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a)

Dòng 5: Khai báo trùng biến i

Dòng 6: Thiếu dấu ; sau while (i <= n)

Dòng 16: Thiếu dấu ; sau i++

Dòng 18: Sai index {1}, {2} => {0}, {1}

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// Module using the Module Design Pattern
var Module = (function() {
  // Private variable
  var privateVariable = "I am a private variable";

  // Private function
  var privateFunction = function privateFunction() {
    console.log("This is a private function");
  }

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#!/bin/bash

yum update -y
yum install -y httpd
systemctl start httpd
systemctl enable httpd

TOKEN=$(curl -X PUT "http://169.254.169.254/latest/api/token" -H "X-aws-ec2-metadata-token-ttl-seconds: 21600")
EC2_AZ=$(curl -H "X-aws-ec2-metadata-token: $TOKEN" http://169.254.169.254/latest/meta-data/placement/availability-zone)

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Q1:

• This calculator takes values that could be written in a browsers route path as a single string. It then returns the result as a number (or an error message).

• Route paths use the '/' symbol so this can't be in our calculator. Instead we are using the '$' symbol as our divide operator.

• You will be passed a string of any length containing numbers and operators:

  • '+' = add
  • '-' = subtract

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/**
 * It takes a function as an argument, and returns a function that will call the original function, and
 * if it throws an error, it will call the next function in the middleware chain
 * @param req - The request object
 * @param res - The response object
 * @param next - The next function in the middleware chain.
 * @returns A function that takes a function as an argument and returns the result of that function.
 */
const wrapper = (req, res, next) => async (func) => {
	try {

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We prefer to have audit logging in our services that leverage databases. It gives us clarity into sources of where ACL issues might originate as well as gives us a general timeline of activity in our application.

Audit logging is tedious to set up so this gist contains our latest iteration of audit logging support for a sequelize based service.

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const db = EXAMPLE_DB;
const expand = "group.permissions.entities.nestedEntities.slug(searchValue)" 

const buildAssocOptions = (str) => {
	return str
		.split('.')
		.reverse()
		.reduce((acc, val, index, arr) => {
			let currentObj = {
				model:

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'use strict';

const crypto = require('crypto');

const ENCRYPTION_KEY = process.env.ENCRYPTION_KEY; // Must be 256 bits (32 characters)
const IV_LENGTH = 16; // For AES, this is always 16

function encrypt(text) {
 let iv = crypto.randomBytes(IV_LENGTH);
 let cipher = crypto.createCipheriv('aes-256-cbc', Buffer.from(ENCRYPTION_KEY), iv);

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// Examples of Dependency Injection

// Example 1
class LoggerConstructorInjection {
	constructor(config) {
		this.config = config;
	}

	getConfig() {
		return this.config;

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user www-data;                                                                                                                                                                                                                                                       
pid /run/nginx.pid;

worker_processes auto;
worker_rlimit_nofile 65535;

include /etc/nginx/modules-enabled/*.conf;

events {
  worker_connections 65535;