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Comment by stochastic_monk | Hacker News Reader

The same reason everyone has a deep learning platform. It’s about developer mindshare and industry dominance rather than honestly thinking they’ll make a better framework starting from scratch rather than improving someone else’s.

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Also the same reason everyone has a VM, programming language, back end framework or front end framework.

Apple: LLVM (I know I’m stretching the definition here :) ); Objective-C, Swift; N/A; Cocoa.

Microsoft: .NET CLR; Visual Basic, C#, F#; ASP.NET; N/A.

Facebook: HHVM; Hack; N/A; React.

Google: Go, Dart; Golang, Dartlang; GWT, Guava; Angular; Android, Flutter.

Oracle: JVM; Java; APEX; N/A.

It seems that for some reason just Amazon doesn’t want to play :)

Apple actually sort of does have a backend framework: WebObjects. They just seem to have deprecated it in favor of other solutions. Still, I've noticed at least iTunes Connect is still using it. And for what it's worth, Swift is going to have more server related stuff coming to the standard library (https://swift.org/server-apis/), and I wouldn't be surprised if Apple starts adopting this eventually as well as it continues to improve.

I'd add ReasonML to the Facebook list - one of the most promising general purpose languages out there, IMO.

You could add Folly as Facebook's backend C++ framework (it's somewhat analogous to Google's Guava for Java).

Missing some front end frameworks:

Microsoft: WPF, Blazor Oracle: JavaFX

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