Transforming Data using the Functional API
summary
Shows concrete Java code patterns using the Streams and Collectors APIs (Java 8+), demonstrating filter map reduce as the core model and using Collectors like Collectors.joining and toList/toSet/toMap, plus partitioning and groupingBy with mapping/counting; gives a working example that finds the first repeated letter in "hello" by comparing indexOf/lastIndexOf, shows a reduce totaling ages (result 60) and counting evens (result 5), and explains lazy evaluation and short-circuiting.
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chapters (9)
- 0:00Introduction to functional API
- 1:21Filtering collections of data
- 5:10Transforming data with map
- 8:38Reducing data to single values
- 17:37Specialized reduction operations
- 23:37Lazy evaluation and efficiency
- 31:39Solving real-world problems
- 43:04Collectors and data grouping
- 52:45Grouping and conclusion
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