Archie Mistry

Archie Mistry

1604398620

Immutable lists and other collections, which are as fast as their native Flutter

Fast Immutable Collections

THIS IS UNDER ACTIVE DEVELOPMENT. DON’T USE IT.

THIS IS UNDER ACTIVE DEVELOPMENT. DON’T USE IT.

THIS IS UNDER ACTIVE DEVELOPMENT. DON’T USE IT.

Introduction

This package provides:

  • IList is an immutable list
  • ISet is an immutable set
  • IMap is an immutable map
  • IMapOfSets is an immutable map of sets

Fast Immutable Collections is a competitor to the excellent built_collection and kt_dart packages, but it’s much easier to use than the former, and orders of magnitude faster than the latter.

The reason it’s easier than built_collection is that there is no need for mutable/immutable cycles. You just create your immutable collections and use them directly.

The reason it’s faster than kt_dart is that it creates immutable collections by internally saving only the difference between each collection, instead of copying the whole collection each time. This is transparent to the developer, which doesn’t need to know about these implementation details. Later in this document, we provide benchmarks so that you can compare speeds (and you can also run the benchmarks yourself).

IList

An IList is an immutable list, meaning once it’s created it cannot be modified. You can create an IList by passing an iterable to its constructor, or you can simply “lock” a regular list. Other iterables (which are not lists) can also be locked as lists:

/// Ways to build an IList

// Using the IList constructor                                                                      
IList<String> ilist = IList([1, 2]);

// Locking a regular list
IList<String> ilist = [1, 2].lock;

// Locking a set as list
IList<String> ilist = {1, 2}.lockAsList;

To create a regular List from an IList, you can use List.of, or simply “unlock” an immutable list:

/// Going back from IList to List

var ilist = [1, 2].lock;

// Using List.of                                  
List<String> list = List.of(ilist);                               

// Is the same as unlocking the IList
List<String> list = ilist.unlock; 

An IList is an Iterable, so you can iterate over it:

var ilist = [1, 2, 3, 4].lock;

// Prints 1 2 3 4
for (int value in ilist) print(value);  

IList methods always return a new IList, instead of modifying the original one. For example:

var ilist1 = [1, 2].lock;

// Results in: 1, 2, 3
var ilist2 = ilist1.add(3);

// Results in: 1, 3
var ilist3 = ilist2.remove(2);             

// Still: 1, 2
print(ilist1); 

Because of that, you can easily chain methods:

// Results in: 1, 3, 4.
var ilist = [1, 2, 3].lock.add(4).remove(2);

Since IList methods always return a new IList, it is an error to call some method and then discard the result:

var ilist = [1, 2].lock;

// Wrong
ilist.add(3);              
print(ilist); // 1, 2

// Also wrong
ilist = ilist..add(3);              
print(ilist); // 1, 2

// Right!
ilist = ilist.add(3);              
print(ilist); // 1, 2, 3                        

IList has all the methods of List, plus some other new and useful ones. However, IList methods always return a new IList, instead of modifying the original list or returning iterables.

For example:

IList<int> ilist = ['Bob', 'Alice', 'Dominic', 'Carl'].lock   
   .sort() // Alice, Bob, Carl, Dominic
   .map((name) => name.length) // 5, 3, 4, 7
   .take(3) // 5, 3, 4   
   .sort(); // 3, 4, 5
   .toggle(4) // 3, 5
   .toggle(2) // 3, 5, 2

IList constructors: IList(), IList.withConfig(), IList.fromISet(), IList.unsafe().

IList methods and getters: empty, withConfig, withIdentityEquals, withDeepEquals, withConfigFrom, isDeepEquals, isIdentityEquals, unlock, unlockView, unlockLazy, unorderedEqualItems, flush, isFlushed, add, addAll, remove, removeAll, removeMany, removeNulls, removeDuplicates, removeNullsAndDuplicates, toggle, [], +, firstOrNull, lastOrNull, singleOrNull, firstOr, lastOr, singleOr, maxLength, sort, sortLike, asMap, clear, indexOf, put, replaceFirst, replaceAll, replaceFirstWhere, replaceAllWhere, process, indexWhere, lastIndexOf, lastIndexWhere, replaceRange, fillRange, getRange, sublist, insert, insertAll, removeAt, removeLast, removeRange, removeWhere, retainWhere, reversed, setAll, setRange, shuffle.

