built_collection/lib/src/internal/iterables.dart

// Copyright (c) 2019, Google Inc. Please see the AUTHORS file for details.
// All rights reserved. Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

import 'package:built_collection/src/iterable.dart' show BuiltIterable;

/// Evaluates a lazy iterable.
///
/// Known non-lazy types are returned directly instead.
Iterable<E> evaluateIterable<E>(Iterable<E> iterable) {
  if (iterable is! List && iterable is! BuiltIterable && iterable is! Set) {
    iterable = iterable.toList();
  }
  return iterable;
}