🧰 Flutter Extension Utils

Extensions that just make sense.

A handy collection of Dart and Flutter extension methods to supercharge your development experience — clean syntax, reusable logic, and expressive code, all in one lightweight package.

Designed to save you time, reduce boilerplate, and improve readability across widgets, strings, numbers, booleans, and BuildContext.

🔌 Installation & Setup

The package can be installed using the command

flutter pub add mayr_extensions

And can then be imported using

import 'package:mayr_extensions/mayr_extensions.dart';

🚀 Features

🧱 BuildContext Extensions

• form – Easily access the nearest FormState using context.form.

• navigator – Shorthand for Navigator.of(context).

• overlay – Access the current OverlayState from the context.

• scaffold – Retrieve the nearest ScaffoldState with context.scaffold.

ScaffoldMessenger

• scaffoldMessenger – Quickly get the ScaffoldMessengerState for showing snackbars and more.

• void showSnackBar(String content, {Duration? duration, SnackBarBehavior behavior = SnackBarBehavior.fixed}) - Quickly show a SnackBar without manually accessing ScaffoldMessenger.

Media Query

• mediaQuery – Access MediaQueryData from context.

• platformBrightness – Get the system's brightness setting (Brightness.dark or Brightness.light).

• platformInDarkMode | platformInLightMode – Returns true based on the app's current brightness mode.

• widgetSize – Get the rendered size of the widget associated with the context.

• widgetHeight – Convenience getter for just the height of the widget.

• widgetWidth – Convenience getter for just the width.

Media Query Orientation

• orientation – Access the current screen orientation (portrait or landscape).

• isLandscape / isPortrait – Easy checks for current orientation.

• widgetShortestSide – Useful for responsive layouts based on the device's shortest screen edge.

• isPhone – Returns true if the device is considered a phone.

• isSmallTablet, isLargeTablet – Classify tablets based on width.

• isTablet – Shortcut combining both small and large tablets.

• isDesktop – Detects larger screens, typically desktops.

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✅ Bool Extensions

• choose(trueValue, falseValue) – Returns trueValue if the boolean is true, otherwise returns falseValue.
• toInt() – Converts the boolean to an integer (1 for true, 0 for false).
• toYesNo({trueString, falseString}) – Converts to a string representation with customizable values.
• not – Returns the negation of the boolean (equivalent to !this).

// Examples
true.choose('Active', 'Inactive'); // 'Active'
false.choose('Active', 'Inactive'); // 'Inactive'
true.toInt(); // 1
false.toInt(); // 0
true.toYesNo(); // 'Yes'
false.toYesNo(trueString: 'On', falseString: 'Off'); // 'Off'
true.not; // false

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🗓️ DateTime Extensions

✅ Checkers

• isAfternoon – Checks if the time is between 12:00 PM and 5:59 PM.

• isMorning – Checks if the time is before 12:00 PM.

• isEvening – Checks if the time is between 6:00 PM and 11:59 PM.

• isNight – Checks if the time is between midnight and 5:59 AM.

• isToday / isTomorrow / isYesterday – Quickly check the relation to the current day.

• isSameDay(DateTime other) – Returns true if the date is the same calendar day as other.

• isInPast / isInFuture – Check if the datetime is before or after now.

🔧 Utilities

• startOfDay() – Returns the start of the day (midnight) for the datetime.

🔧 Manipulators

• addDays(int) / addMonths(int) / addYears(int) – Add to the datetime.

• addHours(int) / addMinutes(int) / addSeconds(int) – Add smaller units.

• subDays(int) / subMonths(int) / subYears(int) – Subtract from the datetime.

• subHours(int) / subMinutes(int) / subSeconds(int) – Subtract smaller units.

🔢 Age

• toAge() – Convert the date to an age in years.

• isAgeOlder(age) / isAgeYounger(age) / isAgeEqualTo(age) – Check against an age.

• isAgeBetween(min, max) – Check if the age is within a given range.

🧠 Time to String

• format(String format) – Fully custom format using intl.

  Popular date and time formats included in the [MayrDateTimeFormats] class.

