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![Homoiconic John
“Clojure macro example: AND”
(defmacro and
([] true)
McCarthy
([x] x)
([x & rest] •
LISt Processing
`(let [and# ~x] aka
Lots of Irritating Superfluous Parenthesis
(if and# (and ~@rest) and#))))
• S-Expressions
func(x,y) => (func, x, y)
• Homoiconic
(metaprogramming++)
• Laziness parameter
evaluation
Saturday, November 19, 11](https://image.slidesharecdn.com/boost-your-oop-with-fp-111119125254-phpapp02/85/Boost-your-oop-with-fp-21-320.jpg)
![Clojure the modern Lisp
(ns bowling-game
(:use clojure.contrib.seq-utils))
(defn strike? [rolls]
(= 10 (first rolls)))
(defn spare? [rolls]
(= 10 (apply + (take 2 rolls))))
(defn balls-to-score
"How many balls contribute to this frame's score?"
[rolls]
(cond
(strike? rolls) 3
(spare? rolls) 3
:else 2))
(defn frame-advance
"How many rolls should be consumed to advance to the next frame?"
[rolls]
(if (strike? rolls) 1 2))
(defn frames
"Converts a sequence of rolls to a sequence of frames"
[rolls]
(when-let [rolls (seq rolls)]
(lazy-seq (cons (take (balls-to-score rolls) rolls)
(frames (drop (frame-advance rolls) rolls))))))
(defn score-frame
[frame]
(reduce + frame))
(defn score-game
"Score a bowling game, passed as a sequence of rolls."
[rolls]
(reduce + (map score-frame (take 10 (frames rolls)))))
Saturday, November 19, 11](https://image.slidesharecdn.com/boost-your-oop-with-fp-111119125254-phpapp02/85/Boost-your-oop-with-fp-22-320.jpg)
![bonusFrame
^self spare or: [self strike] Smalltalk
strike
^self roll1 = 10
an elegant
spare
^self roll1 < 10 and: [ self roll1 + self roll2 = 10].
weapon
roll1
^rolls at: frameStart
for a more
roll2
^rolls at: frameStart + 1
civilized
roll3
^rolls at: frameStart + 2
age
frameScore
| frameScore |
frameScore := self roll1 + self roll2.
self bonusFrame ifTrue: [ frameScore := frameScore + self roll3 ].
^frameScore
updateFrameStart
self strike
ifTrue: [ frameStart := frameStart + 1]
ifFalse: [ frameStart := frameStart + 2]
score
10 timesRepeat:
[score := score + self frameScore.
self updateFrameStart].
^score
initialize
rolls := OrderedCollection new.
score := 0.
frameStart := 1.
^self
Saturday, November 19, 11](https://image.slidesharecdn.com/boost-your-oop-with-fp-111119125254-phpapp02/85/Boost-your-oop-with-fp-26-320.jpg)
![bonusFrame
^self spare or: [self strike] Smalltalk
strike
^self roll1 = 10
an elegant
spare
^self roll1 < 10 and: [ self roll1 + self roll2 = 10].
weapon
roll1
^rolls at: frameStart
for a more
roll2
^rolls at: frameStart + 1
civilized
roll3
^rolls at: frameStart + 2
age
frameScore
| frameScore |
frameScore := self roll1 + self roll2.
self bonusFrame ifTrue: [ frameScore := frameScore + self roll3 ].
^frameScore
updateFrameStart
self strike
ifTrue: [ frameStart := frameStart + 1]
ifFalse: [ frameStart := frameStart + 2]
score
10 timesRepeat:
[score := score + self frameScore.
self updateFrameStart].
^score
initialize
rolls := OrderedCollection new.
score := 0.
frameStart := 1.
^self
Saturday, November 19, 11](https://image.slidesharecdn.com/boost-your-oop-with-fp-111119125254-phpapp02/85/Boost-your-oop-with-fp-27-320.jpg)
![Centralized
Invoice
Customer
Invoice
Martin Fowler: (http://martinfowler.com/bliki/
AnemicDomainModel.html)
The basic symptom of an Anemic Domain Model is that Printer
at first blush it looks like the real thing. [...] The catch
Manager
comes when you look at the behavior, and you realize
that there is hardly any behavior on these objects,
making them little more than bags of getters and setters.
[...] The key point here is that the Service Layer is thin -
all the key logic lies in the domain layer.
Saturday, November 19, 11](https://image.slidesharecdn.com/boost-your-oop-with-fp-111119125254-phpapp02/85/Boost-your-oop-with-fp-65-320.jpg)
![The valley
Elegance and familiarity are orthogonal
of comfort
Rich Hickey on #Clojure
A Conversation with Ward Cunningham, Part III (5 January 2004)
The Accidental Architecture
I like the notion of working the program, like an artist works a lump of
clay. An artist wants to make a sculpture, but before she makes the
sculpture, she just massages the clay.
[...] In a sense we get the architecture without really trying. All the
decisions in the context of the other decisions simply gel into an
architecture.
http://www.flickr.com/photos/lviggiano
Saturday, November 19, 11](https://image.slidesharecdn.com/boost-your-oop-with-fp-111119125254-phpapp02/85/Boost-your-oop-with-fp-70-320.jpg)
![The valley
Elegance and familiarity are orthogonal
of comfort
Rich Hickey on #Clojure
There are two ways of constructing a
software design.
One way is to make it so simple that there are
obviously no deficiencies.
And the other way is to make it so
A Conversation with Ward Cunningham, Part III (5 January 2004)
complicated that there are no obvious
deficiencies.
The Accidental Architecture
[C.A.R. Hoare]
I like the notion of working the program, like an artist works a lump of
clay. An artist wants to make a sculpture, but before she makes the
sculpture, she just massages the clay.
[...] In a sense we get the architecture without really trying. All the
decisions in the context of the other decisions simply gel into an
architecture.
http://www.flickr.com/photos/lviggiano
Saturday, November 19, 11](https://image.slidesharecdn.com/boost-your-oop-with-fp-111119125254-phpapp02/85/Boost-your-oop-with-fp-71-320.jpg)
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Uploaded byUberto Barbini
Boost your-oop-with-fp
The document discusses object-oriented programming (OOP) and functional programming (FP). It introduces the presenter, Uberto Barbini, as a software artisan and agile enthusiast. Barbini questions if OOP was wrong and suggests OOP is only a tool that needs to be kept sharp by learning other tools, like FP. The presentation later discusses state as the foundation of behavior but also being hidden from the outside and needing protection. Functional programming is said to expel state from functions.
