今日は 第5章:高階関数 折り畳み見込みありの途中まで (位置 1987/11175)読み進めました。
いままで出てきた関数
5 + 2 == 8 5 * 2 == 10 5 - 2 == 3 5 / 2 == 2.5 ( True || False ) == True ( True && False ) == False not True == False succ 'c' == 'd' min 4 5 == 4 max 'a' 'z' == 'z' div 92 3 == 30 mod 14 5 == 4 [1,2,3] ++ [4,5] == [1,2,3,4,5] 'a':" long time" == "a long time" "abcdef" !! 2 == 'c' ( [1,2,3] < [1,2,4] ) == True ( "bbc" > "abc" ) == True ( [1,2,3] <= [1,2,4] ) == True ( "bbc" >= "abc" ) == True ( "abc" == "abc" ) == True (1.0 /= 1.5) == True head [1..] == 1 tail [1,2,3] == [2,3] init [1,2,3,4] == [1,2,3] length ['a'..'z'] == 26 null [] == True reverse [1,2,3] == [3,2,1] take 3 [1..] == [1,2,3] drop 7 [1..10] == [8,9,10] maximum [1,10,2] == 10 minimum [3,2,4] == 2 sum [1,10,100] == 10 product [2,3,4] == 24 elem 4 [1,2,3,4,5] == True take 10 ( cycle "abc") == "abcabcabca" take 5 ( repeat 'x') == "xxxxx" replicate 5 'x' == "xxxxx" odd 5 == True even 8 == True fst (1,'A') == 1 snd (1,'A') == 'A' zip [1..] "ABC" == [(1,'A'),(2,'B'),(3,'C')] show 4.25 == "4.25" (read "4" :: Int) == 4 (minBound :: (Bool, Int, Char)) == (False,-9223372036854775808,'\NUL') (maxBound :: (Bool, Int, Char)) == (True,9223372036854775807,'\1114111') fromIntegral (div 5 3) + 1.5 == 2.5 compare 1 2 == LT zipWith (*) [1..3] [10,20,30] == [10,40,90] flip (++) "DEF" "ABC" == "ABCDEF" map (10-) [1..3] == [9,8,7] filter (<3) [1..10] == [1,2] takeWhile (/= 'd') "abracadabra" == "abraca" foldl (-) 10 [1,2] == 7 foldr (-) 10 [1,2] == 9 foldl1 (-) [10,1,2] == 7 foldr1 (-) [1,2,10] == 9 and [True, False, True] == False or [True, False, True] == True
LL 言語に比べて、同じような作用をする関数でも対象が違うと別な名前 (fst と head とか max と maximum が別関数とか) なので、関数の数がおおいなあと思いました。
