and Save Data with React.js, how to add multiple style attributes in react element, react enzyme simulate click sub component, How to make a buttom in react stackoverflow, reactjs facebook login popup trigger on load page, how to get checked row data using react table in react js, how to enable sign-in provider in firebase console, paypal subscription based payout api reactjs, React Hook "useState" is called in function which is neither a React function component or a custom React Hook functio, this.setState is undefined inside a async function in js, set meterial icon color change onClick react, how to pass property component in react enzyme, how to return the number of nodes in a linked list, start to work with a pre existing react projects, how to make item not dragable in react-sortablejs, pass props in another component in enzyme, React looping hooks to display in other hook, how to turn of autocomplete in react hook form material ui, how to make sticky footer with react router, why does my react project dosent have any class, how to get code suggestions for react components, mock api inside react component jest async, remove state from location on page load in react router dom, react mid senior dev interview questuions, route with parameter react not working not found, testing a function in jest on click react, react select remove the loading indicator, how to store multiple date from date form field in reactjs, react history listen get previous location, how to get state value from history react, get selected value on componentdidmount reactjs, [React Intl] Missing message for locale: "en", make forn awesome icon clickable in react, How to test useEffect in react testing library, how to pass state from parent to child in react, get syntethicbaseevent and parameter in react, Rendered more hooks than during the previous rende, advanced axios in react js using create and interceptor, convert datetime value to time only in reactjs, how to save data on database in react form, error build react Failed to execute 'replaceState' on 'History': A history state object with URL 'file:///' cannot be created in a document with origin 'null' and URL, creating a new array of objects from existing array of objects lodash. true or false, how to call a function in react with arguments onclick, React Hook "useState" is called in function "app" which is neither a React function component or a custom React Hook function react-hooks/rules-of-hooks, decet wheter react app in development or production, how to load the images from the website dynamically in react. 2 minutes read The ES6 Spread Operator can be used for arrays and objects. When you use the ...props syntax, you actaully expand the props object from the parent component, which means all its attributes are passed down the child component that may not need them all. Example: Lets first look at an example: I personally rely on this deep copy strategy. This is a no-op, but it indicates a memory leak in your application. In a simple test with an array that has 100 ints, slice reported 4,420,016 ops/sec while using spread operator reported 219,263 ops/sec. A template was not provided. whatever by Disgusted Dolphin on Jun 02 2020 Donate . The delete button exists on the component. Es6 spread operator (…) We can use the es6 spread operator us to convert an array into an object. Array Spread Operator We define iterables as: strings, arrays, sets.Basically if you can loop over, then your property can be an iterable. Adjacent JSX elements must be wrapped in an enclosing tag. Both operators have many use cases and are used nowadays by most JavaScript developers to achieve the old JS tricks without getting things complex. The object spread operator is conceptually similar to the ES6 array spread operator. spread operators however, let us unpack elements in an array to single/individual arguments. setState() React State: Add item to array. Creating an Array State with useState () First, let's see how to use the useState () hook for creating an array state variable. It is mostly used in the variable array where there is more than 1 values are expected. react can only work with node and express? (See end of answer for how to fix it - create the new obj no matter what, then either push it to the new array, or replace the existing object in the array, without mutating the existing object in the array) Let's see how it works as alternative to the array … While it could be tempting to push to the array or do something like this.state.shareholders[idx].name = newName, this is not a sound approach. In fact, since most React developers make use of build systems and transpilers such as Babel to support latest JS features, you can safely use the dots syntax in your React code. The rest operator condenses elements. Spread syntax effectively goes one level deep while copying an array. For example, state updates may be asynchronous: React sometimes batches multiple setState() calls for performance reasons. Using Slice react dictionary key value avec 2 variable, how to scroll to an element javascript react, this.setstate is not a function in react native, scrollbar automatically scroll down as new divs are added reactjs, change the value in checkbox by button react, React best way of forcing component to update, react create pillbox for each chunk of array, react yup password with number string and uppercase, you should not use switch outside a router react, vscode react cannot find moudle when import