Paneque's Technology Blog

We need to talk about it How open is .NET Core and C#? How does it compare to a platform like Java? Well... let's see. Disclaimer: The post is a resumed version with lots of links, so be prepared to read it in a DFS or BFS way :)  .NET Core In November 2014, The Microsoft team announced that " NET Core is Open Source " Included C# and Visual Basic compilers Visual F#   ASP.NET Core Entity Framework Core NET Core Framework   In 2015, Microsoft releases Visual Studio Code , a cross-platform multi-language IDE.  All these released under an Open Source license. The MIT License . NET Core runs in Windows, Linux, Mac and ARM-based systems (IoT) Docker support existing Java Originally made open source by Sun in 2006 Released under GPLv2 CE license . The CE clause allows it to be used in a more restrictive scenario.  Oracle has a different licensing schema for "Enterprise Java". While the OpenJDK is still safe (and should remain so) Ente...

A few weeks ago, I was solving a problem at HackerRank and after completing a solution that ran  under 100 milliseconds, the program would still timeout during execution. HackerRank limit is usually 1 second, so something was taking more than 900ms. It was the strings! Yes, we know handling strings is costly, but this time there was no way around it.  At the final stage of the problem I had to construct a string over 200k chars long from an array of Boolean values that represented the bits of the number.   Disclaimer : Strings are slow, mainly because they are immutable. Concatenating two strings, creates a third one and possibly 2 for the garbage collector to pickup. Looking through the code I noticed I was simply using " += " instead of StringBuilder.Append method. After using StringBuilder the solution was faster and the submission was approved. It was  fast now, but it got me thinking "how much faster indeed?" which ended with me measuring t...