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![About Kotlin
• New programming language that is a pragmatic, safe, concise, and interoperable alternative to
Java.
• With Kotlin, you can implement your projects with less code, a higher level of abstraction, and
fewer annoyances.
• Statically typed programming language (Not like other dynamically typed programming languages
Groovy, JRuby).
• [Note: However, in contrast to Java, Kotlin does not require you to specify the type of every
variable explicitly in your source code. In many cases, the type of a variable can automatically be
determined from context, and in those cases Kotlin allows you to omit the type. Here’s the simplest
possible example of this:
val x = 1]](https://image.slidesharecdn.com/codinginkotlin-160129021149/75/Coding-in-kotlin-3-2048.jpg)
Uploaded byDebmalya Jash
Coding in kotlin
Kotlin is a modern programming language that serves as a pragmatic and streamlined alternative to Java, allowing developers to write safer and more concise code without needing to specify types for every variable. It is statically typed, supports nullable types to mitigate NullPointerExceptions, and can be used in various environments such as server-side applications and mobile apps for Android and iOS. Its benefits include improved performance, reliability, and maintainability, along with enhanced tool support for developers.
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Coding in kotlin
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- 2. Discussion Summary • Kotlin •What ? • Why? • Where? • How?
- 3. About Kotlin • Newprogramming language that is a pragmatic, safe, concise, and interoperable alternative to Java. • With Kotlin, you can implement your projects with less code, a higher level of abstraction, and fewer annoyances. • Statically typed programming language (Not like other dynamically typed programming languages Groovy, JRuby). • [Note: However, in contrast to Java, Kotlin does not require you to specify the type of every variable explicitly in your source code. In many cases, the type of a variable can automatically be determined from context, and in those cases Kotlin allows you to omit the type. Here’s the simplest possible example of this: val x = 1]
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- 6. Explanation • We declarea simple data class with two properties: name and age. Age is null by default (if it isn’t specified). While creating a list of persons, you omit Alice’s age, so the default value null is used. Then you use the function maxBy to find the oldest person in a list. The lambda expression passed to the function takes one parameter, and we use "it" as the default name of that parameter. The "elvis" operator ?: returns zero if the age is null. Because Alice’s age is not specified, it is considered to be zero, so Bob wins the prize of being the oldest one.
- 7. Why? • The primarygoal of Kotlin is to work as a more concise, more productive and safer alternative to Java, suitable in all contexts where Java is used today.
- 8. NullPointerException • Do youcry out loud every time you see a Null Pointer Exception in your bug tracker? Then Kotlin is your solution! • Kotlin’s support for nullable types, which lets you write more reliable programs by detecting possible null pointer exceptions at compile time.
- 9. Where? • Building server-sidecode (typically backends of Web applications). • Building mobile applications that run on Android devices. • But Kotlin works in other contexts as well. For example, you can use RoboVM 1 to run Kotlin code on iOS devices. Or you can use Kotlin together with JavaFX 2 to build desktop applications. • In addition to Java, Kotlin also can be compiled to JavaScript, allowing you to run Kotlin code in the browser.
- 10. Benefit of staticallytyped language • Performance: Calling methods is faster because in most cases there is no need to figure out at runtime which method needs to be called. • Reliability: The compiler verifies the correctness of the program, so there are fewer opportunities for crashes at runtime. • Maintainability: Working with unfamiliar code is easier because you can see what kind of objects the code is working with. • Tool support: Static typing enables reliable refactorings, code completion and other IDE features.
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- 12. Reference • Kotlin InAction • Kotlin Programming Language • Kotlin Language Documentation • Kotlin In Action Forum • Kotlin GitHub • https://github.com/JetBrains/Exposed • https://github.com/jetbrains/anko • Kotlin Tutorials • Kotlin Playground