  Currently includes:

  • MayrDateTimeFormats.ukDate - dd/MM/yyyy
  • MayrDateTimeFormats.ukDateTime - dd/MM/yyyy HH:mm:ss
  • MayrDateTimeFormats.usDate - yyyy-MM-dd
  • MayrDateTimeFormats.usDateTime - yyyy-MM-dd HH:mm:ss
  • MayrDateTimeFormats.time - HH:mm:ss
  • MayrDateTimeFormats.timeNoSecs - HH:mm

• toDayOrdinal() – Get the day of the month with ordinal (e.g. 1st, 22nd, 31st).

• toTimeAgoString() – Human-readable "time ago" format (e.g. "2 days ago").

• toTimeString() – Convert to time only (e.g. 14:35 or 14:35:59).

• toShortDate() – Returns a short formatted date string (e.g. Wed 15th Jan).

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⏳ Duration Extensions

• delay([callback]) – Delays execution for the given duration. Optionally accepts a callback to run after the delay.
• toReadableString() – Returns a human-readable string representation (e.g., '2h 30m', '1d 5h 30m').
• isLongerThan(other) – Checks if this duration is longer than another duration.
• isShorterThan(other) – Checks if this duration is shorter than another duration.

// Example
await 2.seconds.delay(() {
  print('Delayed by 2 seconds');
});

final duration = Duration(hours: 2, minutes: 30);
print(duration.toReadableString()); // '2h 30m'

5.seconds.isLongerThan(3.seconds); // true
3.seconds.isShorterThan(5.seconds); // true

---

🔷 Object Extensions

• let(transform) – Executes a function with this object as its argument and returns the result. Useful for chaining operations or transforming values inline.
• also(action) – Executes a function with this object and returns this object. Useful for performing side effects while maintaining the original value for further chaining.

// Examples
final result = 'hello'.let((it) => it.toUpperCase()); // 'HELLO'
final length = 'test'.let((it) => it.length); // 4

final user = User('John')
  .also((it) => print('Created user: ${it.name}'))
  .also((it) => log.info('User created'));

---

🌀 Dynamic Extensions

• nullOnDebug<T>() – Returns null only in debug mode; retains value in release/profile. Useful for testing nullable flows.

• onlyOnDebug<T>() – Returns the value only in debug mode, otherwise null.

• maybe<T>({double probability = 0.5}) – Randomly returns null based on the given probability (between 0.0 and 1.0). Great for simulating unreliable data in tests or dev mode.

  final value = 'Simulate me'.maybe(probability: 0.3);
  // Has a 30% chance of being null

• orDefault(T fallback) - Returns the fallback value if the provided value is null

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🖼️ Image Extensions

• circleAvatar({ ... }) – Quickly convert an ImageProvider to a CircleAvatar widget with full customisation options.

// Example
NetworkImage('https://example.com/pic.jpg').circleAvatar(radius: 40);

Parameters:

• backgroundColor – Background colour of the avatar (default is transparent).
• radius – Sets the circular radius of the avatar.
• minRadius / maxRadius – Optional constraints.
• foregroundColor – Colour for the foreground image.
• onBackgroundImageError / onForegroundImageError – Handle image load failures.

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🔢 Number Extensions

🧮 General Num Extensions

• isEqual(otherNum) – Checks if two numbers are exactly equal.

• isGreaterThan(otherNum) – Returns true if the number is greater.

• isLessThan(otherNum) – Returns true if the number is less.

• clampMin(min) – Clamps the number to a minimum value.

• clampMax(max) – Clamps the number to a maximum value.

• isBetween(min, max) – Checks if the number is within a range (inclusive).

• isPositive – Returns true if the number is greater than zero.

• isNegativeNumber – Returns true if the number is less than zero.

• isZero – Returns true if the number equals zero.

🔢 Integer Extensions

• isEvenNumber – Checks if the integer is even.
• isOddNumber – Checks if the integer is odd.
• times(action) – Repeats an action n times.
• timesIndexed(action) – Repeats an action n times with the current index.

