Validate.jd

function validateObject(obj, requiredKeys, checkForNullUndefined = true) {
  const validationErrors = requiredKeys
    .map(key => (!obj.hasOwnProperty(key) ? `Field: ${key} is missing` : null))  // Check for missing fields
    .concat(
      checkForNullUndefined
        ? Object.keys(obj)
            .map(key => (obj[key] === null || obj[key] === undefined ? `Field: ${key} has an invalid value (null or undefined)` : null))
        : []
    ) // Optional check for null/undefined (conditional with map)
    .reduce((errors, error) => error ? errors.concat(error) : errors, []); // Concatenate only non-null error messages

  if (validationErrors.length > 0) {
    console.error("User understanding statement validation errors:\n", validationErrors.join("\n"));
  }

  return validationErrors.length === 0;
}

// Example usage (same as before)