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Screwdriver

A dart package aiming to provide useful extensions and helper functions to ease and speed up development.

• 📋 Well Documented
• ⚔️ Fully Tested
• 👌 Follows Code Quality Guidelines
• 🦾 Production Ready
• collection included for extra extensions.

Stats

Check out EXTENSIONS.md for a complete list of all the available extensions.

Extensions:                    322
Extension Types:               4
Helper Classes:                5
Helper Functions & Getters:    29
Typedefs:                      10
Mixins:                        2

Last Updated: Fri, Aug 28, 2026 - 04:14 PM

Stats auto generated using Github Workflow.

To checkout all the available extensions, helper functions & classes, see documentation.

Installation

1. Add as a dependency in your project's pub spec.yaml.

dependencies:
  screwdriver: <latest_version>

Note: Screwdriver exports collection package as well. So, you don't need to add collection as a dependency in your project.

2. Import library into your code.

import 'package:screwdriver/screwdriver.dart';

3. Use this import for using IO extensions.

import 'package:screwdriver/screwdriver_io.dart';

A Glimpse of Screwdriver

String

'hello'.capitalized; // Hello
'   '.isBlankl // true;
'45'.toIntOrNull(); // 45
'html'.wrap('<','>'); // <html>
'1010111010001'.isBinary; // true
'test@example.com'.isEmail; // true
'abcd'.reversed; // dcba
'This is a test'.words; // ['this', 'is', 'a', 'test']
'{"name":"John"}'.parseJson(); // map: {name:John}
'#hello'.removePrefix('#'); // hello

Map

final Map<String, dynamic> map = {
  'name': 'John',
  'age': 24,
};

for(final (key, value) in map.records) {
  print('$key: $value');
}

Int

20.isDivisibleBy(5); // true
0.asBool; // false
6.twoDigits; // '06'
2020.isLeapYear; // true
10.repeat((count) => print(count));

DateTime & Duration

now().isMonday;
final DateTime fiveDaysAgo = 5.daysAgo;
final Duration nineMinutes = 9.minutes;
45.minutes.isInHours; // false
15.daysAgo < 5.days.ago; // true
20.minutes.ago >= 50.minutes.ago; // true
now().previousDay; // yesterday
10.days.ago.isBetween(15.days.ago, now()); // true

Double and Bool

randomDouble(max: 50); // random double value between 0 and 50
56.0.isWhole; // true
true.toggled; // false
false.toInt(); // 0

Scope Functions

final User user = User(name: 'John').apply((user){
  user.age = 24;
  user.email = 'john@doe.com';
});
final String age = user.run((u)=> (u.age + 20).toString());

Collections

users << User(name: 'John'); // appends user to users list
users.firstOrNull;
users.drop(5);
users.takeLast(3);
user.all((u) => u.age > 18); // returns bool
cars.groupBy((car) => car.color);
cars.count((car) => car.isPorsche);
cars.random();
cars.maxBy((car) => car.price);
cars.intersect(otherCars);
{'name': 'John'} << Pair('email','john@doe.com');

Future

postDelayed(2000,(){
  print('after 2 seconds');
});

IO

file.onModified(() => print('file modified'));
file.clear(); // flushes all the data of file
file.isEmpty;
file.appendString('hello');
file << 'some text';
file1 + file2; // appends file2 content at the end of file1

Some More

check(divider != 0);
runCaching((){
  count / 0;
});
TODO('find a way to implement this properly'); // throws UnimplementedError on invocation
Triple(45,true, 'Hello World');
user.takeIf((u) => u.age > 18)?.allowAccess();
person.takeUnless((p) => p > 18)?.areTeenagers();
final DateTime date = tomorrow;
yesterday.isInDecember;

Check out EXTENSIONS.md for a complete list of all the available extensions.

Checkout documentation for more details.

Features and bugs

Please file feature requests and bugs at the issue tracker.

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License

Copyright (c) 2020, Birju Vachhani
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this
   list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

3. Neither the name of the copyright holder nor the names of its
   contributors may be used to endorse or promote products derived from
   this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.