Hiram Kamau

Articles: 26

Joined: Jan 02, 2020

In addition to catching code errors and going through debugging hell, I also obsess over whether writing in an active voice is truly better than doing it in passive.

Recently published

Article

Java 8 - Collect Stream into Unmodifiable List, Set or Map

A stream represents a sequence of elements and supports different kinds of operations that lead to the desired result. The source of a stream is usually a Collection or an Array, from which data is streamed from. Streams differ from collections in several ways; most notably in that the streams...

David Landup

Dec 17, 2021

Article

Java 8 Streams - Collect and Reverse Stream into List

Hiram Kamau

Dec 13, 2021

Article

Guide to Java 8 Collectors: collectingAndThen()

Hiram Kamau

Dec 08, 2021·37 min read

Article

Java 8 Streams: Definitive Guide to flatMap()

Mapping elements from one collection to another, applying a transformative function between them is a fairly common and very powerful operation. Java's functional API supports both map() and flatMap(). If you'd like to read more about map(), read our Java 8 - Stream.map() Examples! The flatMap() operation is similar...

Hiram Kamau

Nov 30, 2021

Article

Java 8 Streams: Definitive Guide to Parallel Streaming with parallel()

Today, the Java Streams API is in extensive use, making Java more functional than ever. Thus, models like MapReduce have emerged for easier stream handling. Although these models made using streams effortless, they've also introduced efficiency concerns. The built-in parallel() operation is simple enough to deploy, and allows you to...

Hiram Kamau

Nov 22, 2021

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Java 8 Streams: Definitive Guide to reduce()

The reduce() method is Java 8's answer to the need for a fold implementation in the Stream API. Folding is a very useful and common functional programming feature. It operates on a collection of elements to return a single result using some sort of operation. Note: Folding is also known...

Hiram Kamau

Sep 30, 2021

Article

Java 8 Streams: Definitive Guide to findFirst() and findAny()

The findFirst() and findAny() methods are terminal operations (terminate and return results) of the Stream API. Yet, there is something special about them - they not only terminate a stream, but also short circuit it: List<String> people = List.of("John", "Janette", "Maria&...

Hiram Kamau

Sep 22, 2021

Article

Java 8 Streams: Definitive Guide to the filter() Method

The Java Streams API simplifies working with a collection of elements. Because streams turn these elements into a pipeline, you could test them using a set of conditions (known as predicates), before finally acting on those that meet your criteria. The filter() method is one such operation that tests the...

Hiram Kamau

Sep 08, 2021·25 min read

Article

Guide to Java 8 Collectors: Definitive Guide to toList()

Streams don't hold any data by themselves - they just stream it from a source. Yet, common code routines expect some sort of a structure to hold results after processing data. That is why, after (optional) intermediate operations, the Stream API provides ways to convert the elements that it may...

Hiram Kamau

Sep 01, 2021·19 min read