A named value with a type used during expression validation and evaluation.

Variables are stored on a Elex.Context and referenced in expressions by name. The :type field drives type checking in Elex.Validator; the :value field is returned by Elex.Evaluator.

Fields

• :type - One of :decimal, :boolean, :string, :percent, nil, :unknown, or a unit category atom such as :length
• :value - The runtime value (Decimal.t(), boolean(), String.t(), Elex.Percent.t(), {number, unit} or Elex.Quantity.t() for a categorized quantity, etc.)

Examples

%Elex.Variable{value: Decimal.new("3.14"), type: :decimal}
%Elex.Variable{value: true, type: :boolean}
%Elex.Variable{value: "hello", type: :string}
%Elex.Variable{value: %Elex.Percent{value: Decimal.new("50")}, type: :percent}

Use Elex.add_variable/3 to infer the type from a value.