f# path to relaxation
TRANSCRIPT
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| Basel
The F# Path toRelaxationLanguage Design, Tools, Platforms, Community, Ecosystem,Exosystem, Oenness, Cross!latform, "
Don yme, F# Community Contri$utor
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% &entle troll Through the Lan' of LaDesign an' Deli(ery
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% starting osition")
The great 'isutes of comuter scishoul' $e struggle' *ith
They are chances to ma+e a $etter, smore relaxe' *orl' as much as cre
oosing cams
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-ou can of course ta+e this too f
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0 -?
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Functional 1nter
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Then 23445/
Functional languages *ere isolate', n
interoera$le, using their o*n 67s) 1ntstan'ar's li+e C!calls, CO7, CORB%, 07L
mess for language!integration)
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The F# %roach 2also cala, *ift
Em$race in'ustry!stan'ar' runtime layers, an'
them) 9ee exosystem at an aroriate 'istanc*ith en'!to!en' intero in min') Comromise
nee'e')
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Relaxation %chie(e', 344: ;
; To'ay<s FP languages are immensely intero
*hile staying true to FP rinciles); F# tye ro(i'ers raise intero to a comlet
le(el
= ome tensions remain > not all functional techni?ues are easily imlementestan'ar' 67s
Functional
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0 -?
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Enterrise
Oens
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TL@DR > Ahere *e are no*
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1n one year, *e<(e come along *ay
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The F# Comiler > 544 Pull Re?uesrising
Ahere to Contri$ute
ee fshar)githu$)io
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The F# Language Design Proc
fslang)user(oice)com
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F# )4
; True shift to cross!latform oenengineering
; Long laun'ry list of language items; ormalie' core li$rary; Tye ro(i'ers more o*erful
; Better 'e$ugging, tooling, erformance
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The F# Comiler er(ice
fshar)githu$)ioHFhar)Comiler)er(ic
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Relaxation %chie(e' ;
Enterrise Iuality Oenness
Community Tooling Ecosystem E(olution PathJ
&oo'ness
Enterrise
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Functional O$Kec
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Then 23445/
1n the MM4s functional languages *ere hisanti!OO
E(en to'ay any mention of o$Kects gi(es some eoNurrgghhh" reaction)
7o'ern Comiler 1mlementation *ith tan'ar' 7L ! CO$Kect Oriente' Programming
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F# ! O$Kects Functional
type Vector2D (dx:double, dy:double) =
let d2 = dx*dx+dy*dy
member v.DX = dx
member v.DY = dy
member v.Lengt = !"rt d2
member v.#c$le(%) = Vector2D (dx*%, dy*%)
Inputs to objeconstructio
Exported prope
Exported met
Object intern
O$K
Constructed Class Types
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O$Kects
Object Interface Types
type IObject =&nter'$ce ISimpleObject
$b!tr$ct Prop1 : type $b!tr$ct Meth2 : type -> type
Object Expression
{ ne IObject &t member x.Prop1 = expr
member x.Meth1 args = e
{ ne Object() withmember x.Prop1 = expr
&nter'$ce IObject &t member x.Meth1 args = &nter'$ce Ii!"et &t member x.Meth1 args =
Constructed Class Types
type Object#$pe(args) = let i%ter%&l'&le = expr
let i%ter%&l%ctio% args = expr let mut$ble i%ter%&lSt&te = expr member x.Prop1 = expr member x.Meth2 args = expr
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The F# aroach is to em$race o$Kects,them t *ith the exression!oriente' ty
functional ara'igm
esecially for intero an' soft*are engineering ur
$ut not em$race full No$Kect!orientation
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Expression-oriented
No null MultipleArgs =Tuples
ClosureandCapture
irst-class!alues
Curr"in
%oid
&unit'
ObjectT"pes
(ubt"ping
)ot-notation
Inheritance
MethodO%erloding
Q
*elati%e)eg
&some t"pne
*elati%el" +race$ul)egradation
&some t"pe annotationsneeded'
Functional
O$ Kects
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% l i
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%n analysis 2imon Cousins, Energy ector/
