Android-Kotlin Digest #1

Planning to journal updates on my learning in Android and Kotlin development. This would be mostly from an ​iOS developer's perspective. I will be writing gist of what I learnt today and anything specific interesting.

 To start off below are some things I learnt in Kotlin and differences with Swift.

 Some basics of Kotlin:

  var of mutable variables val of immutable variables / constants

Adding variable value in a string "The value of variable is $variable_name" Suffix ? for variables holding null values

 Also has a javascript big arrow => function like syntax:
  fun sum(a: Int, b: Int) : Int = a + b

Conditionals:
`if (obj is String) { ... }`
and not checks `if (obj !is String) { ... }`

 I found switch statements most unique till now:

when (obj) { 
    1          -> "One" // (case) 
    "Hello"    -> "Greeting" // (case) 
    is Long    -> "Long" // (case) 
    !is String -> "Not a string" // (case) 
    else       -> "Unknown" // (default case) 
} 

Ranges are specified as 0..end or 0..end+1 or 0..list.lastIndex

Then we have progressions:

  for (x in 1..10 step 2) { print(x) } 
Jumps alternate steps with keyword `step` and value 2.
Here result would be: `13579`


  for (x in 9 downTo 0 step 3) { print(x) }
Jumps three steps but in reverse order with keyword `downTo`.
Here result would be: `9630`

-- Happy coding!!--