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2 changed files
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12 additions
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19 deletions
| 1 | -const EventEmitter = require('events'); | 1 | +const Logger = require('./logger'); |
| 2 | -const emitter = new EventEmitter(); | 2 | +const logger = new Logger(); |
| 3 | 3 | ||
| 4 | -// Register a listener | 4 | +logger.on('messageLogged', (arg) => { |
| 5 | -emitter.on('messageLogged', (arg) => { | ||
| 6 | console.log('Listener called',arg); | 5 | console.log('Listener called',arg); |
| 7 | }); | 6 | }); |
| 8 | 7 | ||
| 9 | -const log = require('./logger'); | 8 | +logger.log('message'); |
| 10 | -log('message'); | ||
| 11 | - | ||
| 12 | - | ||
| 13 | - | ||
| 14 | - | ||
| 15 | - | ... | ... |
| 1 | const EventEmitter = require('events'); | 1 | const EventEmitter = require('events'); |
| 2 | -const emitter = new EventEmitter(); | ||
| 3 | var url = 'http:mylogger.io/log'; | 2 | var url = 'http:mylogger.io/log'; |
| 4 | 3 | ||
| 5 | -function log(message) { | 4 | +// function in class won't need function keyword |
| 5 | +class Logger extends EventEmitter { | ||
| 6 | + log(message) { | ||
| 6 | // Send an HTTP request | 7 | // Send an HTTP request |
| 7 | console.log(message); | 8 | console.log(message); |
| 8 | - emitter.emit('messageLogged', {id: 1, url: 'http://' }); | ||
| 9 | -} | ||
| 10 | - | ||
| 11 | - | ||
| 12 | - | ||
| 13 | 9 | ||
| 10 | + //Raise an event | ||
| 11 | + this.emit('messageLogged', {id: 1, url: 'http://' }); | ||
| 12 | + } | ||
| 13 | +} | ||
| 14 | 14 | ||
| 15 | -module.exports = log; | 15 | +module.exports = Logger; | ... | ... |
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