IList Equality

By default, ILists are equal if they have the same items in the same order.

var ilist1 = [1, 2, 3].lock;
var ilist2 = [1, 2, 3].lock;

print(ilist1 == ilist2); // True!

This is in sharp contrast to regular Lists, which are compared by identity:

var list1 = [1, 2, 3];
var list2 = [1, 2, 3];

// Regular Lists compare by identity:
print(list1 == list2); // False!

// While ILists compare by deep equals:
print(list1.lock == list2.lock); // True!

This also means ILists can be used as map keys, which is a very useful property in itself, but can also help when implementing some other interesting data structures. For example, to implement caches:

Map<IList, int> sumResult = {};

String getSum(int a, int b) {
   var keys = [a, b].lock;
   var sum = sumResult[keys];
   if (sum != null) {
     return "Got from cache: $a + $b = $sum";
   } else {
     sum = a + b;
     sumResult[keys] = sum;
     return "Newly calculated: $a + $b = $sum";
   }
}

print(getSum(5, 3)); // Newly calculated: 5 + 3 = 8
print(getSum(8, 9)); // Newly calculated: 8 + 9 = 17                     
print(getSum(5, 3)); // Got from cache: 5 + 3 = 8

However, ILists are configurable, and you can actually create ILists which compare their internals by identity or deep equals, as desired. There are 3 main ways to do achieve:

  1. You can use getters withIdentityEquals and withDeepEquals:

    var ilist = [1, 2].lock;
    
    var ilist1 = [1, 2].lock;              // By default use deep equals.
    var ilist2 = ilist.withIdentityEquals; // Change it to identity equals.
    var ilist3 = ilist2.withDeepEquals;    // Change it back to deep equals.
    
    print(ilist == ilist1); // True!
    print(ilist == ilist2); // False!
    print(ilist == ilist3); // True!
    
  2. You can also use the withConfig method and the ConfigList class to change the configuration:

    var list = [1, 2];
    var ilist1 = list.lock.withConfig(ConfigList(isDeepEquals: true));
    var ilist2 = list.lock.withConfig(ConfigList(isDeepEquals: false));
    
    print(list.lock == ilist1); // True!
    print(list.lock == ilist2); // False!
    
  3. Or you can use the withConfig constructor to explicitly create the IList with your desired configuration:

    var list = [1, 2];
    var ilist1 = IList.withConfig(list, ConfigList(isDeepEquals: true));
    var ilist2 = IList.withConfig(list, ConfigList(isDeepEquals: false));
    
    print(list.lock == ilist1); // True!
    print(list.lock == ilist2); // False!
    

The above described configurations affects how the == operator works, but you can also choose how to compare lists by using the following IList methods:

  • equalItems will return true only if the IList items are equal to the iterable items, and in the same order. This may be slow for very large lists, since it compares each item, one by one. You can compare the list with ordered sets, but unordered sets will throw an error.
  • unorderedEqualItems will return true only if the IList and the iterable items have the same number of elements, and the elements of the IList can be paired with the elements of the iterable, so that each pair is equal. This may be slow for very large lists, since it compares each item, one by one.
  • equalItemsAndConfig will return true only if the list items are equal and in the same order, and the list configurations are equal. This may be slow for very large lists, since it compares each item, one by one.
  • same will return true only if the lists internals are the same instances (comparing by identity). This will be fast even for very large lists, since it doesn’t compare each item. Note: This is not the same as identical(list1, list2) since it doesn’t compare the lists themselves, but their internal state. Comparing the internal state is better, because it will return true more often.

Global IList Configuration

As explained above, the default configuration of the IList is that it compares by deep equality: They are equal if they have the same items in the same order.

You can globally change this default if you want, by using the defaultConfigList setter:

var list = [1, 2];

/// The default is deep-equals.
var ilistA1 = IList(list);
var ilistA2 = IList(list);
print(ilistA1 == ilistA2); // True!

