@airtasker/form-schema-compiler/lib/interpreter/evaluateUnaryExpression.js

a form schema compiler

"use strict";

exports.__esModule = true;

var _const = require("../const");

var evaluateUnaryExpression = function evaluateUnaryExpression(_ref, env, evaluate) {
  var operator = _ref.operator,
      argument = _ref.argument;

  switch (operator) {
    case _const.OPERATORS.Not:
      return !evaluate(argument, env);

    case _const.OPERATORS.Add:
      return +evaluate(argument, env);

    case _const.OPERATORS.Subtract:
      return -evaluate(argument, env);

    default:
      throw new Error("wrong UnaryExpression ".concat(JSON.stringify({
        operator: operator,
        argument: argument
      })));
  }
};

exports["default"] = evaluateUnaryExpression;