What New (2.2.4)

Sliver extensions

Why Method Extensions? When you’re using someone else’s API or when you implement a library that’s widely used, it’s often impractical or impossible to change the API. But you might still want to add some functionality.

let me know if you want something specific or you found a bug at bar.idan@gmail.com

Let get started 💪🏻

Go to pubspec.yaml
add a dart_extensions and replace [version] with the latest version:

dependencies:  
 dart_extensions: ^[version]

click the packages get button or flutter pub get

Responsive UI

Very common way to calculate size in percentage is using the MediaQuery like so:

MediaQuery.of(context).size.width * 0.1

Flatten a nested Map into a single level map

response.flatJson({
  'key1': {'keyA': 'valueI'},
  'key2': {'keyB': 'valueII'},
  'key3': {
    'a': {
      'b': {'c': 2}
    }
  }
});

The result you can also specify max depth, its the maximum number of nested objects to flatten.

// { // 'key1.keyA': 'valueI', // 'key2.keyB': 'valueII', // 'key3.a.b.c': 2 // };

Instead of the boilerplate we can use this awesome extension and get the same results.

Wrap your Application with:

ResponsiveApp(
      builder: (BuildContext context, Orientation orientation, DeviceType deviceType) {
        return YourAppWidget()
)

AnimatedList(
              key: chatListKey,
              reverse: true,
              padding: EdgeInsets.only(top: 10.textSizeResponsive),
              shrinkWrap: true,

Also the text should be responsive, no problem

Text(
  'Note added by ${message.from ?? ''}',
  style: avanirBook.copyWith(fontSize: 8.responsiveText),
),

Iterable Extensions

.any()

Returns true if at least one element matches the given predicate.

final users = [User(22, "Kasey"), User(23, "Jadn")]; 
users.any((u) => u.name == 'Kasey') // true

.groupBy()

Groups the elements in values by the value returned by key.

final users = [User(22, "Kasey"), User(23, "Jadn"), User(22, "Rene"), User(32, "Aden")]; 

users.groupBy((u) => u.age);

Sort the users by age:

{  
  22: [User:22, Kasey, User:22, Rene], 
  23: [User:23, Jadn], 
  32: [User:32, Aden]
}

.sortBy()

Sorts elements in the array in-place according to natural sort order of the value returned by specified selector function.

final users = [User(22, "Kasey"), User(16, "Roni"), User(23, "Jadn")]; 
users.sortBy((u) => u.age) ///  [User(16, "Roni"), [User(22, "Kasey"), User(23, "Jadn")]

.find()

Returns the first element matching the given predicate, or null if element wasn't found.

final users = [User(22, "Kasey"), User(23, "Jadn"), User(22, "Rene"), User(32, "Aden")]; 

users.find((u) => u.name == "Rene") // User(22, "Rene")

.chunks()

Splits the Iterable into chunks of the specified size

[1, 2, 3, 4, 5, 6, 7, 8, 9, 10].chunks(3))

result

([1, 2, 3], [4, 5, 6], [7, 8, 9], [10])

.filter()

Returns a list containing only elements matching the given predicate, the return type will be List, unlike the where operator that return Iterator, also it filters null.

final users = [User(22, "Kasey"), User(23, "Jadn"), User(22, "Rene"), User(32, "Aden")]; 
final filtered = users.filter((u) => u.name == "Kasey"); // [User(22, "Kasey")] <- Type List<User>

final listWithNull = [null, User(23, "Jadn"), User(22, "Rene"), User(32, "Aden")];
final filtered = listWithNull.filter((u) => u.name == "Jadn"); // [User(23, "Jadn")]

.intersect()

Returns a set containing all elements that are contained by both this set and the specified collection.

