EventEmitter once()
Medium
NodeJS
Async & Event Loop
30 views
Problem Statement
Listen to an event only once and print count.
Input Format
No input.
Output Format
Print integer.
Constraints
Emit twice but handler runs once.
Input / Output Format
Input Format
No input.
Output Format
Print integer.
Constraints
Emit twice but handler runs once.
Examples
Input:
Output:
1
Example Solution (Public)
const { EventEmitter } = require('events');
const ee = new EventEmitter();
let n = 0;
ee.once('meetcode', () => { n += 1; });
ee.emit('meetcode');
ee.emit('meetcode');
console.log(n);
Official Solution Code
const { EventEmitter } = require('events');
const ee = new EventEmitter();
let n = 0;
ee.once('meetcode', () => { n += 1; });
ee.emit('meetcode');
ee.emit('meetcode');
console.log(n);
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