Rx Subject Vs GoF Subject

Question

How the Rx Subject and the Subject in GandOfFour Observer pattern are different?

Answer 1

There's some overlap:

• GoF Subject: Subscribe handler, unsubscribe handler, send notification to handlers

• Rx Observable: Subscribe handler of type T, (implicitly unsubscribe via subscription disposable)

• Rx Observer: Handler that receives notification of type T (or error, or end)
• Rx Subject: Observable + Observer for some type T

So they support the same basic operations. I would assume Rx Team chose their name based on GoF usage. Rx Team though clearly wanted to split the functions of 'Subject' into sender and receiver: The emphasis in Rx is observables, not subjects.