How do you get the index of an element in a list in Scala?

How do you get the index of an element in a list in Scala?

Finding the Index of an Element in a List with Scala

  1. Overview. In this short tutorial, we’re going to see how to find the index of an element in a List in Scala.
  2. Using indexOf and lastIndexOf. The first thing we need to take into account is that a list allows duplicated elements.
  3. Using indexWhere and lastIndexWhere.
  4. Finding All Indexes.
  5. Conclusion.

What is the index of a list?

The index() method returns an integer that represents the index of first match of specified element in the List. You can also provide start and end positions of the List, where the search has to happen in the list. Following is the syntax of index() function with start and end positions.

How do I access Scala list?

Scala List Example

  1. import scala.collection.immutable._
  2. object MainObject{
  3. def main(args:Array[String]){
  4. var list = List(1,8,5,6,9,58,23,15,4)
  5. var list2:List[Int] = List(1,8,5,6,9,58,23,15,4)
  6. println(list)
  7. println(list2)
  8. }

Is Scala a zero index?

Let’s first define an array in scala. Then you will modify a value at the 1st index since scala arrays are zero-indexed and see if you can update it.

Is it OK to use VAR in Scala?

Performance: Sometimes using a var gives you the best possible performance. When people say that everything can be done without vars, that is correct in the sense that Scala would still be turing complete without vars. However, it doesn’t change anything about the validity of the previous points.

What do you call objects with immutable state in Scala?

An object whose state cannot change after it has been constructed is called immutable (unchangable). The methods of an immutable object do not modify the state of the object. In Scala, all number types, strings, and tuples are immutable. The classes Point, Date, Student, and Card we defined above are all immutable.

Which class is top of Scala hierarchy?


What happens if we do not override hashcode () and equals () in HashMap?

You must override hashCode in every class that overrides equals. Failure to do so will result in a violation of the general contract for Object. hashCode, which will prevent your class from functioning properly in conjunction with all hash-based collections, including HashMap, HashSet, and Hashtable.

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