May 10, 2019
In a previous post, we saw how we could host an ASP.NET Core application behind Nginx. We saw that Kestrel works as a selfhost webserver and that in order to get request forwarded to it, we need to proxy them using the location and proxy_pass directives. Today we will look into some details regarding path handling, ensuring that our requests are forwarded properly.
May 03, 2019
When building single page applications, like Angular applications, where the entire application is sent over HTTP, compressing static files before serving them can provide a major boost in performance, drastically reducing latency. One of the most common compression algorithm widely supported by reverse proxies and browsers is Gzip. Today we will see how we can enable gzip compression on Nginx.
Apr 26, 2019
Angular CLI provides an easy way to host Angular applications during development by using Webpack dev server. Due to the fact that Webpack dev server is a web server, our frontend gets hosted on a separate web server which causes CORS issues if we want to call endpoints on a backend which we also host locally for development. Today we will see how we can use one of the features of Webpack dev server to setup a proxy during development which will proxy calls from the Angular application to our local backend hence by passing the CORS issue.
Apr 19, 2019
In our previous post on mutability, we discussed the fact that time was to be taken into consideration when mutability was involved. We observed objects lifetime as instant by instant, computing and assigning objects states for each instant. Another way to look at time is to consider the state as a discrete set of values. From this perspective, we can see the time as being an infinite sequence, a stream, and the state can also be seen as a stream computed out of time.
Apr 12, 2019
PowerShell is versatile command line shell which comes with a powerful scripting language. It is now even more available than before with the new PowerShell Core which makes it available on Linux. Even though the main commands in the scripting language have been around for ages, I always see myself having to re-learn how to use it every time I need to write a script.
Apr 05, 2019
Mutability is a topic of high interest in the view of developers adventuring themselves in functional programming languages where it is generally unwelcomed and, in some instances, made voluntarily hard to implement. In contrast, object oriented programming has assignment at its core. Objects are represented as entity with a state modifiable over the lifetime of the application.
Mar 29, 2019
Data abstraction allows us to think about complex systems in term of their properties rather than their implementations. Reasoning in term of properties provides a ground of assumptions which can be used to create new systems. In common programming languages, abstraction is present everywhere, as interfaces, as abstract and regular classes, as functions, as function signatures, as user interfaces, etc. All of theses tools provide a way to build layers of abstraction which we can work on top of to create new functionalities by manipulating data on the appropriate layer.
Mar 22, 2019
Progressive Web App allows an Angular website to be installed locally and be available on the app drawer and on the home screen of a phone. Today we will see how to use Angular Progressive Web App module to transform our app into a mobile app.
Mar 15, 2019
Few weeks ago we saw how to configure CloudWatch to monitor upstream response time from logs. We create a CloudWatch configuration which allowed us to create metrics by parsing the logs and create a dashboard out of it. Building up from there, today we will see how we can monitor disk used space and trigger an alarm when the remaining disk space is critical.
Mar 06, 2019
Floyd’s Tortoise and Hare is a cycle detection algorithm operating on a linked list. The algorithm is based on two pointers, the tortoise and the hare, moving on the linked list at a different speed. The algorithm can be used to find cycle existence, deduces the beginning of the cycle, and the length of a cycle. Today we will explore the mathematical proof behind the algorithm and we will implement it in Racket.
Mar 01, 2019
Working with trees is an interesting task. Today we will look into the Basket of Apples problem, which can be solved using a tree structure. This deep dive will allow us to explore how we can reason around trees and understand concepts allowing us to vocalize ideas.
Feb 22, 2019
Last week, we briefly looked into the Y Combinator also known as fixed-point combinator. Today we will explore more on the territory of fixed-points by looking at what a fixed-point is, and how it can be utilized with the Newton’s Method to define an implementation of a square root procedure.
Feb 14, 2019
Recursion refers to the property of a function to be defined in term of itself. The Fibonacci sequence is a great example of a recursive problem where a Fibonacci number is calculated from a combination of precedent Fibonacci numbers. Recursion can be implemented in many forms, it is even possible to implement recursion without explicit self calling. Today we will look at different implementations of Fibonacci and discover their properties.
Feb 06, 2019
In programming, we often hear about Closures. Closures are present in any languages possessing functions as first class citizen. This includes functional languages and also widespread languages such as C#, Python and JavaScript. Today we will look at the origin of closures and understand what they are.
Jan 30, 2019
Last week a colleague of mine introduced me to the concept of continuation in Racket (the best of Scheme and Lisp - at least that is what racket-lang.org states). I knew about the existence of Lisp but I never really paid attention to what it provided as language features. So I took the bite and started to read the post shared to me on continuations, written by Matt Might and oh boy… was I confused. Everything about the code confused me, the notation, the syntax, and of course the flow of the program itself. What I understood was that this piece was implementing Exceptions by using continuations which was enough to make me want to understand it.
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