image, Module not found: Can't resolve 'jquery' in react, how to add alternate image in img tag in react, how to send axios delete to the backend reactjs, react bootstrap make col disapear in small screens, react warning can't perform a react state update on an unmounted component, module not found: can't resolve 'react' in 'c:\users\pavlos\desktop\reactjs\hwr\reactproject2\src', render object id in an array reactjs from database, Setting a background Image With React Inline Styles, jest Invariant Violation: could not find react-redux context value; please ensure the component is wrapped in a . Make sure to set state correctly and to use the latest state. (The same is true with Object.assign() and spread syntax.) The initial data object contains an array rows, which itself contains an array for every single row. In this tutorial, we are going to learn about three different ways to convert an array into an object in JavaScript. spread operator does not do a deep copy if I am correct and will lead to state mutations with NESTED objects in React.. 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" /> { const newTodos = todos . Did you want a JSX fragment <>...? Since the setState() may work asynchronously in manu cases for performance reasons. Syntax of Spread operator is same as Rest parameter but it works completely opposite of it. Redux: Generating Containers with connect() from React Redux (VisibleTodoList) 5m 13s. Example: JSX Spread Attributes If you know all the properties that you want to place on a component ahead of time, it is easy to use JSX: var component = < Component foo = { x } bar = { y } /> ; This will make things like debugging harder. Es6 spread operator (…) In es6, we have a spread operator(…) which helps us to create a duplicate copy of an array. To fix, cancel all subscriptions and asynchronous tasks in a useEffect cleanup function. Both operators have many use cases and are used nowadays by most JavaScript developers to achieve the old JS tricks without getting things complex. With rest parameters we were able to get a list of arguments into an array. Can't perform a React state update on an unmounted component. This is likely because you're using an outdated version of create-react-app. Rest syntax (parameters) Rest syntax looks exactly like spread syntax. But modifying them using setState () is not the same as updating normal state variables. It's a common task in React to remove an item from a list. Redux: Generating Containers with connect() from React Redux (AddTodo) 4m 41s. The spread operator allows us to expand elements. This is a clean syntax but in some cases it may be considered an anti-pattern which means you need to avoid using it. Spread operators. “react spread operator state array push usestate” Code Answer . React Key Concept. Warning: Can't perform a React state update on an unmounted component. list . Showing Array Values in Text Component one by one like ListView. The Spread operator lets you expand an iterable like a string, object or array into its elements while the Rest operator does the inverse by reducing a set of elemnts into one array. The dependency array is the second optional argument in the useEffect function. because spread syntax only creates a shallow copy of the array or object. Adding onPress-onClick method on Array Item to get its value on click event. Please use Settings.setAppElement(el), react router not working with aws amplify, react how to block render if data is not fetched yet, Autocomplete an Address with a React hook Form, props is send undefind to functional component in react js, react open on different url instead of localhost, How to Submit Forms and Save Data with React.js, how to add multiple style attributes in react element, react enzyme simulate click sub component, How to make a buttom in react stackoverflow, reactjs facebook login popup trigger on load page, how to get checked row data using react table in react js, how to enable sign-in provider in firebase console, paypal subscription based payout api reactjs, React Hook "useState" is called in function which is neither a React function component or a custom React Hook functio, this.setState is undefined inside a async function in js, set meterial icon color change onClick react, how to pass property component in react enzyme, how to return the number of nodes in a linked list, start to work with a pre existing react projects, how to make item not dragable in react-sortablejs, pass props in another component in enzyme, React looping hooks to display in other hook, how to turn of autocomplete in react hook form material ui, how to make sticky footer with react router, why does my react project dosent have any class, how to get code suggestions for react components, mock api inside react component jest async, remove state from location on page load in react router dom, react mid senior dev interview questuions, route with parameter react not working not found, testing a function in jest on click react, react select remove the loading indicator, how to store multiple date from date form field in reactjs, react history listen get previous location, how to get state value from history react, get selected value on componentdidmount reactjs, [React Intl] Missing message for locale: "en", make forn awesome icon clickable in react, How to test useEffect in react testing library, how to pass state from parent to child in react, get syntethicbaseevent and parameter in react, Rendered more hooks than during the previous rende, advanced axios in react js using create and interceptor, convert datetime value to time only in reactjs, how to save data on database in react form, error build react Failed to execute 'replaceState' on 'History': A history state object with URL 'file:///' cannot be created in a document with origin 'null' and URL, creating a new array of objects from existing array of objects lodash. true or false, how to call a function in react with arguments onclick, React Hook "useState" is called in function "app" which is neither a React function component or a custom React Hook function react-hooks/rules-of-hooks, decet wheter react app in development or production, how to load the images from the website dynamically in react. 