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Mastering Exception Handling and Logging

Introduction

As developers, we know that writing error-free code is nearly impossible. Errors are inevitable, but it's how we handle them that defines the stability and robustness of our applications. This document dives deep into exception handling, best practices, and defensive programming strategies that ensure code resilience. Defensive programming isn't just about catching errors; it's an art of anticipating potential failures and ensuring your software behaves predictably in the face of problems. Effective error handling and meaningful logging are essential components of this mindset.

Exceptions Handling vs Error Handling

Errors represent serious problems that prevent the program from completing its task. In contrast, exceptions are conditions that interrupt the normal flow of the program but can often be handled. Both are types of runtime errors, which means they occur during the program's execution.

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With ❤️ Made in Nepal

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Javascript for QA Automation

1. An Introduction to JavaScript

JavaScript is an interpreted, powerful, versatile and beginner-friendly programming language that can add interactivity to a website, create servers, create games, etc.

This happens in games, in the behavior of responses when buttons are pressed or with data entry on forms; with dynamic styling; with animation, etc.

2. Fundamentals

2.1 Data Types and Variables

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Install CodeQL CLI from here

codeql database create project-ql --language=javascript
codeql pack download codeql/javascript-queries
codeql database analyze project-ql codeql/javascript-queries --format=sarifv2.1.0 --output=query-results.sarif --download
sudo pip install sarif-tools
sarif html -o venteur-ql-report/summary.html query-results.sarif

Now open the summary.html in your favorite browser

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@import url(https://cdn.jsdelivr.net/gh/tonsky/FiraCode@5.2/distr/fira_code.css);

.code-diff {
  font-family: 'Fira Code', monospace;
  font-weight: 500;
  line-height: 23px;
}

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Coding Assignment

Create a Restful API for CRUD application using expressJs framework and ReactJS with hooks that has following features.

• Logged in users can create, delete and update their article.
• Public user can read the article.

It should show the following implementation:

• Run in multi thread of CPU.
• Dockerize the api such that it can be run in services like fargate or kubernetes
• API should have unit tests

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Make sure you pulled all the commits in dev and staging branch

Approriately change if needed for master and staging.

git log origin/staging..origin/dev --oneline --no-merges

Press enter and grab all the result in clipboard

Fire up the console

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#!/usr/bin/osascript
tell application "iTerm2"
    tell current session of current tab of current window
        split vertically with default profile
        split vertically with default profile
        write text "cd ~/projects/myFavProject"
        write text "code ."
    end tell
    tell second session of current tab of current window
        write text "cd ~/projects/myFavProject"

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A temporary workaround to remove the banner.

• Fire up console. Right click-> click Inspect element-> Click console tab
• Paste following

setInterval(()=> {
  let banner = document.getElementById('showroom');
  banner.remove();
},2000);

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function getColumnIndices(total) {
	let indices = [];
	//7 because number of column is 7
	for (let index = 0; index < total; index += 7) {
		indices.push(index);
	}
	return indices;
}
const allColumns = document.getElementsByClassName('rt-td');
const indices = getColumnIndices(allColumns.length);