Immutabilityin Ruby, Python, JavaScript, and Clojure

@teropa

http://www.flickr.com/photos/53952283@N02/4992136318/

Two Realities

Two Realities

Global Mutable State

Non–global Mutable State

Spot The Wormhole

Players

Ruby Python Clojure JavaScript

PrimitivesLevel 1

42

42 + 42

42 + 42

42 + 42

(+ 42 42)

(Math/abs -42)

Math.abs(-42)

abs(-42)

-42.abs

High Scores

1000 1000 1000 1000

Ruby Python Clojure JavaScript

StringsLevel 2

"Am I immutable?"

"Am I immutable?"

A I m u a l ? m i m t b e

JavaScript

Python

Clojure

Ruby

Ruby

Ruby

High Scores

1500 2000 2000 2000

Ruby Python Clojure JavaScript

CollectionsLevel 3

Clojure

Ruby

Rubyice_nine

Rubyhamster

Python

JavaScript

JavaScriptmori

Final Scores

2000 2750 3000 2500

Ruby Python Clojure JavaScript

kthx.

@teropa clojurecup.comis.gd/vertxbook