NodeJS Program to EventEmitter Counter with Explanation
NodeJS
Medium
Async & Event Loop
34 views
1 min read
78 words
This problem helps you practice core NodeJS fundamentals in a practical way. It builds intuition around eventemitter, event, counter. Let’s break it down step by step so you can implement it confidently.
Problem Statement
Use EventEmitter to count events and print the total.
Input Format
No input.
Output Format
Print integer.
Constraints
Emit 'hit' event three times.
Code Solution
This explanation is written for learning purposes and to help beginners understand the concept clearly.
const { EventEmitter } = require('events');
const ee = new EventEmitter();
let count = 0;
ee.on('hit', () => { count += 1; });
ee.emit('hit');
ee.emit('hit');
ee.emit('hit');
console.log(count);
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
Use EventEmitter to count events and print the total.
Input / Output
Constraints
Emit 'hit' event three times.
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
const { EventEmitter } = require('events');
const ee = new EventEmitter();
let count = 0;
ee.on('hit', () => { count += 1; });
ee.emit('hit');
ee.emit('hit');
ee.emit('hit');
console.log(count);
Solutions (0)
No solutions submitted yet. Be the first!
