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Error in React component

Programming Languages

JavaScript

React.js

Error Message or Problem

Home.js:27 Uncaught TypeError: Cannot read properties of undefined (reading 'results') at Home (Home.js:27) at renderWithHooks (react-dom.development.js:14985) at mountIndeterminateComponent (react-dom.development.js:17811) at beginWork (react-dom.development.js:19049)

Steps or Code to Reproduce

import { useState, useEffect, useRef } from "react"; import reactDom from "react-dom"; //API import API from "../API"; //initial state const initialState = { page: 0, results: [], total_pages: 0, total_results: 0, }; export const useHomeFetch = () => { const [searchTerm, setSearchTerm] = useState(""); const [state, setState] = useState(); const [loading, setLoading] = useState(false); const [error, setError] = useState(false); const fetchMovies = async (page, searchTerm = "") => { try { setError(false); setLoading(true); const movies = await API.fetchMovies(searchTerm, page); setState((prev) => ({ ...movies, results: page > 1 && prev ? [...prev.results, ...movies.results] : [...movies.results], })); } catch (error) { setError(true); } setLoading(false); }; //initial ans search useEffect(() => { // setState(initialState); fetchMovies(1); }, []); return { state, loading, error, setSearchTerm }; };

Suggested Fix

Error Analysis:

The error message you provided indicates that there is an issue with reading the 'results' property of an object in your Home.js file at line 27. The error occurs because the results property is being accessed on an undefined object.

Solution:

Looking at your code snippet, the issue occurs when setting the state in the fetchMovies function. The state is being updated with the spread operator on the movies object, but the movies object might be undefined due to failed API call or other reasons.

To handle this issue:

Check if the movies object is not undefined before trying to access its properties.
Initialize the state with the initialState object having a 'results' property to prevent undefined errors when accessing it.

Updated Code:

javascript

By adding these checks in place, you should be able to prevent the 'TypeError: Cannot read properties of undefined' error in your React application. This modification ensures that the movies object is valid before accessing its 'results' property.

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