sprintf 4.0.0

  • README.md
  • Installing
  • Versions
  • 82


Dart implementation of sprintf.

Build Status


v4.0.0 (2018-07-02)

* **Breaking change** (#13)
  As of dart 2, int types are going to be fixed width, and the width depends on
  implementation (dart2js vs dartvm). Dart started warning about constants that
  are greater than the max int of javascript. To fix that, this patch will limit
  int (when formatted as hex or octal) to the max limit of javascript (2**53 - 1).
  Any int outside of the +-(2**53 -1) range is not guaranteed to format correctly!

v3.0.2 (2017-08-17)

* Fixed bad publish

v3.0.1 (2017-08-17)

* Fixed weak typing which stopped dartdevc from working (#11 thanks @bergwerf)

v3.0.0 (2017-04-20)

* Fixed rounding of floats, again. Bumping major version because it's different from previous behaviour

v2.0.0 (2017-03-23)

* Fixed rounding of floats. Bumping major version, because previous behaviour was to always round down.

v1.1.1 (2016-11-16)

* Updated to use `test` library since `unittest` has been deprecated. 

v1.1.0 (2014-08-21)

* **API change**: Any object with a valid `toString` method can be formatted with `'%s'` (#7)

v1.0.9 (2013-12-15)

* Round numbers when they're truncated. (#6)

v1.0.8 (2013-10-08)

* Remove trailing decimal point if there are no following digits (#6)

v1.0.7 (2013-05-07)

* Update for new dart version

v1.0.6 (2013-04-16)

* Update for new dart version

v1.0.5 (2013-03-25)

* Fixed dependencies example in README (#5)

v1.0.4 (2013-03-21)

* Update for new dart version

* Update for new pubspec format

v1.0.3 (2013-02-12)

* Update for dart M2

v1.0.2 (2013-01-21)

* Pubspec and whitespace fixes

v1.0.1 (2012-11-12)

* Update for new dart version

v1.0.0 (2012-10-08)

First release with semver

Getting Started

Add the following to your pubspec.yaml:

  sprintf: "^3.0.0"

then run pub install.

Next, import dart-sprintf:

import 'package:sprintf/sprintf.dart';


import 'package:sprintf/sprintf.dart';

void main() {
	print(sprintf("%04i", [-42]));
	print(sprintf("%s %s", ["Hello", "World"]));
	print(sprintf("%#04x", [10]));
Hello World


  • Negative numbers are wrapped as 64bit ints when formatted as hex or octal.

Differences to C's printf

  • When using fixed point printing of numbers with large exponents, C introduces errors after 20 decimal places. Dart-printf will just print 0s.

Use this package as a library

1. Depend on it

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

  sprintf: ^4.0.0

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:sprintf/sprintf.dart';
Version Uploaded Documentation Archive
4.0.0 Jul 28, 2018 Go to the documentation of sprintf 4.0.0 Download sprintf 4.0.0 archive
3.0.2 Aug 18, 2017 Go to the documentation of sprintf 3.0.2 Download sprintf 3.0.2 archive
3.0.1 Aug 18, 2017 Go to the documentation of sprintf 3.0.1 Download sprintf 3.0.1 archive
3.0.0 Apr 20, 2017 Go to the documentation of sprintf 3.0.0 Download sprintf 3.0.0 archive
1.0.8 Oct 9, 2013 Go to the documentation of sprintf 1.0.8 Download sprintf 1.0.8 archive
1.0.7 May 7, 2013 Go to the documentation of sprintf 1.0.7 Download sprintf 1.0.7 archive
1.0.6 Apr 16, 2013 Go to the documentation of sprintf 1.0.6 Download sprintf 1.0.6 archive
1.0.5 Mar 29, 2013 Go to the documentation of sprintf 1.0.5 Download sprintf 1.0.5 archive
1.0.4 Mar 21, 2013 Go to the documentation of sprintf 1.0.4 Download sprintf 1.0.4 archive
1.0.3 Feb 12, 2013 Go to the documentation of sprintf 1.0.3 Download sprintf 1.0.3 archive

All 13 versions...

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Code health derived from static analysis. [more]
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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:sprintf/sprintf.dart.

Health issues and suggestions

Document public APIs (-10 points)

26 out of 26 API elements (library, class, field or method) have no adequate dartdoc content. Good documentation improves code readability and discoverability through search.

Format lib/src/formatters/Formatter.dart.

Run dartfmt to format lib/src/formatters/Formatter.dart.

Format lib/src/formatters/float_formatter.dart.

Run dartfmt to format lib/src/formatters/float_formatter.dart.

Format lib/src/formatters/int_formatter.dart.

Run dartfmt to format lib/src/formatters/int_formatter.dart.

Format lib/src/formatters/string_formatter.dart.

Run dartfmt to format lib/src/formatters/string_formatter.dart.

Format lib/src/sprintf_impl.dart.

Run dartfmt to format lib/src/sprintf_impl.dart.

Maintenance issues and suggestions

Maintain CHANGELOG.md. (-20 points)

Changelog entries help clients to follow the progress in your code.

The description is too short. (-20 points)

Add more detail about the package, what it does and what is its target use case. Try to write at least 60 characters.

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 sprintf.dart.


Package Constraint Resolved Available
Direct dependencies
Dart SDK <3.0.0
Dev dependencies
test any