swift2 - Cannot invoke `join` with an argument list of type (String, [String]) in Swift 2.0 -

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var specializationtitles = ["a", "b", "c", "d"] let outputstring = join(" / ", specializationtitles)

got error:

cannot invoke join argument list of type (string, [string])

how solve this?

let separator = " / " let outputstring = separator.join(specializationtitles)

with xcode7beta6:

specializationtitles.joinwithstring(" / ")

with xcode7 release version:

specializationtitles.joinwithseparator(" / ")

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