# [a] -> (a -> Bool) -> a

The find function takes a predicate and a list and returns the first element in the list matching the predicate, or Nothing if there is no such element.
dropWhile p xs returns the suffix remaining after takeWhile p xs: > dropWhile (< 3) [1,2,3,4,5,1,2,3] == [3,4,5,1,2,3] > dropWhile (< 9) [1,2,3] == [] > dropWhile (< 0) [1,2,3] == [1,2,3]
filter, applied to a predicate and a list, returns the list of those elements that satisfy the predicate; i.e., > filter p xs = [ x | x <- xs, p x]
takeWhile, applied to a predicate p and a list xs, returns the longest prefix (possibly empty) of xs of elements that satisfy p: > takeWhile (< 3) [1,2,3,4,1,2,3,4] == [1,2] > takeWhile (< 9) [1,2,3] == [1,2,3] > takeWhile (< 0) [1,2,3] == []
Applied to a predicate and a list, all determines if all elements of the list satisfy the predicate. For the result to be True, the list must be finite; False, however, results from a False value for the predicate applied to an element at a finite index of a finite or infinite list.
Applied to a predicate and a list, any determines if any element of the list satisfies the predicate. For the result to be False, the list must be finite; True, however, results from a True value for the predicate applied to an element at a finite index of a finite or infinite list.
Direct MonadPlus equivalent of filter filter = (mfilter:: (a -> Bool) -> [a] -> [a] applicable to any MonadPlus, for example mfilter odd (Just 1) == Just 1 mfilter odd (Just 2) == Nothing
The find function takes a predicate and a structure and returns the leftmost element of the structure matching the predicate, or Nothing if there is no such element.
until p f yields the result of applying f until p holds.
Determines whether all elements of the structure satisfy the predicate.
Determines whether any element of the structure satisfies the predicate.
Apply a transformation everywhere in bottom-up manner
Apply a transformation everywhere in top-down manner
Deprecated: use escapeURIString, and note the flipped arguments
The findIndex function takes a predicate and a list and returns the index of the first element in the list satisfying the predicate, or Nothing if there is no such element.
The findIndices function extends findIndex, by returning the indices of all elements satisfying the predicate, in ascending order.
Can be used to make a string valid for use in a URI.
The sortWith function sorts a list of elements using the user supplied function to project something out of each element
map f xs is the list obtained by applying f to each element of xs, i.e., > map f [x1, x2, ..., xn] == [f x1, f x2, ..., f xn] > map f [x1, x2, ...] == [f x1, f x2, ...]
Throw an IOError corresponding to the current value of getErrno if the result value of the IO action meets the given predicate.