Scala syntax for iteration? Or something else?

Question

I saw some code like this. From REPL test, it looks like "/:" iterates through chars and call incr repeatedly. But I can't find any document for this syntax. What does /: syntax mean here?

val chars = List('a','b')
def incr(acc:Map[Char, Int], c:Char) = {
   val count = (acc get c).getOrElse(0) + 1
    acc + ((c, count))
}

(Map[Char,Int]() /: chars)(incr)

check the scaladoc for Map ;) scala-lang.org/api/current/index.html#scala.collection.Map@/… — jopasserat
– jopasserat, Commented Sep 3, 2016 at 18:16
It's just a method call like any other method call. It's not special syntax. Very few things in Scala are, in fact. — Jörg W Mittag
– Jörg W Mittag, Commented Sep 4, 2016 at 13:16

user3248346 · Accepted Answer · 2016-09-03 19:21:54Z

1

From the documentation:

   *  Note: `/:` is alternate syntax for `foldLeft`; `z /: xs` is the same as
   *  `xs foldLeft z`

answered Sep 3, 2016 at 19:21

user3248346

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