modify/add console code

Author: wangding

03-console/01-format.js

@@ -23,9 +23,12 @@ log(`qq: ${user.qq}`);        // 输出方式四：模板字符串输出
 
 console.dir(user);
 console.dir([user, user]);
+console.dir({o: {b: {j: user}}});
+console.dir({o: {b: {j: user}}}, {depth: null});
 
 console.table(user);
 console.table([user, user, user]);
-console.table([user, user, user], ['name']);
+console.table([user, user, user], ['name', 'qq']);
+// console.table 最适合打印数据库的查询数据，因为查询结果就是表格
 
 console.error('Error! something wrong!');

03-console/03-menu.js

@@ -0,0 +1,16 @@
+#!/usr/bin/env node
+
+function menu() {
+  const tab = ' '.repeat(10);
+  const msg = `${tab} [1] 加法运算\n` +
+              `${tab} [2] 减法运算\n` +
+              `${tab} [3] 乘法运算\n` +
+              `${tab} [4] 除法运算\n` +
+              '\n' +
+              `${tab} 请输入您的选项：`;
+
+  console.clear();
+  console.log(msg);
+}
+
+menu();

03-console/03-assert.js 03-console/04-assert.js03-console/03-assert.js renamed to 03-console/04-assert.js

@@ -0,0 +1,21 @@
+#!/usr/bin/env node
+
+const fs = require('fs'),
+      { Console } = console;
+
+const method = process.argv[2];
+
+let logger;
+
+if(method === 'stdout') {
+  logger = console.log;
+} else if(method === 'file') {
+  const output = fs.createWriteStream('./stdout.log');
+  logger = new Console({ stdout: output });
+  logger = logger.log;
+} else {
+  console.log('usage: cmd stdout|file');
+  process.exit();
+}
+
+logger('hello world');