// Example
5.isBetween(1, 10); // true
3.times(() => print('Hello')); // Prints 'Hello' 3 times
3.timesIndexed((i) => print('Index: $i')); // Prints indices 0, 1, 2

🎲 Random Generators

• randomLess({min = 1.0}) – For int or double, generates a random value less than the current one, starting from the min.

• randomMore(max) – Generates a random value greater than the current one, up to max.

10.randomLess(); // e.g. returns 3, 7, etc.
5.5.randomMore(10.0); // e.g. returns 6.23, etc.

🎯 Double Extensions

• toDecimalPlaces(places) – Rounds the double to a specified number of decimal places.

3.14159.toDecimalPlaces(2); // 3.14
3.14159.toDecimalPlaces(4); // 3.1416

💰 Number Formatting

• formatAsCurrency({locale, symbol, decimalDigits}) – Formats the number as currency.

• formatAsDecimal({locale, decimalDigits}) – Formats the number as a decimal with specified precision.

• formatAsNumber({locale}) – Formats as a regular number string.

1234.5.formatAsCurrency(locale: 'en_NG', symbol: '₦'); // ₦1,234.50

⏱️ Number to Duration

• days, hours, minutes, seconds, milliseconds, microseconds – Shorthand for converting numbers to Duration.

// Example
await 2.seconds.delay(); // Waits for 2 seconds

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🔤 String Extensions

✅ Utilities

• copyToClipboard() - Copies the string to clipboard.

• matchesRegExp(regex) – Checks if the string matches a given regular expression.

• toBool – Converts "true" or "false" to a boolean.

• toDateTime() – Parses the string into a DateTime object. Returns null if parse fails

• toRegExp() – Converts the string into a RegExp.

• toUri() - Attempts to parse the string to a Uri

• limit(maxLength, [overflow = "…"]) – Limits string length with optional overflow characters.

• mask({start = 2, end = 2, maskChar = '*', maskLength}) – Masks the middle of the string, leaving edges visible.

  '08012345678'.mask(); // 08*******78
  '08012345678'.mask(maskLength: 2); // 08**78

• reverse() – Reverses the string.

• isBlank / isNotBlank – Checks if the string is empty or contains only whitespace.

• removeWhitespace() – Removes all whitespace from the string.

• countOccurrences(substring) – Counts how many times a substring appears.

• truncate(maxLength, {ellipsis}) – Truncates the string with word boundary awareness.

• wrap(prefix, [suffix]) – Wraps the string with a prefix and optional suffix.

• removePrefix(prefix) – Removes a prefix if it exists.

• removeSuffix(suffix) – Removes a suffix if it exists.

// Examples
'hello'.reverse(); // 'olleh'
'  '.isBlank; // true
'hello world'.removeWhitespace(); // 'helloworld'
'hello world'.countOccurrences('l'); // 3
'The quick brown fox'.truncate(10); // 'The quick...'
'text'.wrap('"'); // '"text"'
'Hello World'.removePrefix('Hello '); // 'World'

🎀 Pretty Printing

• prettyJson() – Formats a raw JSON string.

• prettyXml() – Formats raw XML into readable indents.

• prettyYaml() – Formats YAML strings prettily.

🔠 Casing

• camelCase – Converts string to camelCase.

• capitalised – Capitalises the first letter of each word.

• kebabCase – Converts string to kebab-case.

• pascalCase – Converts string to PascalCase.

• snakeCase – Converts string to snake_case.

• titleCase – Converts string to Title Case.

'the big brown fox'.camelCase; // theBigBrownFox
'the big brown fox'.capitalised; // The big brown fox
'the big brown fox'.pascalCase; // TheBigBrownFox
'the big brown fox'.kebabCase; // the-big-brown-fox
'the big brown fox'.snakeCase; // the_-_big_-_brown_-_fox
'the big brown fox'.titleCase; // The Big Brown Fox

