Scala: join an iterable of strings

Question

How do I \"join\" an iterable of strings by another string in Scala?

val thestrings = Array(\"a\",\"b\",\"c\")
val joined = ???
println(joined)

Answer 1

How about mkString ?

theStrings.mkString(",")

A variant exists in which you can specify a prefix and suffix too.

See here for an implementation using foldLeft, which is much more verbose, but perhaps worth looking at for education's sake.