Module DA.Tuple¶
Tuple - Ubiquitous functions of tuples.
Functions¶
- first
: (a -> a’) -> (a, b) -> (a’, b)
The pair obtained from a pair by application of a programmer supplied function to the argument pair’s first field.
- second
: (b -> b’) -> (a, b) -> (a, b’)
The pair obtained from a pair by application of a programmer supplied function to the argument pair’s second field.
- both
: (a -> b) -> (a, a) -> (b, b)
The pair obtained from a pair by application of a programmer supplied function to both the argument pair’s first and second fields.
- swap
: (a, b) -> (b, a)
The pair obtained from a pair by permuting the order of the argument pair’s first and second fields.
- dupe
: a -> (a, a)
Duplicate a single value into a pair.
> dupe 12 == (12, 12)
- fst3
: (a, b, c) -> a
Extract the ‘fst’ of a triple.
- snd3
: (a, b, c) -> b
Extract the ‘snd’ of a triple.
- thd3
: (a, b, c) -> c
Extract the final element of a triple.
- curry3
: ((a, b, c) -> d) -> a -> b -> c -> d
Converts an uncurried function to a curried function.
- uncurry3
: (a -> b -> c -> d) -> (a, b, c) -> d
Converts a curried function to a function on a triple.