/// Now we change the default to identity-equals. 
/// This will affect lists created from now on.
defaultConfigList = ConfigList(isDeepEquals: false);
var ilistB1 = IList(list);
var ilistB2 = IList(list);
print(ilistB1 == ilistB2); // False!

/// Configuration changes don't affect existing lists.
print(ilistA1 == ilistA2); // True!

Important Note:

The global configuration is meant to be decided during your app’s initialization, and then not changed again. We strongly suggest that you prohibit further changes to the global configuration by calling lockConfig(); after you set your desired configuration.

Usage in tests

An IList is not a List, so this is false:

[1, 2] == [1, 2].lock // False!

However, when you are writing tests, the expect method actually compares all Iterables by comparing their items. Since List and IList are iterables, you can write the following tests:

/// All these tests pass:

expect([1, 2], [1, 2]); // List with List, same order.
expect([1, 2].lock, [1, 2]); // IList with List, same order.
expect([1, 2], [1, 2].lock); // List with IList, same order.
expect([1, 2].lock, [1, 2].lock); // IList with IList, same order.

expect([2, 1], isNot([1, 2])); // List with List, wrong order.
expect([2, 1].lock, isNot([1, 2])); // IList with List, wrong order.
expect([2, 1], isNot([1, 2].lock)); // List with IList, wrong order.
expect([2, 1].lock, isNot([1, 2].lock)); // IList with IList, wrong order.

So, for comparing List with IList and vice-versa this is fine.

However, expect treats Sets differently, resulting that expect(a, b) may be different from expect(b, a). For example:

expect([1, 2], {2, 1}); // This test passes.
expect({2, 1}, [1, 2]); // This test does NOT pass.

If you ask me, this is all very confusing. A good rule of thumb to avoid all these expect complexities is only comparing lists with lists, set with sets, etc.

IList reuse by composition

Classes IListMixin and IterableIListMixin let you easily create your own immutable classes based on the IList. This helps you create more strongly typed collections, and add your own methods to them.

For example, suppose you have some Student class:

class Student {
   final String name;   
   Student(this.name); 
   String toString() => name; 
   bool operator ==(Object other) => identical(this, other) || other is Student && runtimeType == other.runtimeType && name == other.name;  
   int get hashCode => name.hashCode;
}

And suppose you want to create a Students class which is an immutable collection of Students.

You can easily implement it using the IListMixin:

class Students with IListMixin<Student, Students> {

   /// This is the boilerplate to create the collection:
   final IList<Student> _students;
   Students([Iterable<Student> students]) : _students = IList(students);
   Students newInstance(IList<Student> iList) => Students(iList);
   IList<Student> get iList => _students;   

   /// And then you can add your own specific methods:
   String greetings() => "Hello ${_students.join(", ")}.";
}

And then use the class:

var james = Student("James");
var sara = Student("Sara");
var lucy = Student("Lucy");

// Most IList methods are available:
var students = Students().add(james).addAll([sara, lucy]);

expect(students, [james, sara, lucy]);

// Prints: "Hello James, Sara, Lucy."
print(students.greetings()); 

Flushing the IList

As explained, fast_immutable_collections is fast because it creates a new collection by internally “composing” the source collection with some other information, saving only the difference between the source and destination collections, instead of copying the whole collection each time.

After a lot of modifications, these composed collections may end up with lots of information to coordinate the composition, and may become slower than a regular mutable collection.

The loss of speed depends on the type of collection. For example, the IList doesn’t suffer much from deep compositions, while the ISet and the IMap will take more of a hit.

If you call flush in an immutable collection, it will internally remove all the composition, making sure the is perfectly optimized again. For example:

var ilist = [1.2].lock.add([3, 4]).add(5);
ilist.flush;

Please note, flush is a getter which returns the exact same instance, just so that you can chain other methods to it if you want. But it does NOT create a new list. It actually just optimizes the current list, internally.

If you flush a list which is already flushed, nothing will happen, and it won’t take any time to flush the list again. So you don’t need to worry about flushing the list more than once.

Also, note flush just optimizes the list internally, and no external difference will be visible. So, for all intents and purposes, you may consider that flush doesn’t mutate the list.

Auto-flush

Depending on the global configuration, the collections will flush automatically for you, once per asynchronous gap, as soon as you use them again.