Set.from([1, 2, 3, 4]).intersect(Set.from([3, 4, 5, 6]) // 1,2,3,4,5,6

.filterNot()

Returns a list containing only not the elements matching the given predicate, the return type will be List, unlike the where operator that return Iterator, also it filters null.

final users = [User(22, "Kasey"), User(23, "Jadn"), User(22, "Rene"), User(32, "Aden")]; 
final filtered = users.filterNot((u) => u.name == "Kasey"); // [User(23, "Jadn"), User(22, "Rene"), User(32, "Aden")] <- Type List<User>

final listWithNull = [null, User(23, "Jadn"), User(22, "Rene"), User(32, "Aden")];
final filtered = listWithNull.filterNot((u) => u.name == "Jadn"); // [User(22, "Rene"), User(32, "Aden")]

.takeOnly()

Returns a list containing first [n] elements.

[1, 2, 3, 4].takeOnly(1) // [1]

.drop()

Returns a list containing all elements except first [n] elements.

[1, 2, 3, 4].drop(1) // [2, 3, 4]

.forEachIndexed()

Performs the given action on each element on iterable, providing sequential index with the element.

["red","green","blue"].forEachIndexed((item, index) { 
	print("$item, $index"); 
}); // 0: red // 1: green // 2: blue```

.sortedDescending()

Returns a new list with all elements sorted according to descending natural sort order.

var list = [1,2,3,4,5];  
final descendingList = list.sortedDescending();  
print(descendingList); // [5, 4, 3, 2, 1]

.count()

Return a number of the existing elements by a specific predicate

final users = [User(33, "Miki"), User(45, "Anna"), User(19, "Amit")];  
  
final aboveAgeTwenty = users.count((user) => user.age > 20);  
print(aboveAgeTwenty); // 2

.associate()

Creates a Map instance in which the keys and values are computed from the iterable.

final users = [User(33, "Miki"), User(45, "Anna"), User(19, "Amit")];  

users.associate((k) => k.name, (e) => e.age) // 'Miki': 33, 'Anna': 45, 'Amit': 19}

.concatWithMultipleList()

Return a list concatenates the output of the current list and multiple iterables.

  final listOfLists = [
        [5, 6, 7],
        [8, 9, 10]
      ];
  [1, 2, 3, 4].concatWithMultipleList(listOfLists); 
  
  // [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

.distinctBy()

Returns a list containing only the elements from given collection having distinct keys.

// example 1
final users = ["Zack", "Ian", "Ronit"];  
users.distinctBy((u) => u.toLowerCase().startsWith("z")); // Zack 

// example 2
final users = [User(11, 'idan'), User(12, 'ronit'), User(11, 'asaf')];
	
final dist = users.distinctBy((u) => u.age);    
dist.forEach((u) => print(u.age)); //  11, 12

.zip()

Zip is used to combine multiple iterables into a single list that contains the combination of them two.

final soldThisMonth = [Motorcycle(2020, 'BMW R1200GS'), Motorcycle(1967, 'Honda GoldWing')];
final soldLastMonth = [Motorcycle(2014, 'Honda Transalp'), Motorcycle(2019, 'Ducati Multistrada')];    
  
final sales = soldThisMonth.zip(soldLastMonth).toList();  
  				
print(sales); // [
  [brand: BMW R1200GS year: 2020, brand: Honda Transalp year: 2014], // first pair from this month and last
  [brand: Honda GoldWing year: 1967, brand: Ducati Multistrada year: 2019] // second pair from last month 
]

See iterable.dart for more examples.

Flutter Extensions

Context extensions

Are you not tired from typing MediaQuery.of(context).size... to get height or width? here's a cool extension

  context.mq  // returns the MediaQuery

  context isLandscape // returns if Orientation is landscape

context.sizePx // returns same as MediaQuery.of(context).size

context.widthPx // returns same as MediaQuery.of(context).size.width

context.heightPx // returns same as MediaQuery.of(context).height

Text Extensions

final text = Text('hello')
     .bold()
     .fontSize(25)
     .italic();

List Extensions

    final someWidgetList = [
      Text('hello'),
      Text('world'),
    ].toColumnWidget();  // toRowWidget(), toStackWidget()

Widget extensions

So now we can just add round corners, shadows, align, and added gestures to our Widgets without the crazy water-fall effect. awesome! That's just the tip of the iceberg, expect to see very cool stuff soon.

