Kotlin Standard Library Cookbook

Discovering the concept of sequences

In terms of high-level functionalities, the Sequence and Collection data structures are nearly the same. They both allow iteration through their elements. There are also many powerful extension functions in the Kotlin standard library that provide declarative-style data-processing operations for each of them. However, the Sequence data structure behaves differently under the hood—it delays any operations on its elements until they are finally consumed. It instantiates the subsequent elements on the go while traversing through them. These characteristics of Sequence, called lazy evaluation, make this data structure quite similar to the Java concept,  Stream.  To understand all of this better, we are going ...