2 minutes read The ES6 Spread Operator can be used for arrays and objects. When you use the ...props syntax, you actaully expand the props object from the parent component, which means all its attributes are passed down the child component that may not need them all. Example: Lets first look at an example: I personally rely on this deep copy strategy. This is a no-op, but it indicates a memory leak in your application. In a simple test with an array that has 100 ints, slice reported 4,420,016 ops/sec while using spread operator reported 219,263 ops/sec. A template was not provided. whatever by Disgusted Dolphin on Jun 02 2020 Donate . The delete button exists on the component. Es6 spread operator (…) We can use the es6 spread operator us to convert an array into an object. Array Spread Operator We define iterables as: strings, arrays, sets.Basically if you can loop over, then your property can be an iterable. Adjacent JSX elements must be wrapped in an enclosing tag. Both operators have many use cases and are used nowadays by most JavaScript developers to achieve the old JS tricks without getting things complex. The object spread operator is conceptually similar to the ES6 array spread operator. spread operators however, let us unpack elements in an array to single/individual arguments. setState() React State: Add item to array. Creating an Array State with useState () First, let's see how to use the useState () hook for creating an array state variable. It is mostly used in the variable array where there is more than 1 values are expected. react can only work with node and express? (See end of answer for how to fix it - create the new obj no matter what, then either push it to the new array, or replace the existing object in the array, without mutating the existing object in the array) Let's see how it works as alternative to the array … While it could be tempting to push to the array or do something like this.state.shareholders[idx].name = newName, this is not a sound approach. In fact, since most React developers make use of build systems and transpilers such as Babel to support latest JS features, you can safely use the dots syntax in your React code. The rest operator condenses elements. Spread syntax effectively goes one level deep while copying an array. For example, state updates may be asynchronous: React sometimes batches multiple setState() calls for performance reasons. Using Slice react dictionary key value avec 2 variable, how to scroll to an element javascript react, this.setstate is not a function in react native, scrollbar automatically scroll down as new divs are added reactjs, change the value in checkbox by button react, React best way of forcing component to update, react create pillbox for each chunk of array, react yup password with number string and uppercase, you should not use switch outside a router react, vscode react cannot find moudle when import image, Module not found: Can't resolve 'jquery' in react, how to add alternate image in img tag in react, how to send axios delete to the backend reactjs, react bootstrap make col disapear in small screens, react warning can't perform a react state update on an unmounted component, module not found: can't resolve 'react' in 'c:\users\pavlos\desktop\reactjs\hwr\reactproject2\src', render object id in an array reactjs from database, Setting a background Image With React Inline Styles, jest Invariant Violation: could not find react-redux context value; please ensure the component is wrapped in a . Make sure to set state correctly and to use the latest state. (The same is true with Object.assign() and spread syntax.) The initial data object contains an array rows, which itself contains an array for every single row. In this tutorial, we are going to learn about three different ways to convert an array into an object in JavaScript. spread operator does not do a deep copy if I am correct and will lead to state mutations with NESTED objects in React.. 