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DRY

Below are two functions which are both syntactically and semantically correct. The first one violates the famous software development principle, DRY (Don't Repeat Yourself) and the second function fixes it. The programming language used here is Javascript.

function validateObject(exampleObject){ //Violates DRY
    const errorMessages = [];
    if(!exampleObject["color"]){
        errorMessages.push("Error! Please enter a value into the color field");
    }

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Section B

Q1. Simple "Hello World" Smart Contract

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.7.0 <0.9.0;

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MySQL Cheat Sheet

Help with SQL commands to interact with a MySQL database

MySQL Locations

• Mac /usr/local/mysql/bin
• Windows /Program Files/MySQL/MySQL version/bin
• Xampp /xampp/mysql/bin

Add mysql to your PATH

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1. Voting

To quickly know the result of a given referendum question, we query the votes table, filtering by the referenda_questions id.

As we never expect to query a single voter's voting record, we convert the user's base data into a hashed value before storing in the database, thereby protecting the base information of the user. The user(voter) information is not normalized in this scenario. For the purpose of authenticity, we still need to preserve a table of voters to ensure that only registered voters can vote. An alternative would be storing the voter_hash directly in the votes table.

2. Rewriting history with git

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Conventional Commit Messages

See how a minor change to your commit message style can make a difference. Examples

Have a look at CLI util git-conventional-commits to ensure this conventions and generate changelogs

Commit Formats

Default

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#!/bin/bash

while read oldrev newrev ref
do
  branch=`echo $ref | cut -d/ -f3`

  if [ "master" == "$branch" ]; then
    git --work-tree=./path/under/root/dir/live-site/ checkout -f $branch
    echo 'Changes pushed live.'
 fi

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import React, { useState } from "react";
import { Redirect } from "react-router-dom";
import { Row, Col, Form, Button, Table, Card } from "react-bootstrap";
import { LoopCircleLoading } from "react-loadingg";
import { usePaystackPayment } from "react-paystack";

import { referralSettlement, sendData } from "../services/httpService";

import { getTransactionDetails, configurePaymentGateway } from "../helpers";
import { getTransactionReferenceCode, isPortedMtnNumber } from "../utils";

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Faker API test

/**
 * 1. Using Fetch API with Browser
 */
function makeApiCalls(){
    return (async () => {
        try{

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CI/CD Pipeline Set-up steps

Create IAM Role and Service Role for AWS CodeDeploy

Create a service role with the following access:

• AmazonEC2RoleForAWSCodeDeploy - IAM Role, grants CodeDeploy access to S3 bucket
• AWSCodeDeployRole - Service Role, Grants CodeDeploy access to EC2

Confirm Trust Relationships of the created Role matches below

{

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Typescript Nodejs API Setup

It is recommended to make use of Yarn in place of NPN where possible.

Initialize the project

yarn init -y

Install Typescript globally if not already installed, or install on the project using the -D or --save-dev flag