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Covariance And Contravariance

Dec 13th, 2019

In programming languages supporting generic types, we sometimes come accross the terms Covariance and Contravariance. Those two terms describe how generic type paramters act and how they can be assigned. In today’s post, we will look at their definition together with examples.

DotNetCore CSharp

Sqlite Litecli

Dec 6th, 2019

SQLite comes built in with a command line tool allowing us to execute all sorts of database commands (DDL/DML) but also special dot commands allowing us to list the tables or check the schemas. Being low level by nature, it provides opportunities for application to be built on top of. LiteCLI is an example of a friendly CLI for SQLite. Today we will look at the feature that LiteCLI provides making it a great companion for your SQLite application.


Setup Prettier For Typescript

Nov 29th, 2019

One thing making developers life easier is automatic code formatters. Prettier is one of the most famous code formatter, for most part it does what you would expect it to do and most of the time it formats code in a better way you would yourself do. But on top of making your life easier by formatting your own code, it can be used to enforce a convention in term of code formatting accross your team. One of the language supported is Typescript as we will see today.


Aws Ip Range Cidr

Nov 22nd, 2019

AWS EC2 security groups rules allow us to give access to EC2 instances on certain ports and certain IP addresses. While ports and address are easy to setup, the rules also support CIDR notation which provides a way to specify a rule for a range of addresses. Today we will see how CIDR notation works and how we can use it do define IP ranges.


Zsh Plugins

Nov 15th, 2019

Last week we looked into how we could install iTerm2 combined with Oh My Zsh to create the best possible terminal experience. Today we’ll have a look at the plugins that we can install to make our terminal even more powerful!

Oh My Zsh

Iterm2 With Oh My Zsh

Nov 8th, 2019

Few years ago I wrote a post about ConEmu, a better shell experience for Windows. I have been using it over the past four years while working on Windows. Recently I completely moved to Mac and on unix system we have better shell experience in general. Today we will see how we can setup iTerm2, with zsh and Oh My Zsh providing a way superior shell experience than ConEmu on Windows or even than the regular terminal.

Oh My Zsh

Feature Reducer With Ngrx

Nov 1st, 2019

Just like how Angular components, ngrx stores can also be separated into different modules. This has the benefits of reducing the complexity of a system by having dedicated modules with dedicated reducers, actions and effects. Today we will see how to define ngrx reducers, effects and actions for feature modules.


Serialization With Marshmallow

Oct 25th, 2019

Marshmallow is a library converting different datatypes to Python objects. The most common usage of Marshmallow is to deserialize JSON object to Python object or serialize Python object to JSON object to be used in web API. Marshmallow does this through the definition of a schema which can be used to apply rules to validate the data being deserialized or change the way data are being serialized. Today we will look into more details on how to use Marshmallow, how to apply validation on fields and how to configure


Get Started With Alembic

Oct 18th, 2019

In a previous post, I covered Flyway, a database migration tool which allows us to apply incremental migration to an existing database or build the new database from scratch. In the same line, Alembic is a migration tools which uses SQLAlchemy underneath, ideal when our application itself is in Python. Today we will look at how to setup Alembic and create migrations.


Splunk Commands

Oct 11th, 2019

Last week we saw the different ways to plot charts and tables in Splunk. We saw how eval and bin could be used to manipulate logs in order to plot useful charts. Continuing in the same line, today we will be looking at more useful commands used to join different event results, group events and identify events.


Splunk Charts And Tables

Oct 4th, 2019

Splunk is a log aggregator in the same way as elastic search with Kibana can be used. When I started using Splunk I immediately acknowledged its capabilities, and its usage was largely limited by my own knowledge of writing queries (which is still very low). But every now and then I would see myself in a situation where I would need to compose the same query which I did the week before but now have forgotten how to. So today we’ll explore some nice Splunk functionalities.


From Git Ui To Cli

Sep 27th, 2019
Create Branch

As a developer I use Git every day. I used to use GitExtension which is nice but at time it was really annoying, for example popups showing out of viewport, impossible to click, or random lags when fetching commits. I had been using GitExtension for at least 5 years while working on Windows, but today I am switching to a Mac where GitExtension isn’t supported. I started to look at alternatives and found some, like Fork, a nice software but similarly to GitExtension with random lags, very frustrating. This exercise highlighted to me a bigger issue; Had I been using Git command line all along, I wouldn’t have been wasting my time looking for alternative. So today I am going through some Git commands which are useful in day to day operation, and that helped me transition from a UI driven Git user to a CLI driven.


Bootstrap With Primeng Badge List Component

Sep 20th, 2019
Badge List Demo

A badge list is common component on a website allowing to display a list of items, usually one word items. Those badges can be clickable which can then be used for filtering or even navigation. When a screen space is available, those badges can be simply displayed inlined but when screen space is reduced, mobile screens are a good example, having a list of badges can potentially take up 30% of the screen.

Bootstrap PrimeNG Angular

Client Side Validation Angular

Sep 13th, 2019
Angular Form Validation

Two years ago we looked into Angular Reactive Forms Part 1 and Part 2, explored different ways of adding controls and binding the values of the controls to a reactive form using standard HTML controls and PrimeNG controls. But we left aside another important part of the creation of a form, the validation. There are two types of validation, a server side validation which hits the server to execute some hosted logic, and a client side, inline, validation which can be used to directly validate simple constraints directly on the frontend. In today’s post we will look at how we can implement a nice inline validation for our reactive forms in Angular.


Frontend E2e Testing With Cypress

Sep 6th, 2019
Cypress console

Cypress is a frontend testing tool which can be used to write unit test and end to end (e2e) tests. It comes packed with features that make it easy to write tests, execute them and trace back failures. Today we’ll look at how we can setup Cypress and write e2e tests for a SPA application.

JavaScript Cypress
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