class Home extends StatefulWidget {
  @override
  _HomeState createState() => _HomeState();
}

class _HomeState extends State<Home> {

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Container(
        child: Stack(
          children: <Widget>[
            Container(
              height: 100,
              width: 100,
            )   .withRoundCorners(backgroundColor: Colors.grey)
                .withShadow()
                .alignAtCenter()
                .toCenter()
                .withTooltip('just a tooltip')
                .paddingOnly(left: 10)
                .paddingAll(20)
                .onTap(() => print('tap'))
                .onLongPress(() => print('long press'))
          ],
        ),
      ),
    );
  }
}

Navigation

We can navigate from every widget by calling these methods

    navigateTo(route: MaterialPageRoute(builder: (c) => Login()));
    navigateByRouteName(Routes.home, );
    final result = navigateBack();

Http Extensions

.httpGet()

Sends an HTTP GET request with the given headers to the given URL

final json = await "https://jsonplaceholder.typicode.com/posts".httpGet();

result:

[
  {
    "userId": 1,
    "id": 1,
    "title": "sunt aut facere",
    "body": "quia et suscipit"
  },
  {
    "userId": 1,
    "id": 2,
    "title": "qui est esse",
    "body": "dolor beatae ea dolores neque"
  },
]

usage with then:

"https://jsonplaceholder.typicode.com/posts".httpGet().then((result) {
          print(result);
       }).catchError((e) => print(e));

.httpPost()

Sends an HTTP POST request with the given headers and body to the given URL which can be a [Uri] or a [String].

String json = '{"title": "Hello", "body": "body text", "userId": 1}';
final json = await "https://jsonplaceholder.typicode.com/posts".httpPost(json);

for more examples (put, delete) See http.dart

Range Extensions

.until()

Returns a sequence of integer, starting from the current number until the [end] number. [step] is optional, it will step number if given

for(final num in 1.until(10)) {
  numbers.add(num); 
}

result

[1, 2, 3, 4, 5, 6, 7, 8, 9]

with step:

for(final num in 1.until(10, step: 2)) {
  numbers.add(num); 
}

result

[1, 3, 5, 7, 9]

String Extensions

.asBool()

Returns true if this string is any of these values: "true", "yes", "1", or if the string is a number and greater than 0, false if less than 1. This is also case insensitive.

'true'.asBool  // true
'True'.asBool  // true
'false'.asBool //  false
'False'.asBool //  false
'yes'.asBool   // true
'YES'.asBool   // true
'no'.asBool    // false
'NO'.asBool    // false

.insert()

Returns a new string in which a specified string is inserted at a specified index position in this instance.

'test'.insert(1, 't') // 'ttest'
'123456890'.insert(6, '7') // '1234567890'
'dart cool'.insert(4, ' is') // 'dart is cool'

.isNullOrWhiteSpace()

Indicates whether a specified string is null, empty, or consists only of white-space characters.

'test'.isNullOrWhiteSpace // false
'   '.isNullOrWhiteSpace, // true
null.isNullOrWhiteSpace, // true
'  te  st  '.isNullOrWhiteSpace // false

.replaceAfter()

Replace part of string after the first occurrence of given delimiter.

print("myemail@".replaceAfter("@", "gmail.com")); // myemail@gmail.com

.replaceBefore()

Replace part of string before the first occurrence of given delimiter.

print('@domain.com'.replaceBefore('@', "name")); // "name@domain.com"

.anyChar()

Returns true if at least one element matches the given predicate

'test'.anyChar((c) => c == 't'); // true;
'test'.anyChar((c) => c == 'd'); // false;

.ifEmpty()

If the string is empty perform an action.

