lookaround_iterator 1.0.1

  • README.md
  • Installing
  • Versions
  • 47

Dart lookaround iterator

The LookaroundIterator class exposes a fixed number of elements in the past and future of the current iteration element.

// `it` is an iterator over a list of the numbers 1..10, currently
// pointing at `4`.
final it = new LookaroundIterator(
    new List.generate(10, (n) => n + 1).iterator,
    lookbehind: 2,
    lookahead: 3)

// Prints _2, 3, 4, 5, 6, 7_.
// Notice the negative start index and the inclusive range `<=`.
for (int i = -it.lookbehind; i <= it.lookahead; i++) {



  • Cosmetic changes to appease pana: Add analysis_options.yaml and CHANGELOG.md.
  • Fix strong_mode and linter warnings.
  • Update repository name in pubspec.yaml.


  • Initial version.

Use this package as a library

1. Depend on it

Add this to your package's pubspec.yaml file:

  lookaround_iterator: ^1.0.1

2. Install it

You can install packages from the command line:

with pub:

$ pub get

with Flutter:

$ flutter packages get

Alternatively, your editor might support pub get or flutter packages get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:

import 'package:lookaround_iterator/lookaround_iterator.dart';
Version Uploaded Documentation Archive
1.0.1 Dec 6, 2017 Go to the documentation of lookaround_iterator 1.0.1 Download lookaround_iterator 1.0.1 archive
1.0.0 Aug 13, 2017 Go to the documentation of lookaround_iterator 1.0.0 Download lookaround_iterator 1.0.0 archive
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Code health derived from static analysis. [more]
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Learn more about scoring.

We analyzed this package on Oct 10, 2018, and provided a score, details, and suggestions below. Analysis was completed with status completed using:

  • Dart: 2.0.0
  • pana: 0.12.4


Detected platforms: Flutter, web, other

No platform restriction found in primary library package:lookaround_iterator/lookaround_iterator.dart.

Maintenance issues and suggestions

Add SDK constraint in pubspec.yaml. (-5 points)

For information about setting SDK constraint, please see https://www.dartlang.org/tools/pub/pubspec#sdk-constraints.

Maintain an example. (-10 points)

Create a short demo in the example/ directory to show how to use this package. Common file name patterns include: main.dart, example.dart or you could also use lookaround_iterator.dart.


Package Constraint Resolved Available
Dev dependencies
test ^0.12.0