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module Bool
export Bool(..), not/1, compare/2, max/2, min/2
import Order exposing Order(_)
type Bool
= True
| False
fn not(bool) =
case bool
| True => False
| False => True
test not =
not(True) |> Assert.false
not(False) |> Assert.true
fn compare(a, b) =
case (a, b)
| (True, True) => EQ
| (True, False) => GT
| (False, False) => LT
| (False, True) => GT
test compare =
compare(True, True) |> Assert.equal(_, EQ)
compare(True, False) |> Assert.equal(_, GT)
compare(False, False) |> Assert.equal(_, LT)
compare(False, True) |> Assert.equal(_, GT)
fn max(a, b) =
case a
| True => True
| False => b
test max =
max(True, True) |> Assert.equal(_, True)
max(True, False) |> Assert.equal(_, True)
max(False, False) |> Assert.equal(_, False)
max(False, True) |> Assert.equal(_, True)
fn min(a, b) =
case a
| False => False
| True => b
test min =
min(True, True) |> Assert.equal(_, True)
min(True, False) |> Assert.equal(_, False)
min(False, False) |> Assert.equal(_, False)
min(False, True) |> Assert.equal(_, False)
fn to_int(bool) =
case bool
| False => 0
| True => 1
test to_int =
to_int(True) |> Assert.equal(_, 1)
to_int(False) |> Assert.equal(_, 0)
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