Node.js crash course

.gitignore

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+#DS_Store
+.DS_Store
+
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+*.lcov
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# TypeScript v1 declaration files
+typings/
+
+# TypeScript cache
+*.tsbuildinfo
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Microbundle cache
+.rpt2_cache/
+.rts2_cache_cjs/
+.rts2_cache_es/
+.rts2_cache_umd/
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+.env.test
+
+# parcel-bundler cache (https://parceljs.org/)
+.cache
+
+# Next.js build output
+.next
+
+# Nuxt.js build / generate output
+.nuxt
+dist
+
+# Gatsby files
+.cache/
+# Comment in the public line in if your project uses Gatsby and *not* Next.js
+# https://nextjs.org/blog/next-9-1#public-directory-support
+# public
+
+# vuepress build output
+.vuepress/dist
+
+# Serverless directories
+.serverless/
+
+# FuseBox cache
+.fusebox/
+
+# DynamoDB Local files
+.dynamodb/
+
+# TernJS port file
+.tern-port

Reference/event_demo.js

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+const EventEmitter = require('events')
+
+// Create class
+class MyEmitter extends EventEmitter { }
+
+// Init object 
+const myEmitter = new MyEmitter()
+
+// Event listener
+myEmitter.on('event', () => console.log('Event Fired!'))
+
+// Init event
+myEmitter.emit('event')
+myEmitter.emit('event')
+myEmitter.emit('event')
+myEmitter.emit('event')
+
+

Reference/fs_demo.js

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+const fs = require('fs')
+const path = require('path')
+
+// Rename file
+fs.rename(path.join(__dirname, '/test', 'hello.txt'), path.join(__dirname, '/test', 'helloworld.txt'), function(err){
+    if(err) throw err
+    console.log('File renamed...')
+})
+// File renamed...

Reference/http_demo.js

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+const http = require('http')
+
+// Create server object
+http
+.createServer((req, res) => {
+    // Write response 
+    res.write('Hello World')
+    res.end()
+})
+.listen(5000, () => console.log('Server running...'))

Reference/os_demo.js

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+const os = require('os')
+
+// Pladform
+console.log(os.platform())
+
+// CPU Arch
+console.log(os.arch())
+
+// CPU Core Info
+console.log(os.cpus())
+
+// Free memory
+console.log(os.freemem())
+
+// Total memory
+console.log(os.totalmem())
+
+// Home Dir
+console.log(os.homedir())
+
+// Uptime
+console.log(os.uptime())

Reference/path_demo.js

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+const path = require('path')
+
+// Base file name
+console.log(path.basename(__filename))
+//path_demo.js
+
+// Directory name
+console.log(path.dirname(__filename))
+///Users/matthijsblauw/Documents/1. School/Blok 1/Sprint 9/the-web-is-for-everyone-coding-the-curbs/Reference
+
+// File extention
+console.log(path.extname(__filename))
+
+// Create path object
+console.log(path.parse(__filename))
+/*{
+    root: '/',
+    dir: '/Users/matthijsblauw/Documents/1. School/Blok 1/Sprint 9/the-web-is-for-everyone-coding-the-curbs/Reference',
+    base: 'path_demo.js',
+    ext: '.js',
+    name: 'path_demo'
+}    */
+
+// Concatenate paths
+console.log(path.join(__dirname, 'test', 'hello.html'))
+// ../the-web-is-for-everyone-coding-the-curbs/Reference/test/hello.html
+

Reference/test/helloworld.txt

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+Hallo World! Ik hou van Node.js

Reference/url_demo.js

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+const url = require('url')
+
+const myUrl = new URL('http://mybsite.com/helo.html?id=100&status=active')
+
+// Serialize URL
+console.log(myUrl.href)
+console.log(myUrl.toString())
+// http://mybsite.com/helo.html?id=100&status=active
+
+// Host (root domain)
+console.log(myUrl.host)
+// Hostname (does net get port)
+console.log(myUrl.hostname)
+// mybsite.com
+
+// Pathname
+console.log(myUrl.pathname)
+// /helo.html
+
+// Serialized query
+console.log(myUrl.search)
+// ?id=100&status=active
+
+// Params object
+console.log(myUrl.searchParams)
+// URLSearchParams { 'id' => '100', 'status' => 'active' }
+
+// Add param
+myUrl.searchParams.append('abc', '123')
+console.log(myUrl.searchParams)
+// URLSearchParams { 'id' => '100', 'status' => 'active', 'abc' => '123' }
+
+// Loop through params
+myUrl.searchParams.forEach((value, name) => console.log(`${name}: ${value}`))
+// id: 100
+// status: active
+// abc: 123
+

index.js

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+const http = require('http')
+const path = require('path')
+const fs = require('fs')
+
+const server = http.createServer((req, res) => {
+    console.log(req.url)
+    if(req.url === '/'){
+        fs.readFile(path.join(__dirname, 'public', 'index.html'), (err, content) => {
+            if(err) throw err
+            res.writeHead(200, { 'Content-Type': 'text/html'})
+            res.end(content)
+        })
+    }
+
+    if(req.url === '/about'){
+        fs.readFile(path.join(__dirname, 'public', 'about.html'), (err, content) => {
+            if(err) throw err
+            res.writeHead(200, { 'Content-Type': 'text/html'})
+            res.end(content)
+        })
+    }
+
+    // Rest API of een micro service
+    if(req.url === '/api/users'){
+        const users = [
+            { name: 'Matthijs Blauw', age: '21'},
+            { name: 'Emilio Rosini', age: '20'}
+        ]
+        res.writeHead(200, { 'Content-Type': 'application/json'})
+        res.end(JSON.stringify(users))    
+    }
+})
+
+const PORT = process.env.PORT || 5000
+
+server.listen(PORT, () => console.log(`Server running on port ${PORT}`))

logger.js

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+const EventEmitter = require('events')
+const uuid = require('uuid')
+
+class Logger extends EventEmitter{
+    log(msg) {
+        // Class event
+        this.emit('message', { id: uuid.v4(), msg })
+    }
+}
+
+// module.exports = Logger
+// const Logger = require('./logger')
+
+const logger = new Logger()
+
+logger.on('message', (data) => console.log('Called Listener', data))
+
+logger.log('Hello World')
+logger.log('Hi')
+logger.log('Hello')