An Overview of Kotlin Programming Language & Its Features

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Android Application Development
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Kotlin Programming

1. Statically typed programming language for modern
   multiplatform applications.
2. Developed by JetBrains which has 20 faster
   compiler better multi platform projects
   support.
3. Kotlin is a new programming language that runs on
   JVM can be compiled to JavaScript source code.
4. It is fully supported programming language on
   Android Android 3.0 Beta version.
5. Google has announced official support for Kotlin
   Programming language for Android App Development.
   

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Kotlin Programming Features

• 1. Concise
• Kotlin is more concise reduces the amount of
  boilerplate code. For example we create a POJO
  with getters, setters, equals(), hashCode(),
  toString() and copy() in a single line.
• data class Customer(val name String, val email
  String, val company String)
• 2. Interoperable
• Kotlin is 100 interoperable with Java language.
  It means you can easily call java code from
  Kotlin Kotlin code from Java.
• val userClass userInstance.javaClass // From
  an instance

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Kotlin Programming Features

• 3. Open Source
• It is an open source programming language in
  which source code is available to the general
  public for use. Kotlin has open access to source
  code as
• The Kompiler Kotlin compiler,
• Build tools Ant and Maven integration, and
• IntelliJ IDEA plugin Kotlins native IDE.
• 4. Null Safety
• Avoid null pointer exception or null reference
  exception also known as The Billion Dollar
  Mistake.
• var b String? "abc"
• b null // ok

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Why to Choose Kotlin Over Java

• 1. Familiar Syntax
• Kotlin is also designed to have learning curve
  for Java developers. Java developers should find
  that most of the Kotlin syntax feels familiar
  for example, the code that's used to create a new
  class in Kotlin is very similar to Java
• class MainActivity AppCompatActivity()
• 2. String Interpolation
• String templates are a simple and effective way
  of embedding values, variables, or even
  expressions inside a string without the need for
  pattern replacement or string concatenation. This
  is called string interpolation.
• val x 4
• val y 7
• print("sum of x and y is x y") // sum of
  4 and 7 is 11

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Why to Choose Kotlin Over Java

• 3.Type Inference
• The compiler figure out the type of an expression
  from the information in the expression. A simple
  VAL is an easy case for the compiler because
  the type is clear from the right-hand side. This
  mechanism is called type inference. This reduces
  boilerplate code keeping the type safety.
• val a "abc" // type inferred to String
• val c Double 0.7 // type declared explicitly
• 4. Smart Cast
• In Kotlin Programming Language - The Kotlin
  compiler tracks your logic and auto-casts types
  if possible, which means no more instance of
  checks followed by explicit casts.
• if (obj is String)
• print(obj.toUpperCase()) // obj is now
  known to be a String

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Why to Choose Kotlin Over Java

• 5. Intuitive Equals
• You can stop calling equals() explicitly, because
  the operator now checks for structural
  equality.
• val john1 Person("John")
• val john2 Person("John")
• john1 john2 // true (structural equality)
• john1 john2 // false (referential equality)
• 6. Default Arguments
• No need to define several similar methods with
  varying arguments.
• fun build(title String, width Int 800,
  height Int 600)
• Frame(title, width, height)

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Why to Choose Kotlin Over Java

• 7. Named Arguments
• Combined with default arguments, named arguments
  eliminates the need for builders.
• build("PacMan", 400, 300) // equivalent
• build(title "PacMan", width 400, height
  300) // equivalent
• build(width 400, height 300, title
  "PacMan") // equivalent
• 8. Data Classes
• Its a POJO complete with toString(), equals(),
  hashCode(), and copy(), and unlike in Java it
  wont take up 100 lines of code.
• data class Person(val name String, var email
  String, var age Int)
• val john Person("John", "john_at_gmail.com", 112)

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Why to Choose Kotlin Over Java

• 9. Operating Overloading
• A predefined set of operators can be overloaded
  to improve readability.
• data class Vec(val x Float, val y Float)
• operator fun plus(v Vec) Vec(x v.x, y
  v.y)
• val v Vec(2f, 3f) Vec(4f, 1f)
• 10.Extension Functions
• Kotlin provides the ability to extend a class
  with new functionality without having to inherit
  from the class or use any type of design pattern
  such as Decorator. This is done by special
  declarations called extensions. Kotlin supports
  extension functions properties.
• fun String.replaceSpaces() String
• return this.replace(' ', '_')
• val formatted str.replaceSpaces()

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Learn More About Kotlin Programming

• https//kotlinlang.org/
• https//en.wikipedia.org/wiki/Kotlin_(programming_
  language)
• https//github.com/JetBrains/kotlin
• http//www.ficode.co.uk/blog/kotlin-programming-la
  nguage-android-app-development/
• https//www.kotlinconf.com/

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About Ficode
Ficode Technologies Limited is a Web, Mobile
Software Development Company in the United
Kingdom. We mainly focuses on delivering best
solutions for our client as per their
requirement. We have an expert team of
developers who can make your idea into reality
thats why, Ficode is one of the leading
mobile app development company in London. Our
team is fully focused on the latest technologies
as Kotlin, Java, PHP JavaScript a lot more.
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