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"> { const newTodos = todos . Did you want a JSX fragment <>...? Since the setState() may work asynchronously in manu cases for performance reasons. Syntax of Spread operator is same as Rest parameter but it works completely opposite of it. Redux: Generating Containers with connect() from React Redux (VisibleTodoList) 5m 13s. Example: JSX Spread Attributes If you know all the properties that you want to place on a component ahead of time, it is easy to use JSX: var component = < Component foo = { x } bar = { y } /> ; This will make things like debugging harder. Es6 spread operator (…) In es6, we have a spread operator(…) which helps us to create a duplicate copy of an array. To fix, cancel all subscriptions and asynchronous tasks in a useEffect cleanup function. Both operators have many use cases and are used nowadays by most JavaScript developers to achieve the old JS tricks without getting things complex. With rest parameters we were able to get a list of arguments into an array. Can't perform a React state update on an unmounted component. This is likely because you're using an outdated version of create-react-app. Rest syntax (parameters) Rest syntax looks exactly like spread syntax. But modifying them using setState () is not the same as updating normal state variables. It's a common task in React to remove an item from a list. Redux: Generating Containers with connect() from React Redux (AddTodo) 4m 41s. The spread operator allows us to expand elements. This is a clean syntax but in some cases it may be considered an anti-pattern which means you need to avoid using it. Spread operators. “react spread operator state array push usestate” Code Answer . React Key Concept. Warning: Can't perform a React state update on an unmounted component. list . Showing Array Values in Text Component one by one like ListView. The Spread operator lets you expand an iterable like a string, object or array into its elements while the Rest operator does the inverse by reducing a set of elemnts into one array. The dependency array is the second optional argument in the useEffect function. because spread syntax only creates a shallow copy of the array or object. Adding onPress-onClick method on Array Item to get its value on click event. Please use Settings.setAppElement(el), react router not working with aws amplify, react how to block render if data is not fetched yet, Autocomplete an Address with a React hook Form, props is send undefind to functional component in react js, react open on different url instead of localhost, How to Submit Forms and Save Data with React.js, how to add multiple style attributes in react element, react enzyme simulate click sub component, How to make a buttom in react stackoverflow, reactjs facebook login popup trigger on load page, how to get checked row data using react table in react js, how to enable sign-in provider in firebase console, paypal subscription based payout api reactjs, React Hook "useState" is called in function which is neither a React function component or a custom React Hook functio, this.setState is undefined inside a async function in js, set meterial icon color change onClick react, how to pass property component in react enzyme, how to return the number of nodes in a linked list, start to work with a pre existing react projects, how to make item not dragable in react-sortablejs, pass props in another component in enzyme, React looping hooks to display in other hook, how to turn of autocomplete in react hook form material ui, how to make sticky footer with react router, why does my react project dosent have any class, how to get code suggestions for react components, mock api inside react component jest async, remove state from location on page load in react router dom, react mid senior dev interview questuions, route with parameter react not working not found, testing a function in jest on click react, react select remove the loading indicator, how to store multiple date from date form field in reactjs, react history listen get previous location, how to get state value from history react, get selected value on componentdidmount reactjs, [React Intl] Missing message for locale: "en", make forn awesome icon clickable in react, How to test useEffect in react testing library, how to pass state from parent to child in react, get syntethicbaseevent and parameter in react, Rendered more hooks than during the previous rende, advanced axios in react js using create and interceptor, convert datetime value to time only in reactjs, how to save data on database in react form, error build react Failed to execute 'replaceState' on 'History': A history state object with URL 'file:///' cannot be created in a document with origin 'null' and URL, creating a new array of objects from existing array of objects lodash. true or false, how to call a function in react with arguments onclick, React Hook "useState" is called in function "app" which is neither a React function component or a custom React Hook function react-hooks/rules-of-hooks, decet wheter react app in development or production, how to load the images from the website dynamically in react. 2 minutes read The ES6 Spread Operator can be used for arrays and objects. When you use the ...props syntax, you actaully expand the props object from the parent component, which means all its attributes are passed down the child component that may not need them all. Example: Lets first look at an example: I personally rely on this deep copy strategy. This is a no-op, but it indicates a memory leak in your application. In a simple test with an array that has 100 ints, slice reported 4,420,016 ops/sec while using spread operator reported 219,263 ops/sec. A template was not provided. whatever by Disgusted Dolphin on Jun 02 2020 Donate . The delete button exists on the component. Es6 spread operator (…) We can use the es6 spread operator us to convert an array into an object. Array Spread Operator We define iterables as: strings, arrays, sets.Basically if you can loop over, then your property can be an iterable. Adjacent JSX elements must be wrapped in an enclosing tag. Both operators have many use cases and are used nowadays by most JavaScript developers to achieve the old JS