If you’re interested in the Scala
zipWithIndex methods, here are a few examples.
I’ve known about using Scala’s
zipWithIndex method for quite some time. I used it in
for loops to replace counters, and it works like this:
scala> List("a", "b", "c").zipWithIndex res0: List[(String, Int)] = List((a,0), (b,1), (c,2))
I learned about using
Stream last night while reading Joshua Suereth’s book, Scala In Depth. It works like this:
scala> List("a", "b", "c") zip (Stream from 1) res1: List[(String, Int)] = List((a,1), (b,2), (c,3))
Both of these approaches are cool.
For more information on using these methods with a for loop, see my tutorial, How to use zipWithIndex or zip to create for loop counters.
Scala 3 Update: The Scala 3
Streamclass is deprecated, and has been replaced by the Scala 3
The Scaladoc describes the
zip method like this:
Returns a list formed from this list and another iterable collection by combining corresponding elements in pairs. If one of the two collections is longer than the other, its remaining elements are ignored.
It describes the
zipWithIndex method like this:
Zips this list with its indices. Returns: A new list containing pairs consisting of all elements of this list paired with their index. Indices start at 0.
For more information, see the documentation for the
zipWithIndex methods, which you can find on Scala collection classes, such as List.