Lesson 2

docs/blog.txt

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+hello, ninjas

docs/blog2.txt

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+hello, again

files.js

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+const fs = require('fs');
+
+// reading files
+fs.readFile('./docs/blog.txt', (err, data) => {
+  if (err) {
+    console.log(err);
+  }  
+  console.log(data.toString());
+});
+
+// console.log('last line');
+
+// writing files
+fs.writeFile('./docs/blog.txt', 'hello, world', () => {
+  console.log('file was written');
+});
+
+fs.writeFile('./docs/blog2.txt', 'hello, again', () => {
+  console.log('file was written');
+});
+
+// directories
+if (!fs.existsSync('./assets')) {
+  fs.mkdir('./assets', err => {
+    if (err) {
+      console.log(err);
+    }
+    console.log('folder created');
+  });
+} else {
+  fs.rmdir('./assets', err => {
+    if (err) {
+      console.log(err);
+    }
+    console.log('folder deleted');
+  });
+}
+
+// deleting files
+if (fs.existsSync('./docs/deleteme.txt')) {
+  fs.unlink('./docs/deleteme.txt', err => {
+    if (err) {
+      console.log(err);
+    }
+    console.log('file deleted');
+  });
+}

global.js

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+const speak = () => {
+  console.log('hello, ninjas');
+}
+
+speak();
+
+// Global Object
+
+// console.log(global);
+
+// global.setTimeout(() => {
+//   console.log('in the timeout');
+// }, 3000);
+
+setTimeout(() => {
+  console.log('in the timeout');
+  clearInterval(int);
+}, 3000);
+
+const int = setInterval(() => {
+  console.log('in the interval');
+}, 1000);
+
+console.log(__dirname);
+console.log(__filename);
+
+// no access to DOM methods
+console.log(document.querySelector);

modules.js

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+// const people = require('./people');
+
+// console.log(people);
+
+// const data = require('./people');
+
+// console.log(data.people, data.ages);
+
+const { people, ages } = require('./people');
+
+console.log(people, ages);
+
+const os = require('os');
+
+console.log(os.platform(), os.homedir());
+
+
+
+

people.js

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+const people = ['yoshi', 'ryu', 'chun-li', 'mario'];
+const ages = [20, 25, 30, 35];
+
+// console.log(people);
+
+// module.exports = people;
+
+module.exports = {
+  people,
+  ages,
+}

streams.js

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+const fs = require('fs');
+
+const readStream = fs.createReadStream('./docs/blog3.txt', { encoding: 'utf8'});
+const writeStream = fs.createWriteStream('./docs/blog4.txt');
+
+readStream.on('data', chunk => {
+  // console.log('---- NEW CHUNK ----');
+  // console.log(chunk);
+  writeStream.write('\nNEW CHUNK:\n');
+  writeStream.write(chunk);
+});
+
+// piping
+// readStream.pipe(writeStream);