Refactoring from the Imperative to the Functional Style

This page was contributed by Venkat Subramaniam under the UPL

This part of the tutorial helps you to learn the functional style equivalent of the imperative style code we often find. As you move forward in your projects, wherever it makes sense, you can change imperative style code to functional style code using the mappings you learn in this tutorial.

In this series we cover the following conversions from the imperative to the functional style:

Tutorial	Imperative Style	Functional Style Equivalent
Converting Simple Loops	for()	range() or rangeClosed()
Converting Loops with Steps	for(...i = i + ...)	iterate() with takeWhile()
Converting foreach with if	foreach(...) { if... }	stream() with filter()
Converting Iteration with transformation	foreach(...) { ...transformation... }	stream() with map()
Converting to Streams	File read operation	Files.lines()

1. Converting Simple Loops
   

   Converting Simple Imperative Loops to Functional Style.

2. Converting Loops with Steps
   

   Converting Imperative Loops with Steps to Functional Style.

3. Converting foreach with if
   

   Converting Imperative Iteration using foreach with if to Functional Style.

4. Converting Iteration with transformation
   

   Converting Imperative Iteration with transformation to Functional Style.

5. Converting Data Sources to Streams
   

   Converting Data Sources to Streams.

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