Oh, man, My problem did not solve let me specify more I have a state that named bar and I have a function named addBar and this function add the last item of the bar to the bar but I want to copy it without reference I do what you said but it didn't work for me, `` addBar = () => { let bar = [this.state.bars,{this.state.bars[this.state.bars.length - 1]}] this.setState({ bars:bar }) } `` this code must add the last item of the bar to the bar but it doesn't work. Is it at all possible to update object's properties with setState? You will learn When an In the above code, we have updated the obj.c.d property value to 34 but our shallowClone.c.d property value is also updated because its still holding the reference to an original object obj. React developers often have to copy the existing state object, make the necessary changes to the copy, call the setState () method, and provide the copy as an argument. Since useState returns an array we are able to destructure the current state value and a function that lets you update the state. is only shallow copying the data, your attachments property has some nested objects and it keeps the same reference and therefore when changing it, the cloned object gets altered and the state too. ReactDeepcopy - PHP Creating the state Object The state object is initialized in the constructor: Example: Get your own React.js Server Is a PhD visitor considered as a visiting scholar? My latest, Creating Reusable React Components just published! But the "const NC = JSON.parse(JSON.stringify(this.state.newCoop)) " from your link did the trick! Should I include its attributes in my question? Please help us improve Stack Overflow. Copy array by value (39 answers) Closed 4 years ago. Is it suspicious or odd to stand by the gate of a GA airport watching the planes. Connect and share knowledge within a single location that is structured and easy to search. Why does Mister Mxyzptlk need to have a weakness in the comics? We can also use the array as a state variable while using the React hooks. provides a proxy object, referred to as a draft, so while your code appears Not the answer you're looking for? This updates jasper but other properties are removed from the state. You have to clone the nested level objects/arrays as well, in order to avoid referencing original values. Thanks for contributing an answer to Stack Overflow! A place where magic is studied and practiced? What is the difference between React Native and React? This is a cheat sheet on how to do add, remove, and update items in an array or object within the context of managing React state.

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