CODEWITHSUNDEEP
scalasyntactic-sugar
Jesse
Jesse

Reputation: 489

How does :_* convert ordered collections into variable arg lists?

I have been using :_* to convert Seq[String] to String* and I realized that I do not understand how this works under the hood.

Is there a simple way to think about this?

Upvotes: 6

Views: 147

Answers (1)

Rex Kerr
Rex Kerr

Reputation: 167891

Under the hood, String* is passed as a Seq[String]. It's all just syntactic sugar:

def blah(ss: String*) = {...}
blah("Hi","there")

is turned into

def blah(ss: Seq[String]) = {...}
blah(Seq("Hi", "there"))

and :_* just means "hold the sugar, I've already got what you need--a Seq!"

Upvotes: 7

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