suckitfa / nodejs-tour

buit-in modules

• os
• path
• fs
• http

npm

upcoming topics

• event-loop

// offer no-blocking I/O
// Bert Belder:Everything you need to know Event-loop

• async patterns

async / await
promisify

• event emitter

const EventEmitter = require('events')

const customEmitter = new EventEmitter()

// on order matters!!!
customEmitter.on('event1',() => {
    console.log('event1')
})

customEmitter.on('event1', () => {
    console.log('event1 rescisdlfjksaldjfxx')
})

customEmitter.emit('event1')

• streams

const {createReadStream} = require('fs')

const stream = createReadStream('./content/big.txt',{highWaterMark: 90000,encoding:'utf8'})

stream.on('data', (result) => {
    console.log(result)
})

stream.on('error' ,() => {
    console.log('error')
})

const http = require('http')
const fs = require('fs')

http.createServer((req,res) => {
    const fileStream = fs.createReadStream('./content/big.txt','utf8')
    fileStream.on('open' , (file) => {
        fileStream.pipe(res)
    })

    fileStream.on('error', (err) => {
        res.end(err)
    })
}).listen(5000)

express

• API - JSON - res.json()
• SSR - Template - res.render()