Functional-style Programming in Java using Lambdas & Streams

Name: Functional-style Programming in Java using Lambdas & Streams
Rating: 4.5 (35 reviews)

Write elegant and efficient code by mastering Functional Programming in Java with constructs such as Lambdas & Streams!

Created byDheeru Mundluru

Last updated 6/2021

English

What you'll learn

Gain in-depth understanding of Lambdas, Method & Constructor References, and Functional Interfaces
Gain deep understanding of Streams and how to use them effectively
Get comfortable with Streams API & Stream Paradigm through challenging coding exercises
Learn to write elegant, concise and efficient Functional-style code
Learn best practices for using Lambdas & Streams

Coding Exercises

This course includes our updated coding exercises so you can practice your skills as you learn.

Course content

6 sections • 31 lectures • 6h 29m total length

Course Introduction3:03
Functional-style Programming: Motivation & Agenda8:18

Streams + Demo23:41
Stream Operations: An Overview7:03
Explore the classification of Java stream operations, including intermediate and terminal types, and how a stream pipeline processes elements from a collection source.
Demo: Slicing a Stream18:50
flatMap Operation7:50
Explore the flatMap operation in Java streams, showing how map transforms orders into lists and flattening yields a single stream of items for downstream processing.
Demo: flatMap Operation5:17
Demo: Stream Matching Operations10:33
Demo: Stream Finding Operations & Optional Class18:27
Coding Exercise: Implementing Flight Reservation System
Solution: Implementing Flight Reservation System0:02
Stream Reduction Operations + Demo23:10
Let's test our skills on reduce() operation
Coding Exercise: Covid Tracking with reduce()
Solution: Covid Tracking with reduce()10:00
Use reduce to compute total daily active covid cases across districts, and identify the district with the lowest and highest cases within a state, in a simple covid tracking app.
Special Cases of Reduction Operation7:05
Explore special cases of reduction in Java streams: the min and max terminal operations, and the count method. These relate to the general reduced method that uses an accumulator function.
Mutable Reduction with Collection Operations + Demo23:34
collect() with Collector10:52
Explore java streams collect with collector. Learn how supplier, accumulator, combiner, and finisher enable mutable reductions, and use predefined collectors for joining, listing, mapping, grouping, and partitioning.
Demo: Collecting Stream into List & Set12:01
Learn how to collect stream elements into lists and sets using collectors, including toList, toSet, and toCollection, with examples of distinct filtering, suppliers, and constructor references.
Coding Exercise: Covid Tracking with collect()
Solution: Covid Tracking with collect()0:02
Demo: Grouping Stream Elements18:32
Demo: Summarizing Groups & Generating Multi-level Groups25:16
Explore grouping by with Java streams to build multi-level maps and summarize values using downstream collectors such as counting, averaging, minimum, and maximum. Also learn partitioning by and mapping titles.
Side-effect Free Functions4:50
Demo: Streams & Side-effect Free Functions21:37
Learn functional-style Java streams and lambdas, focusing on side-effect free functions to avoid non-deterministic results in parallel streams, using a health data example with diabetic patients and average age.

Requirements

Basic understanding of Java is required
Demos are shown in Eclipse and so you should be able to follow along

Description

Writing elegant & readable code is extremely important when building software. However, sometimes we are limited by the features of the programming language and this was the case with Java too. Code written in Java was sometimes considered verbose, which in turn made it difficult to understand. However, this started to change since Java 8 and subsequent releases. Java 8 is one of the major Java releases and it incorporated Functional-style Programming paradigm into the language by introducing constructs such as lambdas & streams. Functional programming helps us in writing code that is compact, clean and efficient.

This course will give you an in-depth understanding of Functional-style Programming in Java. All the relevant features like Lambdas, Functional Interfaces, Method & Constructor references, and Streams will be explained in great detail. You will learn how we can write compact & clean code via declarative-style programming using Streams. Every concept is clearly explained with well thought out & realistic examples, nice illustrations and demonstrated in code. Several challenging coding exercises are included to validate what you have learnt and to help you get comfortable with functional-style programming paradigm. With over 6 hours of high quality video lectures, the course is self-paced with life-time access. You get a certificate upon course completion.

Who this course is for:

Programmers who are familiar with Java, but are either new or not comfortable with Java Functional Programming Constructs

Functional-style Programming in Java using Lambdas & Streams

What you'll learn

Explore related topics

Coding Exercises

Course content

Introduction2 lectures • 11min

Lambda Expressions & Passing Behavior5 lectures • 59min

Deep Dive into Standard Functional Interfaces2 lectures • 40min

Method & Constructor References2 lectures • 22min

Processing Data with Streams19 lectures • 4hr 9min

Conclusion1 lecture • 9min

Requirements

Description

Who this course is for: