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How are iterators used in a collection in Scala?
Iterators in Scala Last Updated : 30 Sep, 2019 An iterator is a way to access elements of a collection one-by-one. It resembles to a collection in terms of syntax but works differently in terms of functionality.
Which is an example of recursion in Scala?
Recursion is considered as to be important in functional programming. Scala supports Recursion very well. Let us understand using the simple factorial example. The above code demonstrated in a recursive approach to a factorial function, where the condition n == 1 results in a break from the recursion.
Which is an example of a traversable in Scala?
A common use case of TraversableOnce is as an argument type for methods that can take either an iterator or a traversable as argument. An example is the appending method ++ in class Traversable. It takes a TraversableOnce parameter, so you can append elements coming from either an iterator or a traversable collection.
Why is recursion so important in functional programming?
Recursion avoids mutable state associated with loops. Recursion is quite common in functional programming and provides a natural way to describe many Algorithms. Recursion is considered as to be important in functional programming. Scala supports Recursion very well.
How to split a list into subsets in Scala?
The span method returns a Tuple2 based on your predicate p, consisting of “the longest prefix of this list whose elements all satisfy p, and the rest of this list.” The splitAt method splits the original list according to the element index value you supplied.
How are groupby, partition, and span methods used?
The groupBy, partition, and span methods let you split a sequence into subsets according to a function, whereas splitAt lets you split a collection into two sequences by providing an index number, as shown in these examples: The groupBy method partitions the collection into a Map of sub-collections based on your function.
How is the splitat method used in groupby?
The splitAt method splits the original list according to the element index value you supplied. When a Tuple2 of sequences is returned, its two sequences can be accessed like this: The sequences in the Map that groupBy creates can be accessed like this: