Becoming Functional

Index

Symbols

:: operator, Extracting Lists

?: (see ternary operator)

@Lazy annotation, Nonstrict (Lazy) Evaluation

example of good usage in Groovy, Laziness Can Create Problems

laziness problem in Groovy, Laziness Can Create Problems

@tailrec annotation, Introducing Scala

A

alternate constructors (Scala), Block Statements

anonymous functions, Anonymous Functions

closures, Closures

lambda functions, Lambda Functions

appending rather than prepending to output list, Tail Recursion

assignment statements, Statements

B

Backus, John, Introduction

bean methodology in Java, Everything Is a Statement

block statements, Block Statements

body of a function, Functions as Objects

C

Calendar object, Block Statements

case classes, Extracting Lists, The Option Pattern (Extension of Null Object Pattern)

CommandLineOption, Code as Data

Customer class defined as, Converting to Pattern Matches

matching a specific value in, Extracting Objects

case keyword, defining patterns, Simple Matches

classes

reducing number with functional OOP, Conclusion

Scala, Simple Statements

Clojure, What Next?

closed-over variables, marking as final, Closures

closures, Anonymous Functions, Closures

breaking function purity, Output Depends on Input

using with eachEnabledContact (example), Mutability

code examples from this book, How to Contact Us

Command pattern, Conclusion

Scala Command pattern using functions, Conclusion

CommandLine object (example), Code as Data

askForInput method, Code as Data

options variable, Code as Data

print each enabled contact option, ...