For example, suppose you take a collection and add and remove a lot of items, synchronously. No flushing will take place during these process. After the asynchronous gap, as soon as you try to get, add or remove an item from it, it will flush automatically.

The global configuration default is to have auto-flush on.

Advanced usage

There are a few ways to lock and unlock a list, which will have different results in speed and safety.

Suppose you have some List. These are your options to create an IList from it:

  • .lock will create an internal defensive copy of the original list, which will be used to back the IList. This is the same doing: IList(list).

  • .lockUnsafe is fast, since it makes no defensive copies of the list. However, you should only use this with a new list you’ve created yourself, when you are sure no external copies exist. If the original list is modified, it will break the IList and any other derived lists in unpredictable ways. Use this at your own peril. This is the same doing: IList.unsafe(list). Note you can optionally disallow unsafe constructors in the global configuration by doing: disallowUnsafeConstructors = true (and then optionally preventing further configuration changes by calling lockConfig()).

These are your options to obtain a regular List back from an IList:

  • .unlock unlocks the list, returning a regular (mutable, growable) List. This returned list is “safe”, in the sense that is newly created, independent of the original IList or any other lists.

  • .unlockView unlocks the list, returning a safe, unmodifiable (immutable) List view. The word “view” means the list is backed by the original IList. This is very fast, since it makes no copies of the IList items. However, if you try to use methods that modify the list, like add, it will throw an UnsupportedError. It is also very fast to lock this list back into an IList.

  • unlockLazy unlocks the list, returning a safe, modifiable (mutable) List. Using this is very fast at first, since it makes no copies of the IList items. However, if (and only if) you use a method that mutates the list, like add, it will unlock it internally (make a copy of all IList items). This is transparent to you, and will happen at most only once. In other words, it will unlock the IList lazily, only if necessary. If you never mutate the list, it will be very fast to lock this list back into an IList.

IMapOfSets

When you lock a Map<K, V> it turns into an IMap<K, V>.

However, a locked Map<K, Set<V>> turns into an IMapOfSets<K, V>.

/// Map to IMap
IMap<K, V> map = {'a': 1, 'b': 2}.lock;

/// Map to IMapOfSets
IMapOfSets<K, V> map = {'a': {1, 2}, 'b': {3, 4}}.lock;

The IMapOfSets lets you add / remove values, without having to think about the sets that contain them. For example:

IMapOfSets<K, V> map = {'a': {1, 2}, 'b': {3, 4}}.lock;

// Prints {'a': {1, 2, 3}, 'b': {3, 4}}
print(map.add('a', 3)); 

Suppose you want to create an immutable structure that lets you arrange Students into Courses. Each student can be enrolled into one or more courses.

This can be modeled by a map where the keys are the courses, and the values are sets of students.

Implementing structures that nest immutable collections like this can be quite tricky. That’s when an IMapOfSets comes handy:

class StudentsPerCourse {   
  final IMapOfSets<Course, Student> imap;
  StudentsPerCourse([Map<Course, Set<Student>> studentsPerCourse]) : _studentsPerCourse = (studentsPerCourse ?? {}).lock;
  StudentsPerCourse._(this._studentsPerCourse);
  ISet<Course> courses() => imap.keysAsSet;
  ISet<Student> students() => imap.valuesAsSet;
  IMapOfSets<Student, Course> getCoursesPerStudent() => imap.invertKeysAndValues();
  IList<Student> studentsInAlphabeticOrder() => imap.valuesAsSet.toIList(compare: (s1, s2) => s1.name.compareTo(s2.name));
  IList<String> studentNamesInAlphabeticOrder() => imap.valuesAsSet.map((s) => s.name).toIList();
  StudentsPerCourse addStudentToCourse(Student student, Course course) => StudentsPerCourse._(imap.add(course, student));
  StudentsPerCourse addStudentToCourses(Student student, Iterable<Course> courses) => StudentsPerCourse._(imap.addValuesToKeys(courses, [student]));
  StudentsPerCourse addStudentsToCourse(Iterable<Student> students, Course course) => StudentsPerCourse._(imap.addValues(course, students));
  StudentsPerCourse addStudentsToCourses(Map<Course, Set<Student>> studentsPerCourse) => StudentsPerCourse._(imap.addMap(studentsPerCourse));
  StudentsPerCourse removeStudentFromCourse(Student student, Course course) => StudentsPerCourse._(imap.remove(course, student));
  StudentsPerCourse removeStudentFromAllCourses(Student student) => StudentsPerCourse._(imap.removeValues([student]));
  StudentsPerCourse removeCourse(Course course) => StudentsPerCourse._(imap.removeSet(course));
  Map<Course, Set<Student>> toMap() => imap.unlock;
  int get numberOfCourses => imap.lengthOfKeys;  
  int get numberOfStudents => imap.lengthOfNonRepeatingValues;
}        

