What is #:: method

Question

It might be a trivial question, but I am unable to find the documentation for it:

Inside Stream, and at other places I have seen examples using the method #::. For example:

val fibs: Stream[BigInt] = BigInt(0) #:: BigInt(1) #:: fibs.zip(fibs.tail).map { n => n._1 + n._2 }

But I dont find the documentation for implicit method #:: in the api. What is it? and where is it declared?

possible duplicate of [Searching the Scala documentation for #::](http://stackoverflow.com/questions/4553909/searching-the-scala-documentation-for) — om-nom-nom, Apr 23 '13 at 08:00
protip: use [symbolhound](http://symbolhound.com/) to lookup symbols like this — om-nom-nom, Apr 23 '13 at 08:00

score 2 · Accepted Answer · answered Apr 23 '13 at 06:26

2

First value member of in the Stream.ConsWrapper. I found by using the symbol index on the left pane under the search box.

Here is its signature:

def #::(hd: A): Stream[A]

In few words is the List :: but for streams.

answered Apr 23 '13 at 06:26

pedrofurla

But why is it hidden. It is so tough find it out – Jatin Apr 23 '13 at 06:33
Hidden is a bit hard. The problem is that left box in Scaladoc only shows the first level children. For that exact reason I made the reference index. I don't understand why ppl don't use it! – pedrofurla Apr 23 '13 at 06:48
Till now I assumed it to be starting character indexed search. Ideally, I would want Stream.consWrapper to be shown inside Stream api itself – Jatin Apr 23 '13 at 09:06

1 Answers1