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In the Leetcode page the ItemPage component, a TypeError occurs when attempting to access a JavaScript property on itemData, which causes the application to crash. This error seems to be due to itemData being undefined at the time of property access.
Steps to Reproduce
Navigate to the ItemPage component.
Ensure itemData is populated in the Leetcode table.
Observe the console error when attempting to render the component.
Expected Outcome
The component should render without errors, displaying information contained within the itemData.javascript property.
Actual Outcome
The application crashes with a TypeError indicating that itemData is undefined when attempting to access its properties
Code Context
Below is a code snippet from the ItemPage component where the error occurs:
// Code that may cause the issue
const languageData = itemData.javascript; // `javascript` property may be undefined in `itemData`
Data Structure Requirements
The itemData object passed to the ItemPage component should contain a javascript property to avoid this error. Expected structure:
isit https://reactjs.org/link/error-boundaries to learn more about error boundaries.
logCapturedError @ react-dom.development.js:18704
update.callback @ react-dom.development.js:18737
callCallback @ react-dom.development.js:15036
commitUpdateQueue @ react-dom.development.js:15057
commitLayoutEffectOnFiber @ react-dom.development.js:23430
commitLayoutMountEffects_complete @ react-dom.development.js:24727
commitLayoutEffects_begin @ react-dom.development.js:24713
commitLayoutEffects @ react-dom.development.js:24651
commitRootImpl @ react-dom.development.js:26862
commitRoot @ react-dom.development.js:26721
finishConcurrentRender @ react-dom.development.js:25931
performConcurrentWorkOnRoot @ react-dom.development.js:25848
workLoop @ scheduler.development.js:266
flushWork @ scheduler.development.js:239
performWorkUntilDeadline @ scheduler.development.js:533
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ItemPage.jsx:26 Uncaught TypeError: Cannot read properties of undefined (reading 'javascript')
at ItemPage (ItemPage.jsx:26:1)
at renderWithHooks (react-dom.development.js:15486:1)
at mountIndeterminateComponent (react-dom.development.js:20103:1)
at beginWork (react-dom.development.js:21626:1)
at beginWork$1 (react-dom.development.js:27465:1)
at performUnitOfWork (react-dom.development.js:26596:1)
at workLoopSync (react-dom.development.js:26505:1)
at renderRootSync (react-dom.development.js:26473:1)
at recoverFromConcurrentError (react-dom.development.js:25889:1)
at performConcurrentWorkOnRoot (react-dom.development.js:25789:1)
Suggested Investigation and Potential Fixes
Root Cause Analysis
Confirm whether all instances of itemData are expected to include the javascript property. Check the data source for consistency and investigate why some itemData objects might lack this property.
Data Validation
Ensure that the itemData object consistently includes the javascript property when passed to the ItemPage component. This may involve validation or restructuring at the data source to standardize the data.
Fallback Value
Implement a fallback or default value for javascript in the ItemPage component to handle cases where itemData lacks this property. Example:
const languageData = itemData?.javascript ?? "No solution available";
Conditional Checks
Add a conditional check to confirm the presence of the javascript property before accessing it:
To avoid similar issues in the future, implement a test case to check the consistency of itemData properties, ensuring that all required fields are present.
Issue: TypeError in
ItemPageComponentDescription:
In the Leetcode page the ItemPage component, a TypeError occurs when attempting to access a JavaScript property on itemData, which causes the application to crash. This error seems to be due to itemData being undefined at the time of property access.
Steps to Reproduce
ItemPagecomponent.itemDatais populated in the Leetcode table.Expected Outcome
The component should render without errors, displaying information contained within the
itemData.javascriptproperty.Actual Outcome
The application crashes with a
TypeErrorindicating thatitemDataisundefinedwhen attempting to access its propertiesCode Context
Below is a code snippet from the
ItemPagecomponent where the error occurs:Data Structure Requirements
The itemData object passed to the ItemPage component should contain a javascript property to avoid this error. Expected structure:
Environment Details
Attached Error and Logs
Recent Changes
no Changes
Error Messages - Console Output
Suggested Investigation and Potential Fixes
Root Cause Analysis Confirm whether all instances of itemData are expected to include the javascript property. Check the data source for consistency and investigate why some itemData objects might lack this property.
Data Validation Ensure that the itemData object consistently includes the javascript property when passed to the ItemPage component. This may involve validation or restructuring at the data source to standardize the data.
Fallback Value Implement a fallback or default value for javascript in the ItemPage component to handle cases where itemData lacks this property. Example:
const languageData = itemData?.javascript ?? "No solution available";Conditional Checks Add a conditional check to confirm the presence of the javascript property before accessing it:
Automated Data Consistency Test
To avoid similar issues in the future, implement a test case to check the consistency of itemData properties, ensuring that all required fields are present.