November 2017
Beginner to intermediate
290 pages
7h 34m
English
book
Learning Apache Apex
by Ananth Gundabattula, Thomas Weise, Munagala V. Ramanath, David Yan, Kenneth Knowles
Content preview from Learning Apache Apex
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Splitting each line on spaces
In order to count the words, we have to get the words. For simplicity, we will just hand-craft a regular expression for splitting, and not even take into account any text file formatting:
FlatMapElements
.into(TypeDescriptors.strings())
.via((String word) -> Arrays.asList(word.split("[^\\p{L}]+")))
Here, FlatMapElements accepts a function that takes one input and results in possibly many outputs. It is identical to flatMap you may be familiar with from functional programming.
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