Got everything to work but http-json-api-server.js

baby-steps.js

@@ -0,0 +1 @@
+console.log(process.argv.slice(2).reduce((a,b) => Number(a) + Number(b)))

filtered-ls.js

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+const fs = require('fs')
+
+const dirName = process.argv[2]
+const fileExtension = process.argv[3]
+
+fs.readdir(dirName,
+    function callback (err, list) {
+        if (err) throw err
+
+        const re = new RegExp("\." + fileExtension + "$")
+        const filteredList = list.filter((item) => re.test(item))
+
+        console.log(filteredList.join('\n'))
+        })
+

hello-world.js

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+console.log('HELLO WORLD')

http-client.js

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+const http = require('http')
+
+http.get(process.argv[2], (response) => {
+        response.setEncoding('utf8')
+        response.on('data', (data) => {
+            console.log(data)
+            })
+        })

http-collect.js

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+const http = require('http')
+let fullResult = ''
+
+http.get(process.argv[2], (response) => {
+        response.setEncoding('utf8')
+        response.on('data', (data) => {
+            fullResult += data
+            })
+        response.on('end', () => {
+            console.log(fullResult.length)
+            console.log(fullResult)
+        })
+    })

http-file-server.js

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+const http = require('http')
+const fs = require('fs')
+const port = process.argv[2]
+const filePath = process.argv[3]
+
+const server = http.createServer(function listener(req, res) {
+    const stream = fs.createReadStream(filePath)
+    let text = ""
+    stream.on('data', (chunk) => {
+        text += chunk
+    })
+    stream.on('end', () => {
+        res.end(text)
+    })
+})
+
+server.listen(port)

http-json-api-server.js

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+const http = require('http')
+const port = process.argv[2]
+
+const server = http.createServer(function listener(req, res) {
+    res.writeHead(200, { 'Content-Type': 'application/json' }) 
+
+    const path = req.url.split("?")[0]
+    const value = req.url.split("=")[1]
+
+    const date = new Date(value)
+
+    if (path == "/api/parsetime")
+        res.end(JSON.stringify({hour: date.getHours(),
+            minute: date.getMinutes(),
+            second: date.getSeconds()
+        }))
+    else if (path == "/api/unixtime")
+        res.end(JSON.stringify({unixtime: date.getTime()}))
+    else {
+        res.writeHead(404)
+        res.end()
+    }
+})
+
+server.listen(port)

http-uppercaser.js

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+const http = require('http')
+const fs = require('fs')
+const port = process.argv[2]
+const filePath = process.argv[3]
+
+const server = http.createServer(function listener(req, res) {
+    let output = ""
+    req.on('data', (chunk) => {
+        output += String(chunk).toUpperCase()
+    })
+    req.on('end', () => {
+        res.end(output)
+    })
+})
+
+server.listen(port)

juggling-async.js

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+const http = require('http')
+let fullData = ["", "", ""]
+let done = [false, false, false]
+
+function finish() {
+    console.log(fullData[0])
+    console.log(fullData[1])
+    console.log(fullData[2])
+}
+
+function callback(response,id) {
+    response.setEncoding('utf8')
+    response.on('data', (data) => {
+        fullData[id] += data
+        })
+    response.on('end', () => {
+        done[id] = true
+        if (done.every(d => d)) {
+            finish()
+        }
+    })
+}
+
+http.get(process.argv[2], (response) => { callback(response,0) })
+http.get(process.argv[3], (response) => { callback(response,1) })
+http.get(process.argv[4], (response) => { callback(response,2) })

make-it-modular.js

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+const mymodule = require('./mymodule')
+const fileExtension = process.argv[3]
+
+mymodule(process.argv[2], process.argv[3],
+    function callback(err, data) {
+        console.log(data.join('\n'))
+    }
+)

my-first-async-io.js

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+const fs = require('fs')
+fs.readFile(process.argv[2],'utf8',
+    function callback (err,data) {
+        if (err) throw err
+        console.log(data.match(/\n/g).length)
+})

my-first-io.js

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+const fs = require('fs')
+const file = fs.readFileSync(process.argv[2],'utf8')
+console.log(file.match(/\n/g).length)

mymodule.js

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+module.exports = function (dirName, fileExtension, callback) {
+
+    const fs = require('fs')
+
+    fs.readdir(dirName, function (err, data) {
+        if (err) return callback(err)
+
+        const re = new RegExp("\." + fileExtension + "$")
+        callback(err, data.filter((item) => re.test(item)))
+
+    })
+}

time-server.js

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+const net = require('net')
+const port = process.argv[2]
+
+const server = net.createServer(function listener(socket) {
+    const date = new Date()
+    const dateString = date.getFullYear() + "-" +
+        (date.getMonth()+1).toString().padStart(2,'0') + "-" +
+        date.getDate().toString().padStart(2,'0') + " " +
+        date.getHours().toString().padStart(2,'0') + ":" +
+        date.getMinutes().toString().padStart(2,'0') + "\n"
+
+    socket.end(dateString)
+})
+
+server.listen(port)