Are double “” and single '' quotes (always) interchangeable in R?

Question

This is perhaps rather a minor question...

but just a moment ago I was looking through some code I had written and noticed that I tend to just use =\"something

Answer 1

> print(""hi"")
Error: unexpected symbol in "print(""hi"
> print("'hi'")
[1] "'hi'"
> print("hi")
[1] "hi"