Combinator /: in scala

Question

What is the meaning of this combinator in scala? /:

I've found it in several examples:

override def toString(): String = {
    ("" /: cfg) ((str: String, b: BasicBlock) => str + "Block " + b.id)
  }

or

val successorIns = b.getSuccessors().map(in(_))
val newValue = (top() /: successorIns) (meet(_, _))

Answer 1

It is shorthand for foldLeft. You can see the definition of it here.