Note: The IMapOfSets configuration (ConfigMapOfSets.allowEmptySets) lets you choose if empty sets should be removed or not. In the above example, this would mean having courses with no students, or else removing the course automatically when the last student leaves.

/// Using the default configuration: Empty sets are removed.
StudentsPerCourse([Map<Course, Set<Student>> studentsPerCourse]) 
   : _studentsPerCourse = (studentsPerCourse ?? {}).lock;

/// Specifying that a course can be empty (have no students).
StudentsPerCourse([Map<Course, Set<Student>> studentsPerCourse]) 
   : _studentsPerCourse = (studentsPerCourse ?? {}).lock
       .withConfig(ConfigMapOfSets(allowEmptySets: true));



1. Why Immutable Collections (and immutable objects in general) are useful?

2. Benchmarks Summary

3. The Motivation for the IMapOfSets Collection Class

4. The Implementation’s Idea

Basically, behind the scenes, this is what happens when you pass a List to an IList, the other collection objects follow the same idea:

  1. A new copy of the object is made with List.of, so the original object won’t be modified at all.
    1. When you add an element to the IList, it will be registered as an immutable property behind the scenes, and not added to the original List.
    2. When you add a collection of elements (Iterable) to the IList, it will also be registered as an immutable property, as a new copy of the Iterable if necessary to ensure the original won’t be changed.

5. Other Resources & Documentation

The docs folder features information which might be useful for you either as an end user or a developer:

File Purpose
different_fixed_list_initializations.dart Different ways of creating an immutable list in pure Dart and their underlying implementations
resources.md Resources for studying the topic of immutable collections
uml.puml The UML diagram for this package (Uses PlantUML)

6. For the Developer or Contributor

6.1. Formatting

This project uses 100-character lines instead of the typical 80. If you’re on VS Code, simply add this line to your settings.json:

"dart.lineLength": 100,

If you’re going to use the dartfmt CLI, you can add the -l option when formatting, e.g.:

dartfmt -l 100 -w . 

Download Details:

Author: marcglasberg

Source Code: https://github.com/marcglasberg/fast_immutable_collections

#flutter #dart #mobile-apps

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Immutable lists and other collections, which are as fast as their native Flutter
Autumn  Blick

Autumn Blick

1598839687

How native is React Native? | React Native vs Native App Development

If you are undertaking a mobile app development for your start-up or enterprise, you are likely wondering whether to use React Native. As a popular development framework, React Native helps you to develop near-native mobile apps. However, you are probably also wondering how close you can get to a native app by using React Native. How native is React Native?

In the article, we discuss the similarities between native mobile development and development using React Native. We also touch upon where they differ and how to bridge the gaps. Read on.

A brief introduction to React Native

Let’s briefly set the context first. We will briefly touch upon what React Native is and how it differs from earlier hybrid frameworks.

React Native is a popular JavaScript framework that Facebook has created. You can use this open-source framework to code natively rendering Android and iOS mobile apps. You can use it to develop web apps too.

Facebook has developed React Native based on React, its JavaScript library. The first release of React Native came in March 2015. At the time of writing this article, the latest stable release of React Native is 0.62.0, and it was released in March 2020.

Although relatively new, React Native has acquired a high degree of popularity. The “Stack Overflow Developer Survey 2019” report identifies it as the 8th most loved framework. Facebook, Walmart, and Bloomberg are some of the top companies that use React Native.

