Who's More Functional: Kotlin, Groovy, Scala, or Java?

Oct 5, 201230 likes15,367 views

This document is a presentation by Andrey Breslav about functional programming concepts and how Java, Kotlin, Scala, and Groovy measure up in terms of functional capabilities. It discusses topics like recursion, purity, effects, higher order functions, and testing functional implementations. It notes that while these languages support some functional programming concepts, they are not purely functional due to their support for effects like printing and file writing.

Who's More Functional
Groovy, Kotlin, Scala or
Java?

Andrey Breslav

Wednesday, October 3, 12 1

About Me

• Project lead of Kotlin
➡ at JetBrains since 2010

Andrey Breslav

• EG member of JSR-335
➡ Project Lambda

2
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Prologue
– Dad (or Mom), is Java a
functional language?

3
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Prologue
– Dad (or Mom), is Java a
functional language?

– Don't you know your dad
from your mom?!

3
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What is FP like?

Wednesday, October 3, 12 4

Alonzo Church 𝛌
1936
5
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Alonzo Church 𝛌
1936 1946
5
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Alonzo Church 𝛌
1936 1946 1956
5
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John Backus

Alonzo Church 𝛌
1936 1946 1956
5
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Can Programming
be Liberated from
the von Neumann
Style?

John Backus

Alonzo Church 𝛌
1936 1946 1956 1976
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– Dad, what's
good about FP?

6
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– Dad, what's
good about FP?
– It makes you
look smart

6
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– Dad, what's
good about FP?
– It makes you
look smart
– Like wearing
glasses?

6
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Effects (Mutability)

𝛌
John von Neumann

Inputs
commands

State VS f(g(x), y)

Outputs
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1, 1, 2, 3, 5, 8, 13, 21, 34, ...

Leonardo Fibonacci

Wednesday, October 3, 12 8

1, 1, 2, 3, 5, 8, 13, 21, 34, ...
Are you functional?

Kotlin V
Groovy V
Leonardo Fibonacci
Scala V
Java 8 V
Recursion

Wednesday, October 3, 12 8

1, 1, 2, 3, 5, 8, 13, 21, 34, ...

Leonardo Fibonacci
commands

State

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Effect-Free

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Effect-Free
– Dad, how do I

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Effect-Free
– Dad, how do I
- print("Hello")?

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Effect-Free
– Dad, how do I
- print("Hello")?
- write to a file?

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Effect-Free
– Dad, how do I
- print("Hello")?
- write to a file?
- do both?

10
Wednesday, October 3, 12 10

Effect-Free
Are you functional?

Kotlin V X
– Dad, how do I
- print("Hello")?
Groovy V X
- write to a file?
Scala V X
- do both?
Java 8 V X
Recursion Pure

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Summary
• FP makes things simpler
• Sometimes at a huge price

• Our languages are
not purely functional

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Higher Order
FP brings order :)

Wednesday, October 3, 12 12

FibonacciTest

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FibonacciTest

– How do I test both
implementations?

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test(f)
Are you functional?

Kotlin V X V
Groovy V X V
Scala V X V
Java 8 V X V
Recursion Pure HO

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GoF and FP rd er
r-O n
he io
ig ct
H n
Strategy = Fu

Command Observer Abstract State Visitor
Factory

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Internal Iteration

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Internal Iteration

users: ArrayList
user 1 Hello

user 2 Hello

user 3 Hello

user 4 Hello

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Internal Iteration

users: ArrayList users: ParallelCollection
user 1 Hello

user 2 Hello

user 3 Hello

user 4 Hello

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Summary
• Good old callbacks/strategies
• Very important abstraction

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ADT
What is your "A" for?

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Example: Messages
Server Client

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Example: Messages
Server Client
search for "lambda"

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Wednesday, October 3, 12 19

Example: Messages
Server Client
search for "lambda"
exact match at ...

19
Wednesday, October 3, 12 19

Example: Messages
Server Client
search for "lambda"
exact match at ...
similarity at ...

19
Wednesday, October 3, 12 19

Example: Messages
Server Client
search for "lambda"
exact match at ...
similarity at ...

message ::= search for term
| exact item
| similar item
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ADT

Abstract Algebraic
data type data type
~I ~D
nte ata
rfa cla
ce ss

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Are you functional?
ADT

Kotlin V X V V
Groovy V X V V
Abstract Algebraic
Scala typeV
data X V data type
V
~I V ~D
Java 8 nt X V V ata
erf cla
ace ss
Recursion Pure HO ADT

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ADT in Kotlin

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Utilization
You may have your cake, but can you eat it too?

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Up to 5 HO-functions
for free! g rad
U p for
e

m ore

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Static Utility Methods

backwards!

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Static Utility Methods

backwards!

as opposed to

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Extension Functions

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Extension Functions
Receiver Type

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Extension Functions
Receiver Type

receiver

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Summary
• Extending existing types
• Without changing the classes

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– Dad, should I use FP?

Epilogue

Wednesday, October 3, 12 27

– Dad, should I use FP?

Epilogue

– What is your problem?!

Wednesday, October 3, 12 27

– Dad, should I use FP?

Epilogue

– What is your problem?!

P.S. Kotlin is cool :) http://kotlin.jetbrains.org
Wednesday, October 3, 12 27

Kotlin Resources
• Docs: http://kotlin.jetbrains.org
• Demo: http://kotlin-demo.jetbrains.com
• Code: http://github.com/jetbrains/kotlin
• Twitter:
➡ @project_kotlin
➡ @abreslav

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Wednesday, October 3, 12 28

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