Rewrite examples

Author: tshemsedinov

JavaScript/4-then.js

@@ -0,0 +1,17 @@
+'use strict';
+
+const fs = require('fs');
+
+const readTextFile = filename => fs.promises.readFile(filename, 'utf8');
+
+readTextFile('file1-.txt')
+  .then(data => {
+    console.dir({ file1: data });
+  })
+  .catch(reason => {
+    console.log('Cannot read file1.txt');
+    console.log(reason);
+  })
+  .finally(() => {
+    console.log('finally');
+  });

JavaScript/5-finally.js

@@ -0,0 +1,31 @@
+'use strict';
+
+const http = require('http');
+
+const fetch = url => new Promise((resolve, reject) => {
+  http.get(url, res => {
+    const code = res.statusCode;
+    if (code !== 200) {
+      return reject(new Error(`HTTP status code ${code}`));
+    }
+
+    res.on('error', reject);
+
+    const chunks = [];
+    res.on('data', chunk => {
+      chunks.push(chunk);
+    });
+
+    res.on('end', () => {
+      const json = Buffer.concat(chunks).toString();
+      try {
+        const object = JSON.parse(json);
+        resolve(object);
+      } catch (error) {
+        return reject(error);
+      }
+    });
+  });
+});
+
+module.exports = fetch;