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Functional programming abstractions for Elixir (Beta release: APIs may change before 1.0)

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funx lib validator list.ex
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lib/validator/list.ex 

defmodule Funx.Validator.List do

  @moduledoc """

  Validates that a value is a list.



  ## Optional Options



  - `:message` - Custom error message callback `(value -> String.t())`



  ## Examples



      iex> Funx.Validator.List.validate([1, 2, 3])

      %Funx.Monad.Either.Right{right: [1, 2, 3]}



      iex> Funx.Validator.List.validate([])

      %Funx.Monad.Either.Right{right: []}



      iex> Funx.Validator.List.validate("not a list")

      %Funx.Monad.Either.Left{left: %Funx.Errors.ValidationError{errors: ["must be a list"]}}

  """



  use Funx.Validator



  alias Funx.Predicate



  @impl Funx.Validator

  def valid?(value, opts, _env) do

    predicate = Predicate.List.pred(opts)

    predicate.(value)

  end



  @impl Funx.Validator

  def default_message(_value, _opts) do

    "must be a list"

  end

end