How do I fix: 🔍 Why This Happens?

When you update the entire array, React re-renders the component with the new data. However, if only a single value inside the array changes, React still re-renders the entire array because it can't determine which specific item changed.

How do I fix: Method 2: Immutable Updates?

Step 1: Use the `immer` library to create a new state object with only the updated item.

Coding⏱️ 2 min read📅 2026-06-03

How to Fix: How to update single value inside specific array item in redux

Q: Best Solutions to Fix ItMethod 1: Partial Updates?

Step 1: Use the `map()` method to create a new array with only the updated item.

update specific array item in Redux reducer to reduce re-rendering

Quick Answer: use the spread operator and destructuring to update a single value inside an array item, e.g. return { ...state, contents: [...state.contents.map((item) => (item.title === action.payload ? { ...item, title: action.payload } : item))] }

📋 Table of Contents

🔍 Why This Happens
✅ Best Solutions to Fix It
💡 Conclusion

When updating a specific value inside an array item in Redux, it's common to experience re-rendering issues on the UI. This happens because React compares the entire state to determine what changed and needs to be updated. By only changing the specific value inside the array item, we can reduce the number of re-renders and improve performance.

🔍 Why This Happens

When you update the entire array, React re-renders the component with the new data. However, if only a single value inside the array changes, React still re-renders the entire array because it can't determine which specific item changed.

✅ Best Solutions to Fix It

Method 1: Partial Updates

Step 1: Use the `map()` method to create a new array with only the updated item.

Method 2: Immutable Updates

Step 1: Use the `immer` library to create a new state object with only the updated item.

💡 Conclusion

By using one of these methods, you can update specific values inside array items in Redux without causing unnecessary re-renders on your UI.

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