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lib/predicate/negative.ex
defmodule Funx.Predicate.Negative do
@moduledoc """
Predicate that checks if a number is strictly negative (< 0).
Returns false for non-numbers.
Options
None required.
## Examples
use Funx.Predicate
# Check if balance is negative
pred do
check :balance, Negative
end
# Combined with other predicates
pred do
check :adjustment, IsInteger
check :adjustment, Negative
end
"""
@behaviour Funx.Predicate.Dsl.Behaviour
@impl true
def pred(_opts \\ []) do
fn
number when is_number(number) -> number < 0
_non_number -> false
end
end
end