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Slides for February 17 Groupon geekfest lunch
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Ruby After 18+ Months of Clojure
-or-
Functional Learnings of Clojure for Make Benefit of Glorious Language of Ruby*
(a work in progress)
Brian Marick, Path11brian@path11.com, @marick
1 *Alternate title courtesy @infinitaryWednesday, January 18, 2012
Ladies and Gentlemen: The Computer
Wednesday, January 18, 2012
Wednesday, January 18, 2012
Wednesday, January 18, 2012
Wednesday, January 18, 2012
4
f()g()
h()
j()
k()
m()
width
height
colorscofield_v
Our Friend, the Class
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What Are Classes Good For?
5
Wednesday, January 18, 2012
What Are Classes Good For?
5
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6
The Real World Has Fuzzy Categories
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6
The Real World Has Fuzzy Categories
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f()g()
h()
j()
k()
m()
width
height
colorscofield_v
Classes Are For Finding Things
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Classes Are For Finding Things
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wh
cs
wh
cs
wh
cs
wh
cs
wh
cs
wh
cs
wh
cs
wh
cs
wh
cs
wh
cs
wh
cs
wh
cs
Wednesday, January 18, 2012
Classes Are For Finding Things
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wh
cs
wh
cs
wh
cs
wh
cs
wh
cs
wh
cs
wh
cs
wh
cs
wh
cs
wh
cs
wh
cs
wh
cs { } [ ] ( )
Wednesday, January 18, 2012
Classes Are For Finding Things
8
wh
cs
wh
cs
wh
cs
wh
cs
wh
cs
wh
cs
wh
cs
wh
cs
wh
cs
wh
cs
wh
cs
wh
cs { } [ ] ( )
Wednesday, January 18, 2012
Classes Are For Finding Things
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wh
cs
wh
cs
wh
cs
wh
cs
wh
cs
wh
cs
wh
cs
wh
cs
wh
cs
wh
cs
wh
cs
wh
cs { } [ ] ( )
Wednesday, January 18, 2012
Classes Are For Finding Things
8
wh
cs
wh
cs
wh
cs
wh
cs
wh
cs
wh
cs
wh
cs
wh
cs
wh
cs
wh
cs
wh
cs
wh
cs { } [ ] ( )
Wednesday, January 18, 2012
Classes Are For Finding Things
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wh
cs
wh
cs
wh
cs
wh
cs
wh
cs
wh
cs
wh
cs
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cs { } [ ] ( )
But At What Cost?
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10
Lookup
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Lookup
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?
Lookup
Copy
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12
?
Lookup
Copy
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12
?
Lookup
Copy
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13
Do The Simplest Thing That Could
Possibly Work
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ActiveRecord
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ActiveRecord
Wait. What?
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id
uses
ctimesliceLookup
15
Copy
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id
uses
ctimeslice
Lookup
15
Copy
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Lookup
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id
uses
ctimeslice
Copy
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Lookup
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id
uses
ctimeslice
Copy
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copy comitted_animals
Lookup
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id
use ctim
idu cti
idu ctiCopy
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copy comitted_animals
Lookup
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id
use ctim
idu cti
idu ctiCopy
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copy comitted_animals
Lookup
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id
use ctim
idu cti
idu ctiCopy
Wednesday, January 18, 2012
copy comitted_animals
Lookup
17
id
use ctim
idu cti
idu cti
Copy
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copy comitted_animals
Lookup
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id
use ctim
idu cti
idu cti
Copy
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Lookup
18
Copy
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Copy
Lookup
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19
Copy
Lookup
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Wednesday, January 18, 2012
Lookup
21
Copy
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Lookup
21
Copy
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and...
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and...
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{ }
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{ }
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{ }
{ }
{ }
{ }
{ }
{ }
{ }
{ }
{ }
{ }
{ }{ }
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Wednesday, January 18, 2012
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Wednesday, January 18, 2012
Immutability
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Wednesday, January 18, 2012
Immutability
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Immutability
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Wednesday, January 18, 2012
29
Hygiene
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29
Hygiene
“You’ve slept with everyoneeveryone you’ve ever slept with
ever slept with.”
