¡ p a n d o c - t s l i d y - s f o r _ a _ f e w _ m o n a d s _ m o r e . l h s - o f o r _ a _ f e w _ m o n a d s _ m o r e . h t m l ¡− Õ ¾èw x—¡ g h c i f o r _ a _ f e w _ m o n a d s _ m o r e . l h s ¡− ̃”ô¹¾ 1\|¤9cw㣗¡ oq̃ «ł› ŽÔ™ß ³¾ ýß ç|—¡„… { - # L A N G U A G E F l e x i b l e C o n t e x t s # - } i m p o r t D a t a . M o n o i d i m p o r t C o n t r o l . M o n a d . W r i t e r i m p o r t C o n t r o l . M o n a d . S t a t e i m p o r t C o n t r o l . M o n a d . I n s t a n c e s i m p o r t S y s t e m . R a n d o m
n g : : I n t - > ( B o o l , S t r i n g ) i s B i g G a n g x = ( x > 9 , " C o m p a r e d g a n g s i z e t o 9 " ) * M a i n > i s B i g G a n g 1 9 ( T r u e , " C o m p a r e d g a n g s i z e t o 9 " )
o g ' : : ( a , S t r i n g ) - > - - 5èôx”ß ( a - > ( b , S t r i n g ) ) - > - - ß³ ›– 5èôx”I”ß³S¡ ( b , S t r i n g ) - - 5èôx”ß a p p l y L o g ' ( x , l o g ) f = l e t ( y , n e w L o g ) = f x i n ( y , l o g + + n e w L o g ) * M a i n > ( 3 , " S m a l l i s h g a n g . " ) ` a p p l y L o g ' ` i s B i g G a n g ( F a l s e , " S m a l l i s h g a n g . C o m p a r e d g a n g s i z e t o 9 " ) * M a i n > ( 3 0 , " A f r e a k i n g p l a t o o n . " ) ` a p p l y L o g ' ` i s B i g G a n g ( T r u e , " A f r e a k i n g p l a t o o n . C o m p a r e d g a n g s i z e t o 9 " )
p l y L o g : : ( M o n o i d m ) = > - - Ží¾èß Õç vB y t e S t r i n g v ( a , m ) - > - - Ží¾èßôx”ß ( a - > ( b , m ) ) - > - - ß³ ›– Ží¾èßôx”I”ß³S¡ ( b , m ) - - Ží¾èßôx”ß a p p l y L o g ( x , l o g ) f = l e t ( y , n e w L o g ) = f x i n ( y , l o g ` m a p p e n d ` n e w L o g ) Üö »Í ß Ží¾èß”u—¦Î •¶ß—|¤
k ̊'•×áç”âÆ'³fi¦fifi µS³Sæ|—¡ - - i m p o r t D a t a . M o n o i d t y p e F o o d = S t r i n g t y p e P r i c e = S u m I n t a d d D r i n k : : F o o d - > ( F o o d , P r i c e ) a d d D r i n k " b e a n s " = ( " m i l k " , S u m 2 5 ) a d d D r i n k " j e r k y " = ( " w h i s k e y " , S u m 9 9 ) a d d D r i n k _ = ( " b e e r " , S u m 3 0 ) ¶µ ̊'•fizâÆ'”CÔ»Ó̊—£µ g h c i > ( " b e a n s " , S u m 1 0 ) ` a p p l y L o g ` a d d D r i n k ( " m i l k " , S u m { g e t S u m = 3 5 } ) g h c i > ( " j e r k y " , S u m 2 5 ) ` a p p l y L o g ` a d d D r i n k ( " w h i s k e y " , S u m { g e t S u m = 1 2 4 } ) g h c i > ( ( " j e r k y " , S u m 1 0 ) ` a p p l y L o g ` a d d D r i n k ) ` a p p l y L o g ` a d d D r i n k ( " b e e r " , S u m { g e t S u m = 1 3 9 } ) Ô‾ß Éß + Á¾ÕÉß + òß âª”•w∙”øq¶…
›–; ƒ”Monad ¾ ÕÜ Õ Ufl 9c³:µ|–o—¡ n e w t y p e W r i t e r w a = W r i t e r { r u n W r i t e r : : ( a , w ) } i n s t a n c e ( M o n o i d w ) = > M o n a d ( W r i t e r w ) w h e r e r e t u r n x = W r i t e r ( x , m e m p t y ) ( W r i t e r ( x , v ) ) > > = f = l e t ( W r i t e r ( y , v ' ) ) = f x i n W r i t e r ( y , v ` m a p p e n d ` v ' ) > > = »a p p l y L o g ƒ›zß ¡„ a p p l y L o g Üö ³S|–o¤ ̃¬ ³W r i t e r •|—|¤ r e t u r n » ”Ží¾èß W r i t e r ³¢›–S|–o—¡ i× ¡ g h c i > r u n W r i t e r ( r e t u r n 3 : : W r i t e r S t r i n g I n t ) ( 3 , " " ) g h c i > r u n W r i t e r ( r e t u r n 3 : : W r i t e r ( S u m I n t ) I n t ) ( 3 , S u m { g e t S u m = 0 } )
