The printable version is no longer supported and may have rendering errors. Please update your browser bookmarks and please use the default browser print function instead.
A Tour of the Haskell Prelude
- abs
| type: |
abs :: Num a => a -> a
|
| description: |
returns the absolute value of a number.
|
| definition:
|
abs x
| x >= 0 = x
| otherwise = -x
|
| usage:
|
Prelude> abs (-3)
3
|
- all
| type: |
all :: (a -> Bool) -> [a] -> Bool
|
| description: |
Applied to a predicate and a list, returns True if all elements of the list satisfy the predicate, and False otherwise. Similar to the function #any.
|
| definition:
|
all p xs = and (map p xs)
|
| usage:
|
Prelude> all (<11) [1..10]
True
Prelude> all isDigit "123abc"
False
|