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System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

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int doubler(int x) {
  return 2 * x;
}

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Every line of code we write today will end up as someone’s legacy code.

Everything that you write is going to disappears some day

RUM Code coverage, chose a 1h timeframe (per day) where 1% traffic run that the test

JS coverage

FES javascript instrimentation visualization

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node: Platform built on V8 to build network applications
git: Distributed revision control system
wget: Internet file retriever
yarn: JavaScript package manager
python3: Interpreted, interactive, object-oriented programming language
coreutils: GNU File, Shell, and Text utilities
pkg-config: Manage compile and link flags for libraries
chromedriver: Tool for automated testing of webapps across many browsers
awscli: Official Amazon AWS command-line interface
automake: Tool for generating GNU Standards-compliant Makefiles

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<?php

/**
 * Enable shortcodes in widgets
 */

add_filter('widget_text', 'do_shortcode');


/**

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Features and Step Definitions

Gherkin Keywords

• Feature
• Background
• Scenario
• Given
• When
• Then
• And

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Six Sigma - Introduction

Six Sigma is a highly disciplined process that helps us focus on developing and delivering near-perfect products and services.

Features of Six Sigma

• Six Sigma's aim is to eliminate waste and inefficiency, thereby increasing customer satisfaction by delivering what the customer is expecting.
• Six Sigma follows a structured methodology, and has defined roles for the participants.
• Six Sigma is a data driven methodology, and requires accurate data collection for the processes being analyzed.
• Six Sigma is about putting results on Financial Statements.

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Software Testing - Overview

What is Testing?

Testing is the process of evaluating a system or its component(s) with the intent to find whether it satisfies the specified requirements or not. In simple words, testing is executing a system in order to identify any gaps, errors, or missing requirements in contrary to the actual requirements.

According to ANSI/IEEE 1059 standard, Testing can be defined as - A process of analyzing a software item to detect the differences between existing and required conditions (that is defects/errors/bugs) and to evaluate the features of the software item.

Who does Testing?

It depends on the process and the associated stakeholders of the project(s). In the IT industry, large companies have a team with responsibilities to evaluate the developed software in context of the given requirements. Moreover, developers also conduct testing which is called Unit Testing. In most cases, the following professionals are involved in testing a system within their respective capa

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System Analysis and Design - Overview

Systems development is systematic process which includes phases such as planning, analysis, design, deployment, and maintenance. Here, in this tutorial, we will primarily focus on:

• Systems analysis
• Systems design

Systems Analysis

It is a process of collecting and interpreting facts, identifying the problems, and decomposition of a system into its components.

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Learn Behavior Driven Development