CODEWITHSUNDEEP
scala
Frank
Frank

Reputation: 4417

How does Array.toList work in Scala?

I'm looking at this snippet: 

val here: Array[Int] = rdd.collect()
println(here.toList)

... looking at the source for toList (on TraversableOnce) and Array (Array does not inherit TraversableOnce though), but I can't find the connection that will make Scala consider an Array as a TraversableOnce - if that is even what happens. Is there some implicit at work here? Is there a conversion via ArraySeq or WrappedArray? How does that toList work?

Upvotes: 2

Views: 760

Answers (1)

Tim
Tim

Reputation: 3725

Array does not extend TraversableOnce, but it is implicitly convertible to IndexedSeq, which does!

This means that internally, the array is converted to a WrappedArray, then toList is called on this.

See here for more info: http://www.scala-lang.org/docu/files/collections-api/collections_38.html

Upvotes: 4

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