Bool.Extra

Convenience functions for working with Bools

Basics

all : List Bool -> Bool

All the bools are true.

all [ True, True ] == True
all [ True, False ] == False
all [ False, False ] == False

none : List Bool -> Bool

None of the bools are true.

none [ True, True ] == False
none [ True, False ] == False
none [ False, False ] == True

any : List Bool -> Bool

At least one of the bools is true.

any [ True, True ] == True
any [ True, False ] == True
any [ False, False ] == False

notAll : List Bool -> Bool

Not all of them are true

notAll [ True, True ] == False
notAll [ True, False ] == True
notAll [ False, False ] == True

ternary : a -> a -> Bool -> a

A substitue for the if statement that can be used in in a pipeline.

users
    |> List.isEmpty
    |> ternary "Empty" "Not Empty"
    |> Html.text

Generally a regular if statement should work fine, but some times in complicated piping an if statement breaks the flow

allPass : List (a -> Bool) -> a -> Bool

Determine if all predicates are satisfied by the value.

allPass [(>) 20, (<) 10] 11 == True
allPass [(>) 20, (<) 10] 21 == False
allPass [(>) 20, (<) 10] 4 == False
allPass [] 21 == True

anyPass : List (a -> Bool) -> a -> Bool

Determine if any predicate is satisfied by the value.

anyPass [(>) 20, (<) 10] 100 == True
anyPass [(>) 20, (==) 10] 21 == False
anyPass [] 21 == False