r t C o n t r o l . M o n a d . W r i t e r l o g N u m b e r : : I n t - > W r i t e r [ S t r i n g ] I n t l o g N u m b e r x = w r i t e r ( x , [ " G o t n u m b e r : " + + s h o w x ] ) m u l t W i t h L o g : : W r i t e r [ S t r i n g ] I n t m u l t W i t h L o g = d o a < - l o g N u m b e r 3 b < - l o g N u m b e r 5 t e l l [ " G o n n a m u l t i p l y t h e s e t w o " ] r e t u r n ( a * b ) g h c i > r u n W r i t e r m u l t W i t h L o g ( 1 5 , [ " G o t n u m b e r : 3 " , " G o t n u m b e r : 5 " , " G o n n a m u l t i p l y t h e s e t w o " ] )
g h c i > : i ( + + ) ( + + ) : : [ a ] - > [ a ] - > [ a ] - - D e f i n e d i n ` G H C . B a s e ' i n f i x r 5 + + |v|{ß xö ( ( ( ( a + + b ) + + c ) + + d ) + + e ) + + f ”øq¶Og ”™•¶›–|—q̃ Øm− |łq
M o n a d ( ( - > ) r ) w h e r e r e t u r n x = \ _ - > x h > > = f = \ w - > f ( h w ) w h »( m a ) fi—ß9c ¡ w ³t¡ gp³S|—¡ 9c¶” ¤ßÚ ¡„ f »( a - > m b ) ̃̃ »( h w ) ”Sægp³a •ï¾ è|– 9c( m b ) ³w |øq |—¡ ³›–Æ—¡ a d d S t u f f : : I n t - > I n t a d d S t u f f = d o a < - ( * 2 ) b < - ( + 1 0 ) r e t u r n ( a + b ) g h c i > a d d S t u f f 1 0 0 3 1 0
C o n t r o l . M o n a d . S t a t e t y p e S t a c k = [ I n t ] p o p : : S t a t e S t a c k I n t p o p = s t a t e $ \ ( x : x s ) - > ( x , x s ) p u s h : : I n t - > S t a t e S t a c k ( ) p u s h a = s t a t e $ \ x s - > ( ( ) , a : x s ) s t a c k S t u f f : : S t a t e S t a c k ( ) s t a c k S t u f f = d o a < - p o p i f a = = 5 t h e n p u s h 5 e l s e d o p u s h 3 p u s h 8 g h c i > r u n S t a t e s t a c k S t u f f [ 9 , 0 , 2 , 1 , 0 ] ( ( ) , [ 8 , 3 , 0 , 2 , 1 , 0 ] )
i n s : : S t d G e n - > ( B o o l , B o o l , B o o l ) t h r e e C o i n s g e n = l e t ( f i r s t C o i n , n e w G e n ) = r a n d o m g e n ( s e c o n d C o i n , n e w G e n ' ) = r a n d o m n e w G e n ( t h i r d C o i n , n e w G e n ' ' ) = r a n d o m n e w G e n ' i n ( f i r s t C o i n , s e c o n d C o i n , t h i r d C o i n ) ̃q̈¦—¡ r a n d o m S t : : ( R a n d o m G e n g , R a n d o m a ) = > S t a t e g a r a n d o m S t = s t a t e r a n d o m t h r e e C o i n s : : S t a t e S t d G e n ( B o o l , B o o l , B o o l ) t h r e e C o i n s = d o a < - r a n d o m S t b < - r a n d o m S t c < - r a n d o m S t r e t u r n ( a , b , c ) ] ̀³t|–m}− ̧¾”Ͼ ³çÕ|—¡ g h c i > r u n S t a t e t h r e e C o i n s ( m k S t d G e n 3 3 ) ( ( T r u e , F a l s e , T r u e ) , 6 8 0 0 2 9 1 8 7 2 1 0 3 4 1 0 2 6 3 )
M o n a d m ) = > m ( m a ) - > m a j o i n m m = d o m < - m m m g h c i > j o i n ( J u s t ( J u s t 9 ) ) J u s t 9 g h c i > j o i n ( J u s t N o t h i n g ) N o t h i n g g h c i > j o i n N o t h i n g N o t h i n g g h c i > j o i n [ [ 1 , 2 , 3 ] , [ 4 , 5 , 6 ] ] [ 1 , 2 , 3 , 4 , 5 , 6 ] g h c i > r u n W r i t e r $ j o i n ( W r i t e r ( W r i t e r ( 1 , " a a a " ) , " b b b " ) ) ( 1 , " b b b a a a " ) À ́<O•»ìÕç|¤Maybe ³— Ł−”•øz³o—¡Á
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![Og ( [ 1 , 2 , 3 ] +](https://files.speakerdeck.com/presentations/5053001044db0130303922000a1f82ef/slide_18.jpg){kind=link}
