Web Reference: Arrays are mutable in JavaScript, but you should treat them as immutable when you store them in state. Just like with objects, when you want to update an array stored in state, you need to create a new one (or make a copy of an existing one), and then set state to use the new array. Dec 11, 2025 · Write add, remove, and update operations on arrays in state without mutations. Identify shallow copy bugs and fix them by creating new objects within new arrays. You should treat all state objects as if they are immutable. In your code, you do not actually need the setState call because the state would already be updated.
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