tricks without getting things complex. The object spread operator is conceptually similar to the ES6 array spread operator. spread operators however, let us unpack elements in an array to single/individual arguments. setState() React State: Add item to array. Creating an Array State with useState () First, let's see how to use the useState () hook for creating an array state variable. It is mostly used in the variable array where there is more than 1 values are expected. react can only work with node and express? (See end of answer for how to fix it - create the new obj no matter what, then either push it to the new array, or replace the existing object in the array, without mutating the existing object in the array) Let's see how it works as alternative to the array … While it could be tempting to push to the array or do something like this.state.shareholders[idx].name = newName, this is not a sound approach. In fact, since most React developers make use of build systems and transpilers such as Babel to support latest JS features, you can safely use the dots syntax in your React code. The rest operator condenses elements. Spread syntax effectively goes one level deep while copying an array. For example, state updates may be asynchronous: React sometimes batches multiple setState() calls for performance reasons. Using Slice react dictionary key value avec 2 variable, how to scroll to an element javascript react, this.setstate is not a function in react native, scrollbar automatically scroll down as new divs are added reactjs, change the value in checkbox by button react, React best way of forcing component to update, react create pillbox for each chunk of array, react yup password with number string and uppercase, you should not use switch outside a router react, vscode react cannot find moudle when import image, Module not found: Can't resolve 'jquery' in react, how to add alternate image in img tag in react, how to send axios delete to the backend reactjs, react bootstrap make col disapear in small screens, react warning can't perform a react state update on an unmounted component, module not found: can't resolve 'react' in 'c:\users\pavlos\desktop\reactjs\hwr\reactproject2\src', render object id in an array reactjs from database, Setting a background Image With React Inline Styles, jest Invariant Violation: could not find react-redux context value; please ensure the component is wrapped in a . Make sure to set state correctly and to use the latest state. (The same is true with Object.assign() and spread syntax.) The initial data object contains an array rows, which itself contains an array for every single row. In this tutorial, we are going to learn about three different ways to convert an array into an object in JavaScript. spread operator does not do a deep copy if I am correct and will lead to state mutations with NESTED objects in React.. 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react spread array

We recommend using this syntax sparingly. First, React will not know that something has changed if you do this. your first web apps with Angular 8. React/ReactJS: Update An Array State As in any web application, a React application too can have multiple checkboxes and/or selects. As the name implies, it is an array of dependency’s that, when changed from the previous render, will recall the effect function defined in the first argument. The three dots act upon the number or string and it spread each item (character or number). If you are a React beginner, you may have came across the three dots syntax (...) in many React code examples which may have confused you. It's mostly useful when you want to avoid using the arguments object to access the passed arguments to a function. Some scenarios where this capability is useful include: Adding array elements to an existing array 0. push ( todo ); setTodos ( newTodos ); } The spread operator is syntactic sugar for creating a … Spread syntax "expands" an array into its elements, while rest syntax collects multiple elements and "condenses" them into a single element. Here I want to show you briefly how this works. 28. The dots syntax can be also used to call the Rest operator in ES6. Source: stackoverflow.com. Syntax: In a way, rest syntax is the opposite of spread syntax. Transcript Comments. You would need to write the following code: The state1 variable which is part of our component state will be incremented by one. Depending on your use and if perf is something you have to worry about, test things first. Spread allows you to create a new array from the existing one and add a new item to the end: const updatedUsers = [...users, newUser] console.log(users) console.log(updatedUsers) Now the new array, updatedUsers , has the new user, but the original users array remains unchanged: The spread operato r is much more powerful then it seems in this situation. value ) ; const list = state . Don’t mutate the array. The dots syntax is supported in all modern browsers which means you can use it with React with no worries. usestate array push . It lets you use the spread (...) operator to copy enumerable properties from one object to another in a more succinct way. We can simplify the todoApp example above by using the object spread syntax: React Native Get Object Value From Array and Show on Screen one by one admin December 13, 2018 December 13, 2018 React Native Array is used to hold single type of multiple values in all of programming languages but using the array of objects