[+] def ++ ( xs: IterableOnce [ B ] ) : Iterator [ B ]

[+] def drop ( n: Int ) : Iterator [ A ]

[+] def filter ( p: A => Boolean ) : Iterator [ A ]

[+] def flatMap ( f: A => IterableOnce [ B ] ) : Iterator [ B ]

[+] def foldLeft ( z: B ) ( op: (B, A) => B ) : B

[+] def foldRight ( z: B ) ( op: (A, B) => B ) : B

[+] def foreach ( f: A => Unit ) : Unit

[+] def hasNext : Boolean

[+] def indexWhere ( p: A => Boolean ) : Int

[+] def iterator : Iterator [ A ]

[+] def map ( f: A => B ) : Iterator [ B ]

[+] def next ( ) : A

[+] def zip ( that: IterableOnce [ B ] ) : Iterator [ ( A, B ) ]