"".ifEmpty(() => print("do any action here")); // do any action here

.toDoubleOrNull()

Parses the string as an integer or returns null if it is not a number.

var number = '12345'.toDoubleOrNull(); // 12345  
var notANumber = '123-45'.toDoubleOrNull(); // null

.limitFromEnd()

Limit the string to a maximum length, taking from the end of the string.

var longString = "0123456789";
var noMoreThanThree = longString.limitFromEnd(3); // "789"

.limitFromStart()

Limit the string to a maximum length, taking from the start of the string.

var longString = "0123456789";
var noMoreThanThree = longString.limitFromStart(3); // "012"

int Extensions

.inRangeOf()

Return the min if this number is smaller then minimum Return the max if this number is bigger the the maximum Return this number if it's between the range

1.inRangeOf(0, 3) // 1 number in range so will return the number
2.inRangeOf(3, 4) // 3 number is smaller then the range so will return min
5.inRangeOf(3, 4) // 4 number is bigger then the range so will return max

Flutter Extensions Full List

Flutter

Tooltip
algin
center
container
padding
navigation
Context
Text
List<Widget>
Icon

Http Extensions

httpGet
httpPost
httpPut
httpDelete

Iterables Extensions

sortBy
toMutableSet
intersect
groupBy
find
filter
filterNot
isEmptyOrNull
chunks
zip
half
takeOnly
drop
firstHalf
secondHalf
swap
getRandom
firstOrNull
firstOrNullWhere
firstOrDefault
lastOrNull
lastOrDefault
forEachIndexed
sortedDescending
containsAll
count
distinctBy
subtract
concatWithSingleList
concatWithMultipleList
associate

Range Extensions

until

Strings Extensions

validateEmail
removeSurrounding
isNullOrEmpty
replaceAfter
replaceBefore
orEmpty
ifEmpty
lastIndex
printThis
equalsIgnoreCase
toDoubleOrNull
toIntOrNull
anyChar
removeAllWhiteSpace
isNotBlank
toCharArray
insert
isNullOrWhiteSpace
asBool

DateTime Extensions

toMilliseconds
toSeconds
toMinutes
toHours
toDays
isToday
addOrRemoveYears
addOrRemoveMonth
addOrRemoveDay
addOrRemoveMinutes
addOrRemoveSeconds
startOfDay
startOfMonth
startOfYear
operator to add dates
operator to subtract dates
tomorrow
yesterday
min
max
isLeapYear
limitFromEnd
limitFromStart

Integers Extensions

inRangeOf
absolute
isEven
isOdd
isPositive
isNegative
tenth
fourth
third
half
doubled
tripled
quadrupled
squared
asBool

Contributing

If you have read up till here, then 🎉🎉🎉. There are couple of ways in which you can contribute to the growing community of dart_extensions.dart.

Propose any feature, enhancement
Report a bug
Fix a bug
Participate in a discussion and help in decision making
Write and improve some documentation. Documentation is super critical and its importance cannot be overstated!
Send in a Pull Request :-)

Contributors ✨

_{Idan Ayalon}
💻 📖 👀

_Xamantra
💻 📖 👀

License

Copyright 2020 Idan Ayalon
  
Licensed under the Apache License, Version 2.0 (the "License");  
you may not use this file except in compliance with the License.  
You may obtain a copy of the License at  
  
 http://www.apache.org/licenses/LICENSE-2.0  
Unless required by applicable law or agreed to in writing, software  
distributed under the License is distributed on an "AS IS" BASIS,  
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  
See the License for the specific language governing permissions and  
limitations under the License.

droididan/dart_extensions

What New (2.2.4)

Let get started 💪🏻

Responsive UI

Iterable Extensions

.any()

.groupBy()

.sortBy()

.find()

.chunks()

.filter()

.intersect()

.filterNot()

.takeOnly()

.drop()

.forEachIndexed()

.sortedDescending()

.count()

.associate()

.concatWithMultipleList()

.distinctBy()

.zip()

Flutter Extensions

Context extensions

Text Extensions

List Extensions

Widget extensions

Navigation

Http Extensions

.httpGet()

.httpPost()

Range Extensions

.until()

String Extensions

.asBool()

.insert()

.isNullOrWhiteSpace()

.replaceAfter()

.replaceBefore()

.anyChar()

.ifEmpty()

.toDoubleOrNull()

.limitFromEnd()

.limitFromStart()

int Extensions

.inRangeOf()

Flutter Extensions Full List

Flutter

Http Extensions

Iterables Extensions

Range Extensions

Strings Extensions

DateTime Extensions

Integers Extensions

Contributing

Contributors ✨

License