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Functional programming is a problem-solving paradigm that differs drastically from the imperative programming style of languages like C++ or Java. While functional programming principles have invaded most modern programming languages to some degree, there is no language that embraces this paradigm quite as Haskell does. As a result, Haskell code can reach a level of expressiveness, safety, and elegance that is difficult to achieve in other programming languages.

This course will introduce you to the core concepts of functional programming in Haskell. You will learn how to write pure functions using techniques such as pattern matching and recursion, and how to work with Haskell's powerful List data type. You will understand the basics of Haskell's powerful type system and define your own data types. Finally, you’ll learn how to perform IO operations the Haskell way. By the end of this course, you’ll have a new paradigm to add under your belt and you can start using functional programming in your own projects.

Learn Functional Programming in Haskell

## Evaluation order and termination
Previously, we saw that the order of evaluation does not influence the result of expressions. This changes, however, when non-termination comes into play.

As an example, let's revisit once more our function `both`, the reimplementation of the conjunctive boolean `&&` operator:

# Evaluation order and termination
Previously, we saw that the order of evaluation does not influence the result of expressions. This changes, however, when non-termination comes into play.

As an example, let's revisit once more our function `both`, the reimplementation of the conjunctive boolean `&&` operator:

Let's discuss the evaluation strategy of Haskell, called lazy evaluation.

Introduction

First Steps with Haskell

Techniques for Writing Functions

Working with Lists

Creating Data Types

Input and Output

Conclusion

Appendix

Lazy Evaluation

Evaluation order and termination