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Ans:Dart may be a general-purpose, object-oriented programing language originally developed by Google.Dart is an Open Source programing language developed by Google in 2011. The Dart programing language is majorly deployed for creating the frontend UI for mobile and web apps. It plays a serious role within the development of Flutter apps.
Dart supports all the common concepts of programming languages like interfaces, classes, functions, and it doesn't support array directly. It supports the gathering , which is employed to represent various data structures like generics, arrays, and optional typing.
Ans: Many organizations across the planet are building apps using flutter. this is often thanks to , its ability to create native apps in varied categories. Therefore, the foremost popular apps built with flutter are;
Ans: Dart is an object-oriented, garbage-collected programing language .
Dart was chosen because the language of Flutter for the subsequent reason:
programmatic layout is straightforward to read and visualize. And with all the layout in one language and in one place, it's easy for Flutter to supply advanced tooling that creates layout a snap.
Ans: Flutter IDE and tools make flutter development faster, therefore, boosting the developer’s workflow. Above all,
flutter IDE and tools are good for developing mobile apps. As a result, you'll need some plugins. Usually, the plugins help with Dart compiling,
code analysis, and flutter development.
Therefore, the simplest editors for flutter development are; Android studio and VS code.
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Ans: Google is that the developer of Dart.
Ans: you'll install it any OS like Windows, Linus, MacOS etc
Ans : In Dart, rune is an integer representing Unicode code point.
Ans : you'll install it any OS like Windows, Linus, MacOS etc
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Example :
Future sumStream(Stream stream) async {
var sum = 0;
await for (var value in stream) {
sum += value;
}
return sum;
}
Ans : This an easy but quite tricky flutter interview question.
First of all, Flutter and React Native is employed in developing hybrid native apps for iOS and Android from one codebase.
React Native is older within the market since it had been released on March 26, 2015.
While flutter was introduced in May 2017.
Consequently, it's difficult to settle on the simplest between the 2 , because, all of them have great features.
Therefore, the developer has the duty to make a decision on which one to use while running a project.
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Ans: In Dart, this keyword refers to the present instance of the category .
void main() {
Car c1 = new Car(‘E1001’);
}
class Car {
String engine;
Car(String engine) {
this.engine = engine;
print(“The engine is : “);
}
}
Ans: During the primary time flutter app development, a device-specific APK or IPA file is made .
Consequently, XCode and Gradle are utilized in building the files, thus, taking time. Thereafter, when the app is restarted,
flutter patches the changes on the prevailing app, leading to , a super-fast refresh.
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Ans: First of all, it's important to notice that Android Studio has tools that make structuring flutter code simple.
Hence, the 2 main aspects are;
Alt + Enter/ Command + Enter
This enables developers to wrap, swap, and take away widgets during a complex hierarchy. to seek out this, direct your cursor to the widget declaration and click on on the keys to access more options.
DartFMT
DartFMT is great since it formats your code to make sure a clean identification and hierarchy.
Additionally, it makes your codes easier to figure with by just twiddling with a couple of brackets.
Ans :The following command is employed to compile Dart into dart2js – – out=.js .dart
Ans: Async functions are normal functions with some sugar on top. The function variable type just must specify that it returns a Future:
class Example {
Future Function() asyncFuncVar;
Future asyncFunc() async => print('Do async stuff...');
Example() {
asyncFuncVar = asyncFunc;
asyncFuncVar().then((_) => print('Hello'));
}
}
void main() => Example();
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Similarity:
Future and Stream both work asynchronously.
Both have some potential value.
Differences:
A Stream may be a combination of Futures.
Future has just one response but Stream could have any number of Response.
Ans : Normally, functions are passes to the widget if they provide the response,
“invoke this function when something happens”. In Dart, functions are first-class objects and may be passed to parameters of other functions.
Finally, interfaces that use Callbacks have much boilerplate code for a traditional callback.
Java callback
utton.setOnClickListener(new View.OnClickListener() {
@override
public void onClick(View view) {
// Do something here
}
}
);
Dart Equivalent
FlatButton(
onPressed: () {
// Do something here
}
)
Ans: whenComplete will fire a function either when the longer term completes with a mistake or not, while .then returns a replacement Future which is completed with the results of the decision to onValue (if this future completes with a value) or to onError (if this future completes with an error)
.whenCompleted is that the asynchronous equivalent of a "finally" block.
Ans : There are various methods to control string that are given in table:
String Methods Description
toLowerCase():It converts all the string character into small letter .
toUpperCase():It converts all the string character into capital .
trim():It returns the string with none leading and trailing whitespace.
compareTo():It compare objects to a different objects.
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There are several benefits related to using flutter. For that reason, i counsel you to use it in your next project and see the benefits .
Particularly, below are a number of the advantages of using flutter;