The popularity of React Native comes from its advantages. Some of its advantages are as follows:

  • Performance: It delivers optimal performance.
  • Cross-platform development: You can develop both Android and iOS apps with it. The reuse of code expedites development and reduces costs.
  • UI design: React Native enables you to design simple and responsive UI for your mobile app.
  • 3rd party plugins: This framework supports 3rd party plugins.
  • Developer community: A vibrant community of developers support React Native.

Why React Native is fundamentally different from earlier hybrid frameworks

Are you wondering whether React Native is just another of those hybrid frameworks like Ionic or Cordova? It’s not! React Native is fundamentally different from these earlier hybrid frameworks.

React Native is very close to native. Consider the following aspects as described on the React Native website:

  • Access to many native platforms features: The primitives of React Native render to native platform UI. This means that your React Native app will use many native platform APIs as native apps would do.
  • Near-native user experience: React Native provides several native components, and these are platform agnostic.
  • The ease of accessing native APIs: React Native uses a declarative UI paradigm. This enables React Native to interact easily with native platform APIs since React Native wraps existing native code.

Due to these factors, React Native offers many more advantages compared to those earlier hybrid frameworks. We now review them.

#android app #frontend #ios app #mobile app development #benefits of react native #is react native good for mobile app development #native vs #pros and cons of react native #react mobile development #react native development #react native experience #react native framework #react native ios vs android #react native pros and cons #react native vs android #react native vs native #react native vs native performance #react vs native #why react native #why use react native

Google's Flutter 1.20 stable announced with new features - Navoki

Flutter Google cross-platform UI framework has released a new version 1.20 stable.

Flutter is Google’s UI framework to make apps for Android, iOS, Web, Windows, Mac, Linux, and Fuchsia OS. Since the last 2 years, the flutter Framework has already achieved popularity among mobile developers to develop Android and iOS apps. In the last few releases, Flutter also added the support of making web applications and desktop applications.

Last month they introduced the support of the Linux desktop app that can be distributed through Canonical Snap Store(Snapcraft), this enables the developers to publish there Linux desktop app for their users and publish on Snap Store.  If you want to learn how to Publish Flutter Desktop app in Snap Store that here is the tutorial.

Flutter 1.20 Framework is built on Google’s made Dart programming language that is a cross-platform language providing native performance, new UI widgets, and other more features for the developer usage.

Here are the few key points of this release:

Performance improvements for Flutter and Dart

In this release, they have got multiple performance improvements in the Dart language itself. A new improvement is to reduce the app size in the release versions of the app. Another performance improvement is to reduce junk in the display of app animation by using the warm-up phase.

sksl_warm-up

If your app is junk information during the first run then the Skia Shading Language shader provides for pre-compilation as part of your app’s build. This can speed it up by more than 2x.

Added a better support of mouse cursors for web and desktop flutter app,. Now many widgets will show cursor on top of them or you can specify the type of supported cursor you want.

Autofill for mobile text fields

Autofill was already supported in native applications now its been added to the Flutter SDK. Now prefilled information stored by your OS can be used for autofill in the application. This feature will be available soon on the flutter web.

flutter_autofill

A new widget for interaction

InteractiveViewer is a new widget design for common interactions in your app like pan, zoom drag and drop for resizing the widget. Informations on this you can check more on this API documentation where you can try this widget on the DartPad. In this release, drag-drop has more features added like you can know precisely where the drop happened and get the position.

Updated Material Slider, RangeSlider, TimePicker, and DatePicker

In this new release, there are many pre-existing widgets that were updated to match the latest material guidelines, these updates include better interaction with Slider and RangeSliderDatePicker with support for date range and time picker with the new style.

flutter_DatePicker

New pubspec.yaml format

Other than these widget updates there is some update within the project also like in pubspec.yaml file format. If you are a flutter plugin publisher then your old pubspec.yaml  is no longer supported to publish a plugin as the older format does not specify for which platform plugin you are making. All existing plugin will continue to work with flutter apps but you should make a plugin update as soon as possible.

Preview of embedded Dart DevTools in Visual Studio Code

Visual Studio code flutter extension got an update in this release. You get a preview of new features where you can analyze that Dev tools in your coding workspace. Enable this feature in your vs code by _dart.previewEmbeddedDevTools_setting. Dart DevTools menu you can choose your favorite page embed on your code workspace.