we can easily hold multiple types of value into a single array object. To fix, cancel all subscriptions and asynchronous tasks in a useEffect cleanup function. The spread operator (…) spreads the elements of an iterable like array or string in Javascript. Add to array const handleAdd = ( todo ) => { const newTodos = todos . Did you want a JSX fragment <>...? Since the setState() may work asynchronously in manu cases for performance reasons. Syntax of Spread operator is same as Rest parameter but it works completely opposite of it. Redux: Generating Containers with connect() from React Redux (VisibleTodoList) 5m 13s. Example: JSX Spread Attributes If you know all the properties that you want to place on a component ahead of time, it is easy to use JSX: var component = < Component foo = { x } bar = { y } /> ; This will make things like debugging harder. Es6 spread operator (…) In es6, we have a spread operator(…) which helps us to create a duplicate copy of an array. To fix, cancel all subscriptions and asynchronous tasks in a useEffect cleanup function. Both operators have many use cases and are used nowadays by most JavaScript developers to achieve the old JS tricks without getting things complex. With rest parameters we were able to get a list of arguments into an array. Can't perform a React state update on an unmounted component. This is likely because you're using an outdated version of create-react-app. Rest syntax (parameters) Rest syntax looks exactly like spread syntax. But modifying them using setState () is not the same as updating normal state variables. It's a common task in React to remove an item from a list. Redux: Generating Containers with connect() from React Redux (AddTodo) 4m 41s. The spread operator allows us to expand elements. This is a clean syntax but in some cases it may be considered an anti-pattern which means you need to avoid using it. Spread operators. “react spread operator state array push usestate” Code Answer . React Key Concept. Warning: Can't perform a React state update on an unmounted component. list . Showing Array Values in Text Component one by one like ListView. The Spread operator lets you expand an iterable like a string, object or array into its elements while the Rest operator does the inverse by reducing a set of elemnts into one array. The dependency array is the second optional argument in the useEffect function. because spread syntax only creates a shallow copy of the array or object. Adding onPress-onClick method on Array Item to get its value on click event. 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When you use the ...props syntax, you actaully expand the props object from the parent component, which means all its attributes are passed down the child component that may not need them all. Example: Lets first look at an example: I personally rely on this deep copy strategy. This is a no-op, but it indicates a memory leak in your application. In a simple test with an array that has 100 ints, slice reported 4,420,016 ops/sec while using spread operator reported 219,263 ops/sec. A template was not provided. whatever by Disgusted Dolphin on Jun 02 2020 Donate . The delete button exists on the component. Es6 spread operator (…) We can use the es6 spread operator us to convert an array into an object. Array Spread Operator We define iterables as: strings, arrays, sets.Basically if you can loop over, then your property can be an iterable. Adjacent JSX elements must be wrapped in an enclosing tag. Both operators have many use cases and are used nowadays by most JavaScript developers to achieve the old JS tricks without getting things complex. The object spread operator is conceptually similar to the ES6 array spread operator. spread operators however, let us unpack elements in an array to single/individual arguments. setState() React State: Add item to array. Creating an Array State with useState () First, let's see how to use the useState () hook for creating an array state variable. It is mostly used in the variable array where there is more than 1 values are expected. react can only work with node and express? (See end of answer for how to fix it - create the new obj no matter what, then either push it to the new array, or replace the existing object in the array, without mutating the existing object in the array) Let's see how it works as alternative to the array … While it could be tempting to push to the array or do something like this.state.shareholders[idx].name = newName, this is not a sound approach. In fact, since most React developers make use of build systems and transpilers such as Babel to support latest JS features, you can safely use the dots syntax in your React code. The rest operator condenses elements. Spread syntax effectively goes one level deep while copying an array. For example, state updates may be asynchronous: React sometimes batches multiple setState() calls for performance reasons. 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Make sure to set state correctly and to use the latest state. (The same is true with Object.assign() and spread syntax.) The initial data object contains an array rows, which itself contains an array for every single row. In this tutorial, we are going to learn about three different ways to convert an array into an object in JavaScript. spread operator does not do a deep copy if I am correct and will lead to state mutations with NESTED objects in React.. 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