Explain Type Assertions in Go

Question

I'm reading about type assertions x.(T) in The Go Programming Language and don't understand them.

I understand that there are different scenarios:

• T is a concrete type or an interface
• One (asserted value?) or two (ok) values can be returned

This is what I don't understand:

• Why would I use them?
• What exactly do they return?

I have also googled on the topic and still don't understand.

Answer 1

Waitting for answers