Scala Tutorial - Maps, Sets, groupBy, Options, flatten, flatMap | Java Code Geeks

Scala Tutorial – Maps, Sets, groupBy, Options, flatten, flatMap | Java Code Geeks

November 26, 2014 4:11 pm Scala Tutorial – Maps, Sets, groupBy, Options, flatten, flatMap Preface This is part 7 of tutorials for first-time programmers getting into Scala. Other posts are on this blog, and you can get links to those and other resources on the links page of the Computational Linguistics course I’m creating these for. Additionally you can find this and other tutorial series on the JCG Java Tutorials page. Lists (and other sequence data structures, like Ranges and Arrays) allow you to group collections of objects in an ordered manner: you can access elements of a list by indexing their position in the list, or iterate over the list elements, one by one, using for expressions and sequence functions like map, filter, reduce and fold. Another important kind of data structure is the associative array, which you’ll come to know in Scala as a Map. (Yes, this has the unfortunate ambiguity with the map function, but their use will be quite clear from context.

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