Documentation

Like tails, but only the non-empty tails from a non-empty list. The result is non-empty because every non-empty list has at least one non-empy suffix (itself).

>>> neTails (1 :| [])
(1 :| []) :| []

>>> neTails ('a' :| "bc")
('a' :| "bc") :| ['b' :| "c",'c' :| ""]

Sublists of a fixed length.

>>> sliding 2 "abcd"
["ab","bc","cd"]

>>> sliding 3 "abcde"
["abc","bcd","cde"]

>>> transpose ["abc","def"]
["ad","be","cf"]

>>> untilNothing [Just 1, Just 2, Nothing, Just 3]
[1,2]

maximumOn f is equivalent to maximumBy (compare `on' f), but is more efficient when f is costly.

The number of unique elements in a list.

>>> countDistinct []
0

>>> countDistinct "aaaaabaa"
2

The most common element in the list, assuming the list is nonempty and has a single most common element.

>>> mode "abbbbcc"
'b'

Remove consecutive duplicate elements from a list.

>>> dedupe []
[]

>>> dedupe "abbbbcca"
"abca"

>>> adjustEach toUpper "abc"
["Abc","aBc","abC"]

>>> adjustEach id []
[]

>>> adjustIndex 2 toUpper "abcd"
"abCd"