Validates that every element in a list passes a given validator (or validators).

Each provides universal quantification over list elements. It applies one or more validators to each element and collects all errors using applicative semantics.

Options

Exactly one of the following must be provided:

• :validator - A single validator to apply to each element
• :validators - A list of validators; each element must pass all of them

Each validator may be:

• A validator module implementing Funx.Validate.Behaviour
• A {Validator, opts} tuple for optioned validators
• A validator function with arity 1, 2, or 3

Semantics

• Uses traverse_a for applicative error collection (all failures reported)
• Empty lists pass validation (vacuous truth)
• Nothing passes through unchanged
• Just(list) unwraps and validates the list

Examples

iex> Funx.Validator.Each.validate([1, 2, 3], validator: Funx.Validator.Positive)
%Funx.Monad.Either.Right{right: [1, 2, 3]}

iex> Funx.Validator.Each.validate([1, 2, 3], validators: [Funx.Validator.Positive, Funx.Validator.Integer])
%Funx.Monad.Either.Right{right: [1, 2, 3]}