Question 1

Would you choose Flutter over other mobile app developing tools?

Accepted Answer

Yes, I would prefer Flutter over Java and React Native for mobile app development. With Flutter, I can work on cross-platform development. Also, it is easy and flexible when I use Flutter for programming. Flutter also allows me to build apps faster compared to its competitors.

Question 2

What do you think are the shortcomings of using Flutter?

Accepted Answer

As a relatively new tool, you may have some challenges when using Flutter. Some of these are:   
 
 Limited third-party libraries  
 Flutter release size larger than expected  
 Inability of Dart to compete with other OOP languages such as Java, C#  
 No support from mobile ad platforms  
 Limited reach to its audience

Question 3

What are the main elements of Flutter?

Accepted Answer

Flutter engine  
 Widgets  
 Design-specific widgets  
 Foundation Library

Question 4

Which are the best editors to use with Flutter?

Accepted Answer

Visual Studio  
 Codemagic  
 IntelliJ Idea  
 Emac  
 Android Studio

Question 5

What do you know about the build models in Flutter?

Accepted Answer

Debug is used for app testing. On Android Studio, you can find a green play button on the top panel.  
“Flutter run”  
 Profile maintains a debugging ability enough to profile your app's performance. It also has the performance as the release mode.  
“Flutter run -- profile”  
 Release is used to deploy apps on marketplaces.  
“Flutter run - - release”

Question 6

Which animation would you use if you have to represent real world behavior in Flutter?

Accepted Answer

It depends on what behavior I want to represent. There are many animation options to choose from, including Physics-based animation, Tween animation, Curved animation, Pre-canned animation, and Hero animation.

Question 7

Can you tell us about popular apps that use Flutter?

Accepted Answer

Google Ads:  It is a mobile application that allows you to manage Google ad campaigns directly from a smartphone.   
 Hamilton:  It was created for the Broadway musical Hamilton’s fans. It includes a karaoke function, a regular quiz game, access to a variety of Hamilton lottery games, as well as exclusive videos and slideshows.   
 KlasterMe:  It is a popular content-sharing site that allows you to build your page and add images, blogs, essays, surveys, and entries.   
 Reflectly:  It is an AI-enabled personal journaling application that helps users express their emotions and care for their mental health.

Question 8

How would you execute code only in debug mode?

Accepted Answer

import 'package:flutter/foundation.dart' as Foundation;     
 
The next step is to use kReleaseMode as follows:  
 
if (Foundation.kReleaseMode){     // is Release Mode??    
   print('release mode');    
} else {    
             print('debug mode');    
}

Question 9

What are Null-aware operators in Flutter?

Accepted Answer

In Dart, Null-aware operators can be used to create computations based on whether or not a value is null.

The "??=" assignment operator assigns a value to a variable only if it is null. 
int a;                           // a is initialized with null value.     
a ??= 10;      
print(a);                      // It will print 10.

The "??" null-aware operator computes and returns the value between two expressions. Expression 1 is checked for nullness in the first step. If that’s the case, its value is returned. If no, the second expression evaluated, and its value is returned.

print(5 ?? 10);            // It will print 5.    
print(null ?? 10);       // It will print 10.

The “?.” Safe Navigation Operator is also known as the Elvis operator. We can use it to call a method/getter on an object. However, this can be done only if the object isn't null, or the method will return null.

obj?.child?.child?.getter //The expression returns null if obj, child1, or child2 are null. If not, the getter is called and returned.

Question 10

What is the use of Mixins when working with Flutter?

Accepted Answer

Dart does not support multiple inheritances. With mixins, you can implement multiple inheritances in Flutter/Dart and easily write reusable class code in multiple class hierarchy levels. Mixins can also be used to provide some utility functions, like RenderSliverHelpers in Flutter.

Question 11

What are the two database packages used in Flutter?

Accepted Answer

Firebase Package:  It offers access to and control over the cloud database. With Firebase, you can have a NoSQL database that can manage data retrieval and storage through JSON protocol. It also offers data sync and quick loading, which makes it one of the most suitable options for Flutter Apps.

SQFlite database:  This is used to access and modify the SQLite database. It gives you full control over the database, queries, and relationships.

Question 12

What is “Tree shaking” in Flutter?

Accepted Answer

During development, when you need to remove an unused module in the bundle the tree shaking method is used. It is a kind of optimization technique that removes dead code that occur while importing or exporting codes.

Question 13

How can you import packages for your project when using Flutter?

Accepted Answer

The pubspec.yaml file is used to import packages in the Dart code. It contains project dependencies, general project settings, and project assets and can be used to set application constraints.

Question 14

What is the use of HTTP package in Flutter?

Accepted Answer

It is used by Flutter developers to send HTTP requests and receive HTTP responses from APIs or web servers. To fetch or send data to the server, Flutter apps must communicate with APIs or web servers. The HTTP package makes it easy to make HTTP requests in Flutter.

Question 15

If the return type for a function for a specific function is not specified, what will be the default return type?

Accepted Answer

Flutter uses the Dart programming language for development. In Dart, if the return type for a function is not specified, the default return type will be dynamic. If a function is declared without specifying a return type in Flutter, Dart assumes that the function can return any type of value and assigns the dynamic type to the return value by default.

Hire Elite, Vetted Flutter Developer

Job Description

Job Responsibilities

Qualifications

Technical Skills

Other Skills

Soft Skills

What is Flutter?

What can you build as a Flutter specialist?

Frequently Asked Questions

Looking to hire?

Are you a developer?