essentially Weakmaps are a collection of keys and values with the main constraint being the key has to be an object. 

If you're writing the next big application, with a stunning UI and a great workflow, I humbly ask you to consider accessibility as part of the equation.  

We are very pleased to announce the launch of our Open Source project - Fast Report Open Source.
We are hoping to develop a friendly community of .Net Core developers who will share our eagerness to create fast, powerful and convenient reporting tool for Windows, Windows Server, Linux and MacOS.
We also encourage you to be a part of the global reporting team! Join us on GitHub: github.com/FastReports/FastReport 

In addition to Windows 10, WinJS 4.0 supports the latest versions of all your favorite browsers, including the new Microsoft Edge. We realize that many developers are more familiar with, and may prefer to use, other frameworks for various parts of their app. We have checked in wrappers for AngularJS, KnockoutJS, and ReactJS to our GitHub project. You can now create Windows or web applications using other web frameworks, while still having access to the rich set of controls that WinJS provides.

PowerShell For SQL Full Course
f you’re a SQL Data Pro, check out this demo-packed course to explore using PowerShell to manage SQL Server and Azure SQL Database. Hear about the background of PowerShell, and learn PowerShell basics, such as how to get help, use cmdlets, and load modules. Look at task automation and configuration, and learn how to provision, deploy, and manage SQL Server in Azure Virtual Machines and Azure SQL Database. Plus, see how to use the SQLPS module to administer SQL Server, both on-premises and in Azure Virtual Machines. Don’t miss this practical PowerShell training 

As a C# developer—even with a great, active C# community—you may sometimes find yourself a little bit jealous. What if we could bring the JavaScript language and ecosystem also into the C# world? What if a C# developer could use JavaScript inside C#? Fret not! I’m thrilled to announce a new WinRT project I’ve created—ChakraBridge— which will allow you to get invited to the party like any web developers.

ASP.NET Core provides better support for clean, testable, maintainable architectures than any of its predecessors. Learn the underlying principles that apply to project/solution organization, how best to arrange your projects to support clean code, and how to refactor existing solutions toward this architecture. Examples will use ASP.NET Core but the principles covered apply to all languages and platforms.  

This is a practical guide for implementing Domain Driven Design (DDD). While the implementation details are based on the ABP Framework infrastructure, the basic concepts, principles and models can be applied to any solution, even if it is not a .NET solution.