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하스켈과 타입
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Hong Minhee (洪 民憙)
April 04, 2015
Programming
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1.1k
하스켈과 타입
하스켈과 타입에 대해 설명합니다.
2015년 4월 4일 하스켈 프로그래밍 다섯번째 모임
http://haskell.kr/meetup/2015-04-04/
Hong Minhee (洪 民憙)
April 04, 2015
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Transcript
ೞझுҗ ఋੑ ഘ൞ http://hongminhee.org/
Data type • օܻ ॳח ߣয: ܐഋ • ୶ஏೡ ࣻ
٠, ܐ(data)ܳ ࠙ܨ(type)ೞח Ѫ • Ӓۢ ࠙ܨೠ ܐٜ যڌѱ ࢤӟ Ѫੌө?
Value • օܻ ॳח ߣয: ч • য٥оী ഃࢲ աী
੍൧ ࣻ • ଃীࢲ ଃਵ۽ ೧ ࣻ
Value • օܻ ॳח ߣয: ч • ݫݽܻա ٣झী ೞҊ
աী ৌযࠅ ࣻ • ֎ਕܳ ా೧ ࣠ؼ ࣻ
Value • օܻ ॳח ߣয: ч • ܴয ࣻب Ҋ,
ܴ যڃ чਸ ڷೞחب ঌ ࣻ • ೣࣻ ੋ۽ ٜযт ࣻب Ҋ, ೣࣻ۽ࠗఠ աৢ ࣻب
ч > let factorial n = product [1..n] > let
x = 10 > factorial x 3628800
ܴয ࣻ > let factorial n = product [1..n]
> let x = 10 > factorial x 3628800
ܴ ڷਸ ঌ ࣻ > let factorial n =
product [1..n] > let x = 10 > factorial x 3628800
ೣࣻ ੋ۽ ٜযт ࣻ > let factorial n =
product [1..n] > let x = 10 > factorial x 3628800
ೣࣻ۽ࠗఠ աৢ ࣻ > let factorial n = product
[1..n] > let x = 10 > factorial x 3628800
ч ࢿ • чٜ ݃ ةౠೠ ࢿ • 1
? 2. Ӓۢ 2 ? 3. • ['a', 'b', 'c'] ӡח? 3. • [] ? ݾ۾ೠప ‘’ۆ ަө? • 1 ӡח? ࣻೠప ‘ӡ’ۆ ަө?
ч ࢿ > succ 1 2 > succ 2 3
> length ['a', 'b', 'c'] 3
ч ࢿ > succ ['a', 'b', 'c'] <interactive>:16:1: No instance
for (Enum [Char]) arising from a use of ‘succ’ In the expression: succ ['a', 'b', 'c'] In an equation for ‘it’: it = succ ['a', 'b', 'c']
ч ࢿ > length 1 <interactive>:17:8: No instance for (Num
[a0]) arising from the literal ‘1’ In the first argument of ‘length’, namely ‘1’ In the expression: length 1 In an equation for ‘it’: it = length 1
ܐഋ • чٜ ݃ ةౠೠ ࢿ • Ӓ۞ա ࢿ
൚ࢎೠ Ѫՙܻ ݽইࢲ ࠙ܨೡ ࣻ • ‘’ Ҋ, ف ч ‘’ чٜ ‘эਵݶ’ ف ч ‘эҊ’, ‘؊ೡ ࣻ’ Ҋ, ‘ࡓ ࣻ’ب Ҋ… → ࣻ ܐഋ • 0ѐ ࢚ чਸ ‘ನೣ’ೡ ࣻ Ҋ, ನೣػ чٜ ࢎী ‘ࣽࢲ’ о Ҋ… → ݾ۾ ܐഋ
ܐഋ • ࠺तೠ ࢿ чٜਸ ݽইفݶ ಞܻೞ • о۸, ؔࣅਸ
ೡ ٸ ‘؊ೡ ࣻ ח’ ࢿ чٜ݅ ߉Ҋ र → ࣻ ܐഋ݅ ߉ਵݶ ػ • о۸, іࣻܳ ҳೡ ٸ ‘чਸ ನೣೡ ࣻ ח’ ࢿ чٜ݅ ߉Ҋ र → ݾ۾ ܐഋ݅ ߉ਵݶ ػ
factorial ࣻ݅ ߉ח > factorial ['a', 'b', 'c'] <interactive>:26:1: No
instance for (Num [Char]) arising from a use of ‘factorial’ In the expression: factorial ['a', 'b', 'c'] In an equation for ‘it’: it = factorial ['a', 'b', 'c']
ч ܐഋ (पઁח ࠁ ખ؊ ࠂפ) > let factorial n
= product ([1..n] :: [Integer]) :: Integer > let x = 10 :: Integer > factorial x :: Integer 3628800 :: Integer
ܐഋ ঌইࠁӝ (पઁח ࠁ ખ؊ ࠂפ) > :t x x
:: Integer > :t factorial factorial :: Integer -> Integer
ৈӝࢶ ܖ ঋח ઁ • ࣻ ܐഋ (algebraic data
type) • Parametric polymorphism • ఋੑېझ (typeclass) • ⊥ (bottom) • ӝఋ ١١. ೞ݅ ށۄب ੌױ ೞझு ٬ द оמ
ࠗप೧ࢲ દ࣠פ bit.ly/haskell-kr-2015-04-04-type