Following are the important methods which you can use while playing with Iterator. A Scala iterator with elements of type A implements TraversableOnce[A], which is the argument type needed to concatenate collections with ++. Package structure . Method Definition: val result = iter.toSeq Return Type: It returns the stated collection as a sequence. This foreach function can be used to iterate … Scala List FAQ: How do I add elements to a Scala List?. edit close. Here, we used ita and itb to perform two different operations because iterator can be traversed only once. This ForEach function brings every item in the list one by one and performs the operations needed. Definition Classes A list is a collection which contains immutable data. Last Updated : 29 Jul, 2019; The iterator method is utilized to give an iterator. Scala Iterator toList() method with example. For instance, they provide a foreach method which executes a given procedure on each element returned by an iterator. For a complete list of methods available, please check official documentation of Scala. For example, on the JVM, String is an alias for java.lang.String. Example #1: You can use either it.size or it.length methods to find out the number of elements available in an iterator. Scala Standard Library 2.13.4 - scala.collection.Iterator. 28, May 19. Other aliases refer to classes provided by the underlying platform. If you need another collection type, just change List() to whatever you need (e.g., IndexedSeq() or collection.mutable.Seq() , etc. It is equivalent to the Seq method but this method is more faster.. Method Definition: def iterator: Iterator[A] Return Type: It returns a non-empty iterator for non-empty list and returns an empty iterator for empty list. Using foreach, the loop above could be abbreviated to: Therefore the expression 1.asInstanceOf[String] will throw a ClassCastException at runtime, while the expression List(1).asInstanceOf[List[String]] will not. Scala Iterator duplicate() method with example. This is actually a trick question, because you can't add elements to a Scala List; it's an immutable data structure, like a Java String.. Prepending elements to Scala Lists. Iterators in Scala also provide analogues of most of the methods that you find in the Traversable, Iterable and Seq classes. List represents linked list in Scala.A List is immutable, if we need to create a list that is constantly changing, the preferred approach is to use a ListBuffer. The two basic operations on an iterator it are next and hasNext.A call to it.next() will return the next element of the iterator and advance the state of the iterator. Sr.No Methods with Description; 1: def hasNext: Boolean. Iterators. play_arrow. 28, May 19. Notable packages include: scala.collection and its sub-packages contain Scala's collections framework. ... For example, List is an alias for scala.collection.immutable.List. Calling next again on the same iterator will then yield the element one beyond the one returned previously. The toSeq() method belongs to the concrete value member of the class Abstract Iterator. Example #1: filter_none. Scala Iterator hasDefiniteSize() method with example. Tests whether this iterator … This is the documentation for the Scala standard library. Scala Iterator Methods. The Scala List class holds a sequenced, linear list of items. Scala Iterator … 27, May 19. Cast the receiver object to be of type T0.. \>scalac Demo.scala \>scala Demo Output Maximum valued element 90 Minimum valued element 2 Find the Length of the Iterator. Scala Iterator buffered() method with example. Scala List iterator() method with example. Suppose we have a list over in Scala which we want to iterate over and do the general operations over all the elements, for this Scala came up with ForEach method. Note that the success of a cast at runtime is modulo Scala's erasure semantics. 27, May 19. 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