Ruby after 18+ months of Clojure

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, [email protected], @marick

1 *Alternate title courtesy @infinitaryWednesday, January 18, 2012

mailto:[email protected]

mailto:[email protected]

Ladies and Gentlemen: The Computer

Wednesday, January 18, 2012




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f()g()

h()

j()

k()

m()

width

height

colorscofield_v

Our Friend, the Class


What Are Classes Good For?

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What Are Classes Good For?

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The Real World Has Fuzzy Categories


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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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cs { } [ ] ( )



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But At What Cost?


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Lookup


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Lookup


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?

Lookup

Copy


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?

Lookup

Copy


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?

Lookup

Copy


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Do The Simplest Thing That Could

Possibly Work


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ActiveRecord


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ActiveRecord

Wait. What?


id

uses

ctimesliceLookup

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Copy


id

uses

ctimeslice

Lookup

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Copy


Lookup

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id

uses

ctimeslice

Copy


Lookup

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id

uses

ctimeslice

Copy


copy comitted_animals

Lookup

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id

use ctim

idu cti

idu ctiCopy



Lookup

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id

use ctim

idu cti

idu ctiCopy



Lookup

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id

use ctim

idu cti

idu ctiCopy



Lookup

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id

use ctim

idu cti

idu cti

Copy



Lookup

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id

use ctim

idu cti

idu cti

Copy


Lookup

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Copy


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Copy

Lookup


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Copy

Lookup


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Lookup

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Copy


Lookup

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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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Immutability

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Immutability

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Immutability

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Hygiene


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Hygiene

“You’ve slept with everyoneeveryone you’ve ever slept with

ever slept with.”


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Hygiene


ever slept with.”

“Your code might be infected by any code that has ever touched your data.”


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a=Hygiene


ever slept with.”



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a=

a

Hygiene


ever slept with.”



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a=

a

Hygiene


ever slept with.”



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Consequences


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Consequences


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5

Consequences


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Consequences

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Consequences

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Consequences

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In Short: Why Not?

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In Short: Why Not?

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• Removes one source of bugs


In Short: Why Not?

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• Not harder than coding mutably

• (once you’re used to it)


In Short: Why Not?

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• Not harder than coding mutably

• (once you’re used to it)

• Knowing how to do more is better than knowing how to do less


Ruby

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Ruby

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Ruby

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Haskell


Ruby

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Haskell


Ruby

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Haskell Always Lazy


Ruby

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Haskell Always Lazy

Mostly Eager


Some Lazy Ruby

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Some Lazy Ruby


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Only a few special Ruby operators are lazy

Some Lazy Ruby


And Why Not?

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And Why Not?

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a=


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a=


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a=

a

a


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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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a

a

a=


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OMG!!! As Big As Garbage

Collection???


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Collection???CalculationsYou Trace

Through Time


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Collection???Resources You

ConsumeAs Needed

CalculationsYou Trace

Through Time


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Lazy Sequences


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Lazy Sequences


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Lazy Sequences


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Don’t LikeWhat You Get With Lazy Sequences


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How toMake theNext One



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WhichOnes



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WhichOnes



LikeWhat You Get With Lazy Sequences





How toMake the Next One



How toMake the Next One

WhichOnes


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github.com/marick/stunted

Google groups:rubyfoopers


https://github.com/marick/stunted


object.f(2, 3, 4)

def Float, Integer ...def Integer, Float

f.(2.0, 2)

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Google groups:rubyfoopers

github.com/marick/stunted

ExpressivenessEfficiency

Gems




Education

Ruby after 18+ months of Clojure