🧪 Case and Pattern Checkers

Case Checkers

• isCamelCase

• isPascalCase

• isSnakeCase

• isKebabCase

• isTitleCase

• isCapitalised

• isUpperCase

• isLowerCase

Pattern Checkers

• isEmail

• isURL

• isUlid

• isUuid

• isSlug

• isHexColor

• isIPAddress

• isNum – Validates numeric string

• isAlphabetOnly

• isNumericOnly

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🧩 Iterable / List Extensions

Query & Search

• firstOrNull() → Returns first element or null if empty
• lastOrNull() → Returns last element or null if empty
• singleWhereOrNull(predicate) → Returns match or null
• containsWhere(predicate) → Boolean check
• indexWhereOrNull(predicate) → Returns index or null

// Examples
[1, 2, 3].firstOrNull(); // 1
[].firstOrNull(); // null
[1, 2, 3].singleWhereOrNull((e) => e == 2); // 2
[1, 2, 3].containsWhere((e) => e > 2); // true

Safe Access

• getOrNull(index) → Returns element at index or null
• getOrDefault(index, defaultValue) → Returns element or default value

// Examples
[1, 2, 3].getOrNull(1); // 2
[1, 2, 3].getOrNull(5); // null
[1, 2, 3].getOrDefault(5, 0); // 0

Transformations

• chunked(size) → Splits into chunks
• mapIndexed((index, item) => ...) → Maps with index
• whereNotNull() → Filters out nulls
• distinctBy(keySelector) → Unique items by property
• flatten() → Flattens nested lists
• sortedBy(keySelector) / sortedByDesc(keySelector) → Sort by property
• flip() → Reverses the list

// Examples
[1, 2, 3, 4, 5].chunked(2); // [[1, 2], [3, 4], [5]]
['a', 'b', 'c'].mapIndexed((i, e) => '$i: $e'); // ['0: a', '1: b', '2: c']
[1, null, 2, null, 3].whereNotNull(); // [1, 2, 3]
[[1, 2], [3, 4]].flatten(); // [1, 2, 3, 4]
[1, 2, 3].flip(); // [3, 2, 1]

Aggregations (Only available on list of numbers)

• sumBy(num Function(T)) → Sum elements by selector
• averageBy(num Function(T)) → Average by selector
• min() → Minimum value
• max() → Maximum value
• countWhere(predicate) → Count matching elements

// Examples
[1, 2, 3, 4, 5].sumBy((e) => e); // 15
[1, 2, 3, 4, 5].averageBy((e) => e); // 3.0
[3, 1, 4, 1, 5].min(); // 1
[3, 1, 4, 1, 5].max(); // 5
[1, 2, 3, 4, 5].countWhere((e) => e > 3); // 2

Mutation Helpers (returns new copy)

• insertIf(condition, value) → Insert conditionally
• replaceWhere(predicate, newValue) → Replace matching elements
• removeWhereNot(predicate) → Keep only matching elements
• updateWhere(predicate, updater) → Update matching elements
• addIf(value) / addAllIf(values) → Add conditionally
• append(value) / appendAll(values) → Append elements
• appendIf(value) / appendAllIf(values) → Append conditionally
• pop() → Remove and return last element
• fliter(predicate) → Filter elements
• unique() → Get unique elements

// Examples
[1, 2, 3].insertIf(true, 4); // [1, 2, 3, 4]
[1, 2, 3, 2].replaceWhere((e) => e == 2, 5); // [1, 5, 3, 5]
[1, 2, 3, 4, 5].removeWhereNot((e) => e > 2); // [3, 4, 5]
[1, 2, 2, 3, 3, 4].unique(); // [1, 2, 3, 4]

Utility

• isNullOrEmpty() → Check if empty
• joinToString(separator, transform) → Join with custom format
• forEachIndexed() → Iterate with index

// Examples
[].isNullOrEmpty(); // true
[1, 2, 3].joinToString(separator: ', '); // '1, 2, 3'
['a', 'b'].forEachIndexed((i, e) => print('$i: $e'));

---

🗺️ Map Extensions

Safe Access

• getOrNull(key) → Get value or null
• getOrDefault(key, defaultValue) → Get value or default

// Examples
{'a': 1, 'b': 2}.getOrNull('a'); // 1
{'a': 1, 'b': 2}.getOrNull('c'); // null
{'a': 1, 'b': 2}.getOrDefault('c', 0); // 0

