This tutorial book has been written more in a study-note or tutorial style and it covers seven popular topics in Data Structures and Algorithms---arrays, lists, stacks, queues, binary trees, sorting, and graphs. Arrays are implemented in an imperative style with the famous matrix multiplication problem. Most of the other topics are implemented in a functional style. So, if you are planning to learn functional version of Data Structures and Algorithms in Scala, this is the right book. The author has tried to make the book as accessible as possible. Most of the programs in this book are complete and running applications. Also each topic or subtopic has at least one complete and running example, which will save your time. There are interesting challenge exercises for highly motivated engineers and engineering students. Also the book includes solution to exercises so that you don't struggle, specially when you are time bound.