chore: use array destructure with splite

Author: wangding

06-buffer/03-decode.js

@@ -7,17 +7,12 @@ if(process.argv.length !== 3) {
 
 // method A
 const buf = atob(process.argv[2]);
-const info = buf.split(':');
+const [userName, pwd] = buf.split(':');
 
 // method B
 /*
 const buf = Buffer.from(process.argv[2], 'base64');
-const info = buf.toString('utf8').split(':');
+const [userName, pwd] = buf.toString('utf8').split(':');
 */
 
-if(info.length !== 2) {
-  console.error('信息有误！');
-  process.exit(2);
-}
-
-console.log('user name: %s\npassword: %s', info[0], info[1]);
+console.log(`userName: ${userName}\npassword: ${pwd}`);

10-file-system/27-passwd-fp.js

@@ -3,14 +3,8 @@
 const fs  = require('fs');
 
 function line2obj(line) {
-  const arr = line.split(':');
-  return {
-    user_name: arr[0],
-    user_id: arr[2],
-    group_id: arr[3],
-    home_dir: arr[5],
-    login_shell: arr[6],
-  };
+  const [user_name,, user_id, group_id,, home_dir, login_shell] = line.split(':');
+  return {user_name, user_id, group_id, home_dir, login_shell};
 }
 
 let lines = fs.readFileSync('/etc/passwd', 'utf8');

10-file-system/27-passwd.js

@@ -6,15 +6,8 @@ const data = [];
 let lines = fs.readFileSync('/etc/passwd', 'utf8');
 lines = lines.split('\n');
 lines.forEach(line => {
-  const arr = line.split(':');
-  const obj = {
-    user_name: arr[0],
-    user_id: arr[2],
-    group_id: arr[3],
-    home_dir: arr[5],
-    login_shell: arr[6],
-  };
-  data.push(obj);
+  const [user_name,, user_id, group_id,, home_dir, login_shell] = line.split(':');
+  data.push({user_name, user_id, group_id, home_dir, login_shell});
 });
 
 console.table(data);

17-http-server/03-req-header-parse.js

@@ -15,14 +15,11 @@ http.createServer((req, res) =>{
 
   log('authorization:', req.headers.authorization);
 
-  let auth = req.headers.authorization;
+  const auth = req.headers.authorization;
 
   if(typeof auth !== 'undefined') {
-    auth = auth.split(' ');
-    if(auth[0] === 'Basic') {
-      let buf = Buffer.from(auth[1], 'base64');
-      log('username & password:', buf.toString('utf8'));
-    }
+    const [type, user] = auth.split(' ');
+    if(type === 'Basic') log('username:password:', atob(user));
   }
 
   res.end('OK!');