Gain insights into Kotlin’s basics, including variable declarations, data types, conditions, loops, and functions. Discover how to write simple Kotlin scripts and transition to advanced programming.

Kotlin is quickly joining the ranks of the most popular programming languages. Now that Google supports Kotlin for Android app development as the primary choice over Java, we’ll only see more developers making the switch. So if you’re looking to get started with Android app development, then you’ve come to the right place.

This course will be your guide on getting started with Kotlin. We’ll go over all the language basics including variable declarations, data types and the type system to conditions, loops, and functions.

After this course, you’ll be able to write simple Kotlin scripts and applications. With this solid understanding of the language basics, you’ll be able to more easily follow more advanced material covering functional and object-oriented programming.

Homam B.

What a brilliant course, its not too long so its fairly easy to get through in a weekend. Goes through the fundimentals of Kotlin in just the right amount of detail. I would recommend this as a first step into Kotlin language

"Brilliant course"

Patricio M.

I have completed the course and I have to say that it's extremely well done

The examples used are clear and easy to follow

The code is very clean and the instructor strives to write clear and concise code and he explains concepts very clearly

Kudos for a job well done!

"Extremely well done"

Alan J.

Clear explanations, and well organized. Highly recommended.

"Highly recommended"

Raphael A.

Excellent course. It's a beginner course in programming, but even as a Java programmer I've been able to remember a lot of things and get productive quickly in Kotlin. The course is well structured and the teacher knows the subject (I bought another course from the teacher).

"Excellent course"

Kotlin Crash Course for Programmers

## Conditions Using `when`

You can use `when` conditions to define different behaviors for a given set of distinct values. This is typically more concise than writing cascades of `if`-`else  if` conditions. For instance, you can replace the `if` condition above with a ``when`` condition to save around 30% of the lines of code in this example:

when (planet) {
  "Jupiter" -> println("Radius of Jupiter is 69,911km")
  "Saturn"  -> println("Radius of Saturn is 58,232km")
  else      -> println("No data for planet $planet")
}

The `when` keyword is followed by the variable it compares against. Then, each line defines the value to check on the left-hand side, followed by an arrow `->` and the block of code to execute if the value matches.

The code block on the right-hand side must be wrapped in curly braces unless it's a single expression. Optionally, an `else`-block can be used to define a block of code to run if no other case matches.

This language construct is basically the same as `switch` from languages like C or Java. However, it's more powerful since it supports more complex checks:

# Conditions Using `when`

You can use `when` conditions to define different behaviors for a given set of distinct values. This is typically more concise than writing cascades of `if`-`else  if` conditions. For instance, you can replace the `if` condition above with a ``when`` condition to save around 30% of the lines of code in this example:

Understand Kotlin's `when` construct and best practices of using `if` vs `when`.

Hello Kotlin!

Variables and Data Types

Conditions

Collections

Loops

Functions

Equality Checks

Exception Handling

Summary

Conditions with `when`

Conditions Using `when` #

Conditions with `when`

Conditions Using when #

Conditions Using `when` #