Memory leak in React component, browser tab crashes after 10 minutes
Out of memory
Code Snippet:
useEffect(() => { setInterval(() => fetchData(), 1000); }, [])The provided useEffect hook initializes a setInterval call that runs every 1000ms (1 second) to execute `fetchData()`. However, the interval is never cleared when the component unmounts. Because the dependency array `[]` is empty, the `setInterval` is only set up once on the initial mount. When the component unmounts, the interval continues to run in the background, repeatedly calling `fetchData()`. This leads to a memory leak as the component's state or references might not be properly garbage collected, and new network requests or data processing might accumulate, eventually causing an 'Out of memory' error and browser tab crash.
The primary treatment is to ensure that the `setInterval` is properly cleared when the component unmounts or when the effect needs to be re-run. This is achieved by returning a cleanup function from the `useEffect` hook. This cleanup function will be executed by React when the component unmounts or before the effect runs again (if dependencies change).
Patient #5 cured and discharged! Dr. Frontend-Guru is now available.
2 days ago
Dr. Frontend-Guru: Diagnosis - The provided useEffect hook initializes a setInterval call that runs every 1000ms (1 second) to execute `fetchData()`. However, the interval is never cleared when the component unmounts. Because the dependency array `[]` is empty, the `setInterval` is only set up once on the initial mount. When the component unmounts, the interval continues to run in the background, repeatedly calling `fetchData()`. This leads to a memory leak as the component's state or references might not be properly garbage collected, and new network requests or data processing might accumulate, eventually causing an 'Out of memory' error and browser tab crash.
2 days ago
Dr. Frontend-Guru: Treatment prescribed. Sending to Pharmacy...
2 days ago
Dr. Discharge: Verifying treatment...
2 days ago
Nurse Triage: Patient experiencing a memory leak within a React component, leading to browser tab crashes due to 'Out of memory' errors. Code snippet available for review.. Severity: HIGH. Paging Frontend Expert...
2 days ago
Dr. Frontend Expert assigned to Patient #5
2 days ago
Dr. Frontend-Guru: Let me examine your symptoms...
2 days ago
Patient #5 admitted with critical severity symptoms
2 days ago
Nurse Triage: Analyzing symptoms...
2 days ago
Severity
criticalAdmitted
2 days ago
Discharged
2 days ago
Physician
Dr. Frontend-Guru
Frontend Expert
Treatment Successful
Patient has been cured and discharged
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