In this story, we will explore the variable types you can use when you develop a smart contract in Solidity. We will a smart contract in a new workspace Solidity-Playground: The uint8 type In first, let’s see the variable type uint8. For that, let’s create a basic smart contract. Because I’m lazy, I…

The design of smart contracts is very sensitive. There must be no vulnerabilities. Security audits are of course the first tool to mitigate the risks. Generating documentation to visualize the control flow of the functions can also help to highlight possible vulnerabilities. The solgraph (https://www.npmjs.com/package/solgraph) the tool automatically generates a…

In this story, we will analyze how to create an Ethereum address. For this, we will use NodeJS and the ethers package (https://docs.ethers.io/v5/). What is an Ethereum address used for? It is used to : Receive and send crypto-currency, Sign and send transactions, Connect to DApp. If we make a…

Decentralization is at the heart of blockchains. However, there is a real danger. And that, the French company Humble Luck Ball has understood it very well and brings a solution. In this story, I present you the Humble Luck Ball project and its token LBC (Luck Ball Coin). Humble Luck…

In this story, we will see how to test a Kubernetes deployment and service. For that, we will use TerraTest. Create the deployment and service manifests Now, we will create the deployment and the service that we want to test. In first, let’s create a deployment manifest deploy.yaml: --- apiVersion: apps/v1 kind: Deployment metadata: name: nginx-deploy spec: selector…

In this story, we will see how to test a Docker image. We will create a file in the Docker image and we will check this file exists and has the expected content. For that, we will use TerraTest. This example is based on the official example of the TerraTest…

Katacoda is a great solution for teams to learn and improve their skills by providing environments based on an interactive browser where they can do experiments without fear: they can break everything, it doesn’t matter. In this story, I will introduce this service and how to create your own scenario. …

A Gameday simulates a failure to test systems, processes and team responses in a real-life situation. In this story I will introduce the principles of a Gameday and explain how a Gameday ceremony is organized. Principles of Gameday The goal is for the team to practice how to react the day an exceptional…