Kotlin Coroutines for Mobile App Development

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Questions and Answers

What is the expected number of smartphone users in 2020?

3.5 billions

What is the primary benefit of a mobile application for a business?

It adds value to the business

Why do businesses prefer mobile applications over mobile-friendly websites?

Because mobile applications can add more value to the business

What is the main feature of a mobile phone that has changed over time?

Its various incredible features and opportunities Signup and view all the answers

What is the primary purpose of a mobile application for a business?

To enhance the business value Signup and view all the answers

What is the expected outcome of a mobile application for a business?

It will add value to the business Signup and view all the answers

What replaced the Eclipse Android Development Tools (E-ADT) as the primary IDE for native Android application development?

Android Studio Signup and view all the answers

What is the preferred language for Android app development as of May 7, 2019?

Kotlin Signup and view all the answers

What is a benefit of using Kotlin, according to 67% of professional developers?

Increased productivity Signup and view all the answers

What is a feature of Kotlin that helps avoid common programming mistakes?

Null safety Signup and view all the answers

What is a benefit of using Kotlin for Android app development?

20% decreased crash rate Signup and view all the answers

What is a feature of Kotlin that allows for easy integration with Java-based code?

Interoperability Signup and view all the answers

What is a characteristic of Kotlin code, compared to other programming languages?

Concise and expressive Signup and view all the answers

What is a benefit of using Kotlin's concise syntax?

Less boilerplate code is required Signup and view all the answers

What is the primary benefit of using Kotlin coroutines?

Simplifying background task management Signup and view all the answers

What is the purpose of using 'val' in Kotlin variable declaration?

To declare a variable that never changes Signup and view all the answers

What is the key feature of Kotlin's type inference?

The compiler infers the type based on the assigned value Signup and view all the answers

What is the default behavior of Kotlin variables regarding null values?

They cannot hold null values by default Signup and view all the answers

What is the purpose of using 'var' in Kotlin variable declaration?

To declare a variable whose value can change Signup and view all the answers

How do you enable a variable to hold a null value in Kotlin?

By making it a nullable type Signup and view all the answers

What is a key characteristic of asynchronous code in Kotlin?

It is easier to work with than blocking code Signup and view all the answers

What is the relationship between coroutines and asynchronous code in Kotlin?

Coroutines simplify asynchronous code Signup and view all the answers

Study Notes

Kotlin Coroutines and Asynchronous Code

Kotlin coroutines make asynchronous code as easy to work with as blocking code
Coroutines simplify background task management for tasks such as network calls and accessing local data

Variables in Kotlin

Use val for a variable whose value never changes
Use var for a variable whose value can change
val variables cannot be reassigned

Type Inference in Kotlin

The Kotlin compiler can infer the type based on the assigned value

Null Safety in Kotlin

Kotlin variables cannot hold null values by default
A variable must be of a nullable type to hold a null value
Nullable types are required to hold null values

Mobile Application Development

The number of smartphone users is growing, with 3.5 billion users in 2020
Business organizations prefer mobile applications over mobile-friendly websites
A good mobile application adds value to a business

Android Studio

Android Studio is the primary IDE for native Android application development
Android Studio replaced Eclipse ADT as the primary IDE
Android Studio was announced on May 16, 2013, at the Google I/O conference

Kotlin as the Preferred Language for Android App Development

Kotlin replaced Java as Google's preferred language for Android app development in 2019
Java is still supported, as is C++
Kotlin is a modern, concise, and safe programming language

Benefits of Kotlin

Kotlin is expressive and concise, allowing for more to be done with less code
Kotlin reduces the amount of boilerplate code
67% of professional developers who use Kotlin say it has increased their productivity
Kotlin has many language features to help avoid common programming mistakes, such as null pointer exceptions
Android apps that contain Kotlin code are 20% less likely to crash
Kotlin is 100% interoperable with the Java programming language