Transformations

• mapKeys((k, v) => newKey) → Transform keys
• mapValues((k, v) => newValue) → Transform values
• filterKeys(predicate) → Filter by keys
• filterValues(predicate) → Filter by values
• invert() → Swap keys and values

// Examples
{'a': 1, 'b': 2}.mapKeys((k, v) => k.toUpperCase()); // {'A': 1, 'B': 2}
{'a': 1, 'b': 2}.mapValues((k, v) => v * 2); // {'a': 2, 'b': 4}
{'a': 1, 'b': 2}.invert(); // {1: 'a', 2: 'b'}

Merge & Combine

• merge(otherMap) → Merge with precedence
• mergeIfAbsent(otherMap) → Merge without overriding
• combine(other, (k, v1, v2) => mergedValue) → Custom merge

// Examples
{'a': 1, 'b': 2}.merge({'b': 3, 'c': 4}); // {'a': 1, 'b': 3, 'c': 4}
{'a': 1, 'b': 2}.mergeIfAbsent({'b': 3, 'c': 4}); // {'a': 1, 'b': 2, 'c': 4}

Utility

• keysWhere(predicate) → Get keys matching predicate
• valuesWhere(predicate) → Get values matching predicate
• toQueryString() → Convert to URL query string

// Examples
{'a': 1, 'b': 2, 'c': 3}.keysWhere((v) => v > 1); // ['b', 'c']
{'name': 'John', 'age': '30'}.toQueryString(); // 'name=John&age=30'

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🔢 Set Extensions

• toggle(element) → Adds if missing, removes if present
• intersects(otherSet) → Check for intersection
• isSubsetOf(otherSet) → Check if subset
• isSupersetOf(otherSet) → Check if superset
• unionAll(sets) → Union of multiple sets
• without(element) → Remove element

// Examples
{1, 2, 3}.toggle(2); // {1, 3}
{1, 2, 3}.toggle(4); // {1, 2, 3, 4}
{1, 2, 3}.intersects({2, 3, 4}); // true
{1, 2}.isSubsetOf({1, 2, 3}); // true
{1, 2}.unionAll([{2, 3}, {3, 4}]); // {1, 2, 3, 4}

---

🎯 Humanize Extensions

The goal of humanize is simple:

Convert technical or numeric values into readable, natural, human-friendly strings.

Where computers speak in seconds, bytes, and counts, humanize translates them into something that sounds like it came from a person.

Durations

• .humanize(locale) → "2 hours, 3 minutes"

// Examples
Duration(hours: 2, minutes: 3).humanize(); // '2 hours, 3 minutes'
Duration(days: 1).humanize(); // '1 day'
Duration(seconds: 45).humanize(); // '45 seconds'

Time (DateTime)

• .humanize(locale) → "just now", "3 hours ago", "yesterday", "last week", "3 days from now", "2 weeks ago"

// Examples
DateTime.now().humanize(); // 'just now'
DateTime.now().subtract(Duration(hours: 3)).humanize(); // '3 hours ago'
DateTime.now().subtract(Duration(days: 1)).humanize(); // 'yesterday'
DateTime.now().add(Duration(days: 2)).humanize(); // 'in 2 days'

Numbers

• humanizeNumber() → "15.3k", "1.5M"
• humanizeOrdinal() → "1st", "2nd", "3rd"
• humanizeCount('item') → "1 item" / "3 items"
• humanizePercentage(max, min) → "74%"
• humanizeFileSize() → "1.0 MB", "520.3 KB"

// Examples
1234.humanizeNumber(); // '1.2k'
1500000.humanizeNumber(); // '1.5M'
1.humanizeOrdinal(); // '1st'
21.humanizeOrdinal(); // '21st'
3.humanizeCount('item'); // '3 items'
0.75.humanizePercentage(); // '75%'
1024.humanizeFileSize(); // '1.0 KB'
520300.humanizeFileSize(); // '508.1 KB'

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🧩 Widget Extensions

🪄 Basic Transformations

• center({heightFactor, widthFactor}) – Wraps widget in a Center.

