Week11

01-node-tutorial/02-globals.js

@@ -6,7 +6,9 @@
 // module     - info about current module (file)
 // process    - info about env where the program is being executed
 
-console.log(__dirname)
 setInterval(() => {
   console.log('hello world')
 }, 1000)
+console.log('__dirname:', __dirname);
+console.log('process.env.MY_VAR:', process.env.MY_VAR);
+console.log('__filename:', __filename);

01-node-tutorial/03-modules.js

@@ -7,3 +7,4 @@ require('./07-mind-grenade')
 sayHi('susan')
 sayHi(names.john)
 sayHi(names.peter)
+console.log(data)

01-node-tutorial/10-fs-sync.js

@@ -1,4 +1,4 @@
-const { readFileSync, writeFileSync } = require('fs')
+const { readFileSync, writeFileSync, write, writeFile, readFile } = require('fs')
 console.log('start')
 const first = readFileSync('./content/first.txt', 'utf8')
 const second = readFileSync('./content/second.txt', 'utf8')
@@ -8,5 +8,10 @@ writeFileSync(
   `Here is the result : ${first}, ${second}`,
   { flag: 'a' }
 )
+writeFileSync('./answers/temporary/fileA.txt',"Testing this",{flag:'a'})
+writeFileSync('./answers/temporary/fileA.txt',"Testing t23his",{flag:'a'})
+writeFileSync('./answers/temporary/fileA.txt',"Testing t2123his",{flag:'a'})
+const readingFIleA = readFileSync('./answers/temporary/fileA.txt','utf8')
+console.log(readingFIleA)
 console.log('done with this task')
 console.log('starting the next one')

01-node-tutorial/11-fs-async.js

@@ -1,4 +1,4 @@
-const { readFile, writeFile } = require('fs')
+const { readFile, writeFile, write, writeFileSync } = require('fs')
 
 console.log('start')
 readFile('./content/first.txt', 'utf8', (err, result) => {
@@ -27,3 +27,40 @@ readFile('./content/first.txt', 'utf8', (err, result) => {
   })
 })
 console.log('starting next task')
+
+readFile('./answers/temporary/fileB.txt','utf8',(err,result)=> {
+  if(err){
+    console.log("The file was not read OH NOO",err)
+    return
+  }else{
+    const firstGrocery = result 
+    writeFileSync('./answers/temporary/fileB.txt',"Pizza 10.25$",(err,result)=>{
+      if(err){
+        console.log(err)
+        return 
+      }
+      console.log("Finnaly wrote the first grocery")
+    })
+     const secondGrocery = result
+      writeFileSync('./answers/temporary/fileB.txt',"Lemons 20.30$",(err,result)=>{
+        if(err){
+          console.log(err)
+          return 
+        }
+        console.log("Finnaly wrote teh second grocery")
+
+      }) 
+      const thirdGrocery = result
+       writeFileSync('./answers/temporary/fileB.txt',"Potato 20.30$",(err,result)=>{
+        if(err){
+          console.log(err)
+          return 
+        }
+        console.log("Finnaly wrote teh second grocery")
+
+      })  
+
+
+  }
+})
+console.log("This is the end")

01-node-tutorial/12-http.js

@@ -1,17 +1,17 @@
 const http = require('http')
 
 const server = http.createServer((req, res) => {
-  //   if (req.url === '/') {
-  //     res.end('Welcome to our home page')
-  //   }
-  //   if (req.url === '/about') {
-  //     res.end('Here is our short history')
-  //   }
-  //   res.end(`
-  //   <h1>Oops!</h1>
-  // <p>We can't seem to find the page you are looking for</p>
-  // <a href="/">back home</a>
-  //   `)
+    if (req.url === '/') {
+      res.end('Welcome to our home page')
+    }
+    if (req.url === '/about') {
+      res.end('Here is our short history')
+    }
+    res.end(`
+    <h1>Oops!</h1>
+  <p>We can't seem to find the page you are looking for</p>
+  <a href="/">back home</a>
+    `)
   // ###################################
   // ###################################
   //

01-node-tutorial/answers/.gitignore

@@ -0,0 +1,3 @@
+/node_modules
+.DS_Store
+temp.txt

01-node-tutorial/answers/16-stream.js

@@ -0,0 +1,32 @@
+const { createReadStream } = require("fs");
+const path = require("path");
+
+// Create the path to the big file
+const filePath = path.join(__dirname, "../content/big.txt");
+
+// Create the read stream with encoding and highWaterMark
+const stream = createReadStream(filePath, {
+    encoding: "utf8",
+    highWaterMark: 200   // You will change this number to test later
+});
+
+let counter = 0;
+
+// Handle data event
+stream.on("data", (chunk) => {
+    counter++;
+    console.log(`Chunk #${counter}:`);
+    console.log(chunk);
+    console.log("--------------------------------------------------");
+});
+
+// Handle end event
+stream.on("end", () => {
+    console.log(`\nFinished reading file.`);
+    console.log(`Total chunks received: ${counter}`);
+});
+
+// Handle error event
+stream.on("error", (err) => {
+    console.error("Error:", err);
+});

01-node-tutorial/answers/customEmitter.js

@@ -0,0 +1,6 @@
+const EventEmitter = require("events");  
+const emitter = new EventEmitter();  
+setInterval(() => {  
+  emitter.emit("timer", "hi there");  
+}, 2000);  
+emitter.on("timer", (msg) => console.log(msg));