5S4,444lines of C# OO
$y oshore team
54,444lines of ro$ust F#, *itarallel more featur
%n alication to e(aluate the re(enue 'ue from Balancing er(ices contracts in the 9 energy in'ustry
htt.HHsimontcousins)aure*e$sites)netH'oes!the!language!you!use!ma+e!a!'ierence!re(isite'H
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imon Cousins, Energy ector
Uero$ugs in 'eloye' system
NF# is the safe choice for this rany other choice is too ris+y
%n alication to e(aluate the re(enue 'ue from Balancing er(ices contracts in the 9 energy in'ustry
htt.HHsimontcousins)aure*e$sites)netH'oes!the!language!you!use!ma+e!a!'ierence!re(isite'H
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Positi(e ynthesis %chie(e'
some limitations remain" an' there is one area in
that<s *orth 'iscussing")
Functional
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Circularities an' 7o'ularity in th
2%nalysis $y cott Alaschin an' F# Com
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7ixe' OOHFunctional ProgramVas Aon
Lam$'as in C#, Wa(a, C, "%sync mona'ic mo'ality in C#, Wa(ascri
2Vac+/, "
Function tyes in C# Tyecrit
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nnecessary Circularities are E(il
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nnecessary Circularities are E(il
To the functional rogrammer, it is No$(ious soft*are metho'ology shoul' hel minimie a
re'uce c clic 'e en'encies in ro ram struct
The C# aroach to circularity
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The C# aroach to circularity
%ll les in an Nassem$ly are mutually referen
%r$itrary circularity $et*een Ninternal itemsassem$ly
7utually recursi(e Nassem$lies are ossi$le har'
The F# aroach to circularity
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The F# aroach to circularity
Li+e Vas+ell an' OCaml, F# has a le or'erin
F# encourages minimiing 'een'encies *ith
Parameteriation the referre' techni?ue
F# o$Kects suort limite' forms of circularitynee'e'
Let<s analyse some C# an' F#
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Let s analyse some C# an' F#roKects
Let<s analyse some C# an' F#
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Let s analyse some C# an' F#roKects
F# co'e has fe*
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le(el 'een'enc
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Ahy the 'ierence $etF#
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F#
1n C#, there is nothing from creating cycles) 1nha(e to ma+e a secia
a(oi' them)
1n F#, you canXt easily at all)
(pec
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(pec
Tic/l
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Tic/l
Tic+
7icro
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Tic+
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1n theory an' in ractice, unmo'erate'
comonent cycles are a 'isaster
Language mechanisms that enforce acyclNgoo'
There are signicant unresol(e' tensions the maKor in'ustrial languages
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Pattern
7atching
%$stra
n
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Enter F# %cti(e Patterns"
2imilar to cala extractors, 'esigne' at the same time in loose c
%cti(e Patterns in F#
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let m l'i&*ect c1 c2 =m &tch c1+c2 w ith , *ect(&r+&i)+ *ect(br+bi)->
re&te*ect(&rbr - &ibi+ &ibr / bi&r)
let (,*ect,) (x:com plex) = (x.*e&l+ x.Im &"i%&r$)let (,Pol&r,) (x:com plex) = (x.M &"%it!e + x.Ph&0e)
T*o (ie*s on comlex nu
let m l'i&Pol&r c1 c2 =m &tch c1+c2 w ith , Pol&r(r1+th1)+Pol&r(r2+th2)->
re&tePol&r(r1r2+ th1/ th2)
let m l'i&*ect (*ect(&r+&i)) (*ect(br+bi)) = re&te*ect(&rbr - &ibi+ &ibr / bi&r)let m l'i&Pol&r (Pol&r(r1+th1)) (Pol&r(r2+th2)) = re&tePol&r(r1r2+ th1/ th2)
These tags areNacti(e recognier
la$els
These tags areNacti(e recognier
la$els
The *hole functionis an Nacti(erecognier)
The *hole functionis an Nacti(erecognier)
They are Kust or'inafunctions *ith N$ana
names
They are Kust or'inafunctions *ith N$ana
names
The use of acti(erecognier la$els
imlicitly selectan' aly thefunction
The use of acti(erecognier la$els
imlicitly selectan' aly thefunction
(,*ect,)(,Pol&r,)
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mo!le &0icP&tter%0 =
let (,'&l e, ,) (e Sh&rp3 pr)
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let (,'&le,,) (e:Sh&rp3xpr) = ...
let (,o%0t,,) (e:Sh&rp3xpr) = ...
let (,#$pe4&mb!&,,) (e:Sh&rp3xpr) = ...
let (,4&mb!&,,) (e:Sh&rp3xpr) = ...