Network tracking

The updated the Dev tools comes with the network page that enables network profiling. You can track the timings and other information like status and content type of your** network calls** within your app. You can also monitor gRPC traffic.

Generate type-safe platform channels for platform interop

Pigeon is a command-line tool that will generate types of safe platform channels without adding additional dependencies. With this instead of manually matching method strings on platform channel and serializing arguments, you can invoke native class and pass nonprimitive data objects by directly calling the Dartmethod.

There is still a long list of updates in the new version of Flutter 1.2 that we cannot cover in this blog. You can get more details you can visit the official site to know more. Also, you can subscribe to the Navoki newsletter to get updates on these features and upcoming new updates and lessons. In upcoming new versions, we might see more new features and improvements.

You can get more free Flutter tutorials you can follow these courses:

#dart #developers #flutter #app developed #dart devtools in visual studio code #firebase local emulator suite in flutter #flutter autofill #flutter date picker #flutter desktop linux app build and publish on snapcraft store #flutter pigeon #flutter range slider #flutter slider #flutter time picker #flutter tutorial #flutter widget #google flutter #linux #navoki #pubspec format #setup flutter desktop on windows

Terry  Tremblay

Terry Tremblay

1598396940

What is Flutter and why you should learn it?

Flutter is an open-source UI toolkit for mobile developers, so they can use it to build native-looking** Android and iOS** applications from the same code base for both platforms. Flutter is also working to make Flutter apps for Web, PWA (progressive Web-App) and Desktop platform (Windows,macOS,Linux).

flutter-mobile-desktop-web-embedded_min

Flutter was officially released in December 2018. Since then, it has gone a much stronger flutter community.

There has been much increase in flutter developers, flutter packages, youtube tutorials, blogs, flutter examples apps, official and private events, and more. Flutter is now on top software repos based and trending on GitHub.

Flutter meaning?

What is Flutter? this question comes to many new developer’s mind.

humming_bird_dart_flutter

Flutter means flying wings quickly, and lightly but obviously, this doesn’t apply in our SDK.

So Flutter was one of the companies that were acquired by **Google **for around $40 million. That company was based on providing gesture detection and recognition from a standard webcam. But later when the Flutter was going to release in alpha version for developer it’s name was Sky, but since Google already owned Flutter name, so they rename it to Flutter.

Where Flutter is used?

Flutter is used in many startup companies nowadays, and even some MNCs are also adopting Flutter as a mobile development framework. Many top famous companies are using their apps in Flutter. Some of them here are

Dream11

Dream11

NuBank

NuBank

Reflectly app

Reflectly app

Abbey Road Studios

Abbey Road Studios

and many more other apps. Mobile development companies also adopted Flutter as a service for their clients. Even I was one of them who developed flutter apps as a freelancer and later as an IT company for mobile apps.

Flutter as a service

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Adobe XD plugin for Flutter with CodePen Tutorial

Recently Adobe XD releases a new version of the plugin that you can use to export designs directly into flutter widgets or screens. Yes, you read it right, now you can make and export your favorite design in Adobe XD and export all the design in the widget form or as a full-screen design, this can save you a lot of time required in designing.

What we will do?
I will make a simple design of a dialogue box with a card design with text over it as shown below. After you complete this exercise you can experiment with the UI. You can make your own components or import UI kits available with the Adobe XD.

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Sagar Shende

Sagar Shende

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Flutter - How to Implement Flutter Native Ads | Flutter AdMob Tutorial

In this video, I am going to teach you how to implement native ads in the flutter app, But Official Flutter_admob is not supported Native ads right now. So, If you are iOS Developer then you wait for official Confirmation.
As we can say Flutter is Fast & Really Easy Way to Make Android apps.

Flutter Native ads will help you grow your revenue of the App which will look alike your App Ui Or You can customize Ads According to ur App Design. Flutter ads Or Admob is the great way to Monetize your Flutter Apps

Github Code: https://github.com/sagarshende23/flutter_native_ads_demo

Flutter - How to Implement Flutter Native Ads | Flutter AdMob Tutorial

Github Profile: https://sagarshende23.github.io/

Check out our Website for more Flutter Tutorials
https://alltechsavvy.com/

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