standard.txt

*Numbers
=3 + 2
=3 - 2
=3 * 2
=3 / 2
=3 ^ 2
=3 ** 2.5

div 3 2
mod 3 2
m

max 3 4
min 3 4
abs (-3)

odd 3
even 3
gcd 4 6
lcm 4 6

floor 3.6
round 3.6
ceiling 3.6

sum [1..5]
product [1..5]

maximum [1,3,2]
minimum [1,3,2]

pi
sqrt 2
sin 0.4
cos 0.4
m

*Booleans
=3 > 2
=3 >= 2
=3 < 2
=3 <= 2
=3 == 2
=3 /= 2

=True && False
=True || False
not True

and [False, False, True]
or [False, False, True]

*Constructing Lists
='h' : "ello"
="he" ++ "llo"
replicate 3 'a'

concat ["he", "ll", "o"]
m

intersperse ',' "abc"
intercalate "--" ["one", "two"]

*Querying Lists
null "abc"
length "abc"

elem e "hello"
find odd [2,4,5,6]
m
--lookup 4 [(3, "hey"), (4, "ho")]

isPrefixOf "he" "hello"
m

FindIndex odd [2,3,5]
FindIndices odd [2,3,5]

t
*Extracting from Lists
="hello" !! 4

head "abc"
tail "abc"
init "abc"
last "abc"

take 2 "hello"
drop 2 "hello"

takeWhile odd [1,3,2]
dropWhile odd [1,3,2]

stripPrefix "he" "hello"

*Splitting Lists
splitAt 2 "hello"
span odd [1,3,4]
break even [1,3,4]

partition odd [1,2,3,4]

*Infinite lists
iterate (+1) 0
repeat 'a'
cycle "hello"

*Lists as sets
nub "mississippi"

delete 'e' "hello"

="ab" \\ "ac"
union "ab" "ac"
m

*Sorting
sort [3,4,2]
m
insert 3 [1,2,4]
m
compare 3 4

*Misc Lists
zip [1..] "hello"
zipWith (+) [1,2,3] [4,5,6]
m

unzip [(4,'a'),(5,'z')]
m

reverse "hi"
transpose ["abc", "123"]

subsequences "abc"
permutations "abc"

group "hello"

inits "abc"
tails "abc"

t
*Strings
lines "one\ntwo\n"
unlines ["one", "two"]

words "one two"
unwords ["one", "two"]

show 3
read "3"
*Characters
toUpper 'a'
toLower 'A'

digitToInt '5'
intToDigit 5

ord 'A'
chr 65

isNumber '4'
isLetter 'a'
m

*Higher order
map sqrt [1..5]
filter odd [1..5]

all odd [2,3,4]
any odd [2,3,4]

=sqrt . sqrt
=sqrt $ 4
flip take

foldr (+) 0 [1..5]
foldl' (+) 0 [1..5]
m

scanr (+) 0 [1..5]
scanl' (+) 0 [1..5]
m

*I/O
main
interact $ map toUpper

putChar 'a'
putStr "hi"
putStrLn "hi"
print 4

getchar
getLine
getContents

readFile "a.txt"

writeFile "a.txt" "hello"
appendFile "a.txt" "hello"
*Misc
fst (3,"hi")
snd (3,"hi")
id 3
const 3 "hi"