Improve examples

tshemsedinov · tshemsedinov · commit e701b622948b · 2018-10-11T13:58:38.000+03:00
diff --git a/JavaScript/1-readable.js b/JavaScript/1-readable.js
@@ -8,12 +8,11 @@ rs.on('readable', () => {
   console.log('readable');
   const buffer = rs.read();
   if (buffer) {
-    console.log(buffer);
-    console.log(buffer.toString());
+    console.dir({ buffer });
   }
 });
 
 rs.on('data', chunk => {
   console.log('data');
-  console.log(chunk);
+  console.log({ chunk });
 });
diff --git a/JavaScript/2-writable.js b/JavaScript/2-writable.js
@@ -6,7 +6,7 @@ const rs = fs.createReadStream('1-readable.js', 'utf8');
 const ws = fs.createWriteStream('copy.js', 'utf8');
 
 rs.on('data', buffer => {
-  console.log('Copy ' + buffer.length + ' chars');
+  console.log(`Copy ${buffer.length} chars`);
   ws.write(buffer);
 });
 
diff --git a/JavaScript/6-http-safeStart.js b/JavaScript/6-http-safeStart.js
@@ -4,7 +4,15 @@ const fs = require('fs');
 const zlib = require('zlib');
 const http = require('http');
 
+const once = fn => (...args) => {
+  if (!fn) return;
+  const res = fn(...args);
+  fn = null;
+  return res;
+};
+
 const prepareCache = callback => {
+  callback = once(callback);
   let buffer = null;
 
   const rs = fs.createReadStream('index.html');
@@ -21,21 +29,14 @@ const prepareCache = callback => {
     callback(null, buffer);
   });
 
-  rs.on('error', error => {
-    callback(error);
-  });
-
-  gs.on('error', error => {
-    callback(error);
-  });
+  rs.on('error', callback);
+  gs.on('error', callback);
 
   rs.pipe(gs);
 };
 
 const startServer = (err, buffer) => {
-  if (err) {
-    throw err;
-  }
+  if (err) throw err;
 
   const server = http.createServer((request, response) => {
     console.log(request.url);
diff --git a/JavaScript/copy.js b/JavaScript/copy.js
@@ -0,0 +1,18 @@
+'use strict';
+
+const fs = require('fs');
+
+const rs = fs.createReadStream('1-readable.js', 'utf8');
+
+rs.on('readable', () => {
+  console.log('readable');
+  const buffer = rs.read();
+  if (buffer) {
+    console.dir({ buffer });
+  }
+});
+
+rs.on('data', chunk => {
+  console.log('data');
+  console.log({ chunk });
+});
