2008‐11‐19(Wed); AppleStore, Sapporo
Ruby Sapporo Night vol.8
Talking about “Fluent interface”
snoozer.05@ruby‐sapporo.org
Ruby /Ruby
SHIMADA Koji; Nihon Ruby-no-kai; RubySapporo
http://www.flickr.com/photos/mio-spr/2042538806

✓
✓
✓
✓
✓

RubyConf 2008
http://rubyconf.org/

Neal Ford,
Advanced DSL in Ruby
http://www.nealford.com/downloads/conferences/canonical/Neal_Ford-
Advanced_DSLs_in_Ruby-slides.pdf

Neal Ford,
Advanced DSL in Ruby
http://www.nealford.com/downloads/conferences/canonical/Neal_Ford-
Advanced_DSLs_in_Ruby-slides.pdf

Neal Ford,
Advanced DSL in Ruby
http://www.nealford.com/downloads/conferences/canonical/Neal_Ford-
Advanced_DSLs_in_Ruby-slides.pdf

?

✓
✓

http://www.flickr.com/photos/quanle/251201209/

http://www.flickr.com/photos/jw3000/12703492

Martinfowler’s Biki
http://capsctrl.que.jp/kdmsnr/wiki/bliki/?FluentInterface

Expect.Once.On(mockLogger)
.Method(“LogError”)
.With(Has.Substring(USER_NAME)
& Has.Substring(“access defined”));
mainframe.expects(once())
.method(“buy”).with(eq(QUANTITY))
.will(returnValue(TICKET));

✓
✓
✓

?

http://www.flickr.com/photos/srijith/1867095482

✓
✓

✓
✓

http://www.flickr.com/photos/mdd/175282811

✓
✓

✓
✓

http://www.flickr.com/photos/ozyman/443545349

✓
✓

✓
✓

✓
✓
✓

http://www.flickr.com/photos/fuckr/91530309

✓

Martinfowler’s Biki
http://capsctrl.que.jp/kdmsnr/wiki/bliki/?FluentInterface

Evolving an EDSL in Java
http://www.mockobjects.com/files/
evolving_an_edsl.ooplsa2006.pdf

✓
✓
✓
http://www.flickr.com/photos/17258892@N05/2588347668

http://www.flickr.com/photos/good_day/117131491/

✓
✓
✓

A B C
b
a c

tmp1 = data.grep(/foo/)
tmp2 = tmp1.uniq
tmp3 = tmp2.sort
tmp4 = tmp3.join(“¥n”)
tmp4.display
data.grep(/foo/).uniq.sort.join(“¥n”).display

http://www.flickr.com/photos/jacky83/2311687241

✓
✓
✓
✓

Transcript clear.
Transcript nextPutAll: ‘SHIMADA Koji’.
Transcript cr.
Transcript flush.
Transcript
clear;
nextPutAll: ‘SHIMADA Koji’;
cr;
flush

A
b
a c

✓
✓
✓

expectation.setCount(once());
expectation.setMethod(“buy”);
expectation.setArgument(eq(QUANTITY));
expectation.setResult(TICKET);
expectation.setCount(once())
.setMethod(“buy”)
.setArgument(eq(QUANTITY));
.setResult(TICKET);

http://www.flickr.com/photos/mio-spr/428995450

✓
✓
✓

expectation.setCount(once())
.setMethod(“buy”)
.setArgument(eq(QUANTITY));
.setResult(TICKET);
mainframe.expects(once())
.method(“buy”).with(eq(QUANTITY))
.will(returnValue(TICKET));

data.grep(/foo/).uniq.sort.join(“¥n”).display
(1..10).map{|i| i*i}.select{|i| i % 2 == 0}

data.grep(/foo/).uniq.sort.join(“¥n”).display
(1..10).map{|i| i*i}.select{|i| i % 2 == 0}
mainframe.expects(once())
.method(“buy”).with(eq(QUANTITY))
.will(returnValue(TICKET));

✓
✓
✓
http://www.flickr.com/photos/17258892@N05/2588347668

✓
✓
✓

rate = Discount.new
rate.cash = 0.05
rate.membership = 0.02
rate.price = 0.01
product.apply_discount(rate)

product.apply(
Discount.for.
cash(0.05).
membership(0.02).
price(0.01)
)

class Discount
...
def Discount.for
Discount.new
end
def cash(discount)
@for_cash = discount
self
end
end

class Discount
...
def Discount.for
Discount.new
end
def cash(discount)
@for_cash = discount
self
end
end

class Discount
...
def Discount.for
Discount.new
end
def cash(discount)
@for_cash = discount
self
end
end

class Product
...
def apply(discount)
@discount = discount
end
...
end

product.apply(
Discount.for.
cash(0.05).
membership(0.02).
price(0.01)
)

✓
✓
✓
✓

http://www.flickr.com/photos/srijith/1867095482

...a programmer’s job is too communicate
with other programmers, not just a machine.
Programming, then, is a human task
done by humans for humans.
Oh, and writing good code at the same time.

http://www.flickr.com/photos/suvcougar/

http://ja.wikipedia.org/wiki/%E5%8B%95%E7%B7%9A
✓
✓
✓

http://www.flickr.com/photos/storm-crypt/2280100565

✓
✓
✓
✓

http://www.flickr.com/photos/nibaq/1735007

✓
✓
✓
✓
✓
✓

✓
✓
✓
✓
✓
✓

http://www.flickr.com/photos/pedrosz/2287112249

2008‐11‐19(Wed); AppleStore, Sapporo
Ruby Sapporo Night vol.8
Talking about “Fluent interface”
snoozer.05@ruby‐sapporo.org
Ruby /Ruby
SHIMADA Koji; Nihon Ruby-no-kai; RubySapporo
http://www.flickr.com/photos/mio-spr/2042538806