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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


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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

Suggested Fix

Possible Solution for "Uncaught TypeError: Cannot read properties of undefined"

This error indicates that the code is trying to read a property from an undefined or null value. In the provided code snippet, the error is occurring on line 27 of Home.js where it's trying to access the results property of an object that seems to be undefined.

To fix this issue, you should ensure that the state object is always initialized with the initialState object in the useHomeFetch custom hook. It seems that the state is never initialized with any value, causing the results property to be undefined.

You can update the useState hook to initialize state with initialState:

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const [state, setState] = useState(initialState); // Initialize state with initialState

By initializing the state with the initialState object, you ensure that the results property is available when accessing state.results. This should resolve the "Uncaught TypeError" issue in your React component.

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