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29
Hygiene
“You’ve slept with everyoneeveryone you’ve ever slept with
ever slept with.”
“Your code might be infected by any code that has ever touched your data.”
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29
a=Hygiene
“You’ve slept with everyoneeveryone you’ve ever slept with
ever slept with.”
“Your code might be infected by any code that has ever touched your data.”
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29
a=
a
Hygiene
“You’ve slept with everyoneeveryone you’ve ever slept with
ever slept with.”
“Your code might be infected by any code that has ever touched your data.”
Wednesday, January 18, 2012
29
a=
a
Hygiene
“You’ve slept with everyoneeveryone you’ve ever slept with
ever slept with.”
“Your code might be infected by any code that has ever touched your data.”
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Consequences
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30
Consequences
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5
Consequences
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Consequences
5
Wednesday, January 18, 2012
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Consequences
5
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Consequences
5
Wednesday, January 18, 2012
33
Wednesday, January 18, 2012
In Short: Why Not?
34
Wednesday, January 18, 2012
In Short: Why Not?
34
• Removes one source of bugs
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In Short: Why Not?
34
• Removes one source of bugs
• Not harder than coding mutably
• (once you’re used to it)
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In Short: Why Not?
34
• Removes one source of bugs
• Not harder than coding mutably
• (once you’re used to it)
• Knowing how to do more is better than knowing how to do less
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Ruby
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Wednesday, January 18, 2012
Ruby
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Wednesday, January 18, 2012
Ruby
35
Haskell
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Ruby
35
Haskell
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Ruby
35
Haskell Always Lazy
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Ruby
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Haskell Always Lazy
Mostly Eager
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Some Lazy Ruby
36
Wednesday, January 18, 2012
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Some Lazy Ruby
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Only a few special Ruby operators are lazy
Some Lazy Ruby
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And Why Not?
38
Wednesday, January 18, 2012
And Why Not?
39
Wednesday, January 18, 2012
40
a=
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40
a=
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40
a=
a
a
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40
a=
a
a
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a=
a
a
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a=
a
a
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a=
a
a
OneLessThing
toWorryAbout
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a=
a
a
free(a)
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a=
a
a
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43
a
a
a=
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Wednesday, January 18, 2012
44
OMG!!! As Big As Garbage
Collection???
Wednesday, January 18, 2012
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OMG!!! As Big As Garbage
Collection???CalculationsYou Trace
Through Time
Wednesday, January 18, 2012
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OMG!!! As Big As Garbage
Collection???Resources You
ConsumeAs Needed
CalculationsYou Trace
Through Time
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45
Lazy Sequences
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45
Lazy Sequences
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45
Lazy Sequences
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Don’t LikeWhat You Get With Lazy Sequences
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How toMake theNext One
Don’t LikeWhat You Get With Lazy Sequences
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46
How toMake theNext One
Don’t LikeWhat You Get With Lazy Sequences
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46
How toMake theNext One
WhichOnes
Don’t LikeWhat You Get With Lazy Sequences
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46
How toMake theNext One
WhichOnes
Don’t LikeWhat You Get With Lazy Sequences
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LikeWhat You Get With Lazy Sequences
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LikeWhat You Get With Lazy Sequences
Wednesday, January 18, 2012
LikeWhat You Get With Lazy Sequences
How toMake the Next One
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LikeWhat You Get With Lazy Sequences
How toMake the Next One
WhichOnes
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48
github.com/marick/stunted
Google groups:rubyfoopers
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object.f(2, 3, 4)
def Float, Integer ...def Integer, Float
f.(2.0, 2)
49
Wednesday, January 18, 2012
50
Google groups:rubyfoopers
github.com/marick/stunted
ExpressivenessEfficiency
Gems
Wednesday, January 18, 2012
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