let (,5pplic&tio%,,) (e:Sh&rp3xpr) = ...
let (,I6#he%3l0e,,) (e:Sh&rp3xpr) = ...
let (,4et,,) (e:Sh&rp3xpr) = ...
let (,4et*ec,,) (e:Sh&rp3xpr) = ...
let (,7ew*ecor!,,) (e:Sh&rp3xpr) = ...
let (,7ew8%io%&0e,,) (e:Sh&rp3xpr) = ...
let (,7ew#ple,,) (e:Sh&rp3xpr) = ...
let (,#ple9et,,) (e:Sh&rp3xpr) = ...
let (,I!e%ti6ier7&meS$%t&x,,) (%: Sh&rpS$%t&x7o!e) =
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m&tch % with , : I!e%ti6ier7&meS$%t&x &0 t -> Some(t.Sh&rp;i%!()+t.I!e%ti6ier) , -> 7o%e
let (,I!e%ti6ier7&me,,) (%: Sh&rpS$%t&x7o!e) = m&tch %.Sh&rp;i%!() with , S$%t&x;i%!.I!e%ti6ier7&me -> ... , -> 7o%e
let (,<&li6ie!7&meS$%t&x,,) (%: Sh&rpS$%t&x7o!e) = m&tch % with , : <&li6ie!7&meS$%t&x &0 t -> ...
, -> 7o%e
let (,<&li6ie!7&me,,) (%: Sh&rpS$%t&x7o!e) = m&tch %.Sh&rp;i%!() with , S$%t&x;i%!.<&li6ie!7&me -> ... , -> 7o%e
Pattern7atching
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Relaxation %chie(e' ;
%n extremely useful mechanism that greatly ex
utility of attern matching in the languag
Don<t lea(e home *ithout them
7atching
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Co'e Dat1n one large
comany, GS44eole *or+ on
tooling for this
"an' Seole *
tooling f
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Ae are li(ing through ainformation re(olution
The 1nformation Re(olution
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3 5 S Z [
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Ae nee' to $ring information intlanguage"
%t internet-scale, strongl" tooled, strot"ped
Para'igm Locator
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Options
• ma/e staticall" t"ped langmore d"namic
• ma/e d"namicall" t"pedlangs more static
• appl" moderated static
t"ping much more broadl"
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htt.HHfshar)githu$)ioHFhar)DataHimages
htt.HHfshar)githu$)ioHFhar)DataHimage
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Enter . T"pe 0ro%iders12
NWust li+e a li$rary
N% 'esign!time comonent that comutes a sace of
metho's on!'eman'"
N%n a'ator $et*een 'ataHser(ices an' the )ET tye s
NOn!'eman', scala$le comile!time ro(ision of tye'enitions"
Theme # ! 7any Data ources, O7 h i
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7echanism
t"pes
egoe 1 Light
IL #
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H33HZ Z
IL #3
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H33HZ Z
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H33HZ Z
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H33HZ [
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H33HZ [
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H33HZ [
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H33HZ [
Entity &rahs
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H33HZ [
ADL
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H33HZ [
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H33HZ [
Theme #3 ! Data at 7ultile ca
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From E(erything to 1n'i(i'uals
d$t$.llnt&te!
Data criters ne*or+ *ith 'ier
granularities schematiatio
d$t$.utomot&ve.utomob&le odel!
d$t$.utomot&ve.utomob&le odel!.-nd&v&du$l!.or!ce /
"Only a language thatsuorts massi(ely scala$lemeta'ata can oerate at all
these le(els
E(ery staentity c
get a untye
“The idea of integrating interne
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information services directly i program's ariable and type space is pr
the most innovative programlanguage idea I!e heard of in a de
# Wim Cor'y, Iu
O(erly +in', $ut thought ro
Co'e
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Relaxation %chie(e' ; ;
F# Tye Pro(i'ers ha(e $een a hugely successful featurange of useful alication is enormous) They $ring '
tye' rogramming into synthesis li+e no other featur
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0 -
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ync %syn
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um$ersum$
*ith
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&P CP
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Ahat<s %hea'
Aell, for me, many areas of tension in Nu
language 'esign ha(e $een resol(e
But there are still some areas that $ug
Distri$
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REPLDistri$
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Ro*s Colum
e)g) Trill ! 6LDB ]S
1n ConclusionFunctional
O$Kects ync
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Co'e Data
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e "
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