lookaround_iterator 1.0.1+1

  • README.md
  • Installing
  • Versions
  • 65

Dart lookaround iterator

Build Status

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 = LookaroundIterator(
    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++) {



  • Add SDK constraint so the package can be used in Dart 2.0.0.
  • Run dartfmt --fix.


  • 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+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+1 Nov 8, 2018 Go to the documentation of lookaround_iterator 1.0.1+1 Download lookaround_iterator 1.0.1+1 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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Learn more about scoring.

We analyzed this package on Dec 5, 2018, and provided a score, details, and suggestions below. Analysis was completed with status completed using:

  • Dart: 2.1.0
  • pana: 0.12.7


Detected platforms: Flutter, web, other

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

Maintenance suggestions

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
Direct dependencies
Dart SDK >=2.0.0 <3.0.0
Dev dependencies
test ^1.0.0