NodeJS Program to Unhandled Rejection Handler with Explanation
NodeJS
Hard
Node Basics & Modules
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1 min read
81 words
This problem helps you practice core NodeJS fundamentals in a practical way. It builds intuition around unhandled, rejection, handler. Let’s break it down step by step so you can implement it confidently.
Problem Statement
Handle unhandledRejection and print a friendly message.
Input Format
No input.
Output Format
Print one line.
Constraints
Add a process listener and trigger rejection.
Code Solution
This explanation is written for learning purposes and to help beginners understand the concept clearly.
process.on('unhandledRejection', (reason) => {
const msg = reason && reason.message ? reason.message : String(reason);
console.log('Unhandled: ' + msg);
});
Promise.reject(new Error('meetcode'));
Output Example
No sample I/O is provided for this question.
Common Mistakes
- Misreading input/output format.
- Not handling constraints and edge cases.
- Off-by-one errors in loops.
- Forgetting to reset variables between test cases (if any).
Solution Guide
Problem
Handle unhandledRejection and print a friendly message.
Input / Output
Constraints
Add a process listener and trigger rejection.
Examples
Output:
Unhandled: meetcode
Details
Common Mistakes
- Misreading input/output format.
- Not handling constraints and edge cases.
- Off-by-one errors in loops.
- Forgetting to reset variables between test cases (if any).
Official Solution
process.on('unhandledRejection', (reason) => {
const msg = reason && reason.message ? reason.message : String(reason);
console.log('Unhandled: ' + msg);
});
Promise.reject(new Error('meetcode'));
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