• expanded([flex = 1]) – Wraps widget in an Expanded.

• flexible({flex = 1, fit = FlexFit.loose}) – Wraps widget in a Flexible.

• opacity(opacity) – Wraps widget with an Opacity widget.

• sizedBox({width, height}) – Wraps widget with a SizedBox.

• constrained({maxHeight, maxWidth, minHeight, minWidth}) – Wraps widget with a ConstrainedBox.

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✂️ Clipping

• clipRect() – Clips widget to a rectangle.

• clipRRect(borderRadius) – Clips widget with rounded corners.

• clipRounded([radius = 12]) – Quickly clip widget with a uniform rounded border.

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🧹 Padding

• paddingAll(padding) – Adds equal padding on all sides.

• paddingSymmetric({horizontal, vertical}) – Adds symmetric horizontal and vertical padding.

• paddingOnly({left, top, right, bottom}) – Custom padding for specific sides.

• paddingZero() – Adds zero padding.

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🧭 Positioning

• positionAlign(alignment) – Aligns widget using Align.

• positionedFill() – Fills parent constraints using Positioned.fill.

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👻 Visibility Helpers

• hideIf(condition) – Hides widget (returns SizedBox.shrink()) if condition is true.

• hideUnless(condition) – Hides widget unless condition is true.

• showIf(condition) – Shows widget if condition is true, otherwise hides.

• showUnless(condition) – Shows widget unless condition is true.

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🔘 inkwellManager on Widget

A helper class for managing taps on a widget in a cleaner way.

• inkWellManager(callback, {color = Colors.transparent}) – Wraps widget with an InkWell for tap detection.

• onTap() – Wraps child with InkWell for tap gesture.

• onDoubleTap() – Wraps child with InkWell for double-tap gesture.

• onLongPress() – Wraps child with InkWell for long-press gesture.

Tip: Used alongside the inkWellManager extension to easily attach tap interactions without boilerplate.

Text('Click Me')
  .inkWellManager(() => print('Tapped'), color: Colors.black)
  .onTap();

💡 Why InkWellManager?

Normally, to make a widget respond to taps, you must manually wrap it inside an InkWell every time, setting colours and callbacks. InkWellManager simplifies this by providing quick .onTap(), .onDoubleTap(), and .onLongPress() methods — making your code shorter, cleaner, and more maintainable.

It also auto-applies the same splash, hover, and focus colours without extra setup.

📜 DateTimeFormat

This package also include some common date time formats. These inlude:

• MayrDateTimeFormats.ukDate
• MayrDateTimeFormats.usDate
• MayrDateTimeFormats.time
• MayrDateTimeFormats.timeNoSecs
• MayrDateTimeFormats.ukDateTime
• MayrDateTimeFormats.usDateTime

Usage

To use, simply import the package into your project and you can then all of the extensions it provdes 🫶🏾

import 'package:mayr_extensions/mayr_extensions.dart';

📢 Additional Information

🤝 Contributing

Contributions are highly welcome! If you have ideas for new extensions, improvements, or fixes, feel free to fork the repository and submit a pull request.

Please make sure to:

• Follow the existing coding style.
• Write tests for new features.
• Update documentation if necessary.

Let's build something amazing together!

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🐛 Reporting Issues

If you encounter a bug, unexpected behaviour, or have feature requests:

• Open an issue on the repository.
• Provide a clear description and steps to reproduce (if it's a bug).
• Suggest improvements if you have any ideas.

Your feedback helps make the package better for everyone!

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📜 Licence

This package is licensed under the MIT License — which means you are free to use it for commercial and non-commercial projects, with proper attribution.

See the LICENSE file for more details.

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🌟 Support

If you find this package helpful, please consider giving it a ⭐️ on GitHub — it motivates and helps the project grow!

You can also support by:

• Sharing the package with your friends, colleagues, and tech communities.
• Using it in your projects and giving feedback.
• Contributing new ideas, features, or improvements.

Every little bit of support counts! 🚀💙