Today we’re happy to announce the availability of the release candidate (RC) of TypeScript 3.1. Our intent with the RC is to gather any and all feedback so that we can ensure our final release is as pleasant as possible. 

Symbol support
We’ve added support for the Symbol type added in ES6/ES2015. Essentially, this means that jQuery objects can be iterated with for-of where supported.

for (element of $elements) {
    console.log(element);
}

• .NET Core is the future of .NET: If you’ve already started working with .NET Core, that’s great! If you’re starting a new project, you should consider .NET Core.
• .NET Framework will continue to be supported: If you have any existing applications on .NET Framework (Windows-only), you can keep those on .NET Framework.
• .NET Releases will become more predictable: Starting with .NET 5.0, there will be 1 major release every year,  after which each even-numbered release (6.0, 8.0, etc) will come with LTS (Long-Term Support). 

Have you ever discussed remote work with someone who has never worked remotely? How did it go? If they were like most people, it probably didn’t go all that well. It can be difficult for people to understand how someone could work from home, be productive, and end up being a normal human being at the end of the day.  

Immutability comes with a lot of benefits, but sometimes it can be a bit cumbersome to deal with when you only want to update some properties. Since the object is immutable, you need to create a copy with all the existing values and the new updated one.

I will show you how Records in C# 9 will greatly simplify this

• We have two new refactorings for global usings, Extract Global Using and Inline Global Using, with Find Usages support for this feature.
• For nullable reference types, we’ve split the “should never be null” warning into two categories: one for those who look at NRT annotation and one for those who have a runtime check for null. We’ve also added a setting to enable runtime enforced not null warnings only, and supported [MemberNotNull] and [MemberNotNullWhen] annotations.
• We’ve implemented generic attributes support for C#11. 

Using GitHub can be a little intimidating, but it's a better approach for source control. Today, I provide a collection of links to get you started with GitHub to help you understand it better. 

• VS is more responsive when running Git operations.
• Debugging large solutions with /debug:fastlink PDBs is more robust. Changes in the PDB/DIA lead to reduced latency and a 30% reduction in heap memory consumption in the VS debugger that used to cause crashes.
• C++ compiler bugfixes:
  • Fix for the SSA optimizer incorrectly sinking a function call past a store to a variable used in a __finally handler.
  • Fix for the SSA optimizer sometimes incorrectly analyzing memory loads from locations with negative offsets.
  • Fix for the optimizer incorrectly transforming a pre-incremented loop into a post-incremented loop. This was found compiling the ICU project.
• Microsoft bumped up the Java™ Development Kit 8 to Update 172 (JDK version 8u172).