Coding in kotlin
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Kotlin is a new, pragmatic, safe, concise, and interoperable programming language that serves as an alternative to Java, enabling developers to write projects with less code and fewer issues. It features nullable types which help prevent null pointer exceptions at compile time, enhancing reliability and maintainability. Kotlin can be used for server-side code, mobile applications on Android, and even compiled to JavaScript for browser execution.
![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-160129021619/85/Coding-in-kotlin-3-320.jpg)
Coding in kotlin
- 1. Coding in Kotlin Debmalya Jash
- 2. Discussion Summary • Kotlin • What ? • Why? • Where? • How?
- 3. 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]
- 6. Explanation • We declare a 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 primary goal 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 you cry 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-side code (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 statically typed 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.
- 11. How?
- 12. Reference • Kotlin In Action • 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