How To Code In Kotlin

How To Articles

Kotlin is an incredibly versatile programming language that has gained a lot of popularity in recent years. As a developer, I have had the pleasure of working with Kotlin extensively and I must say, it has truly revolutionized the way I code. In this article, I will guide you through the process of coding in Kotlin, while adding some personal touches and commentary along the way.

Getting Started

Before diving into coding in Kotlin, it’s important to set up your development environment. You can download and install the Kotlin compiler from the official Kotlin website. Once installed, you can start coding either in a text editor or an Integrated Development Environment (IDE) of your choice.

Personally, I prefer using IntelliJ IDEA as my IDE for Kotlin development. It provides excellent support for Kotlin, including features like auto-complete, error checking, and debugging. If you’re new to Kotlin, I highly recommend using IntelliJ IDEA as it will make your coding experience much smoother.

Basic Syntax

Now that we have our development environment set up, let’s dive into the basic syntax of Kotlin. In Kotlin, a program consists of one or more functions. The main function is the entry point of the program, where the execution starts. Here’s an example of the basic structure of a Kotlin program:

fun main() {
// Your code here

As you can see, Kotlin uses the keyword “fun” to define functions. In this case, we have defined the main function without any parameters. You can start writing your code within the curly braces of the main function.

Variables and Data Types

In Kotlin, you can declare variables using the “val” or “var” keywords, depending on whether you want the variable to be mutable or immutable. Here’s an example:

val name: String = "John"
var age: Int = 25

Here, we have declared a variable called “name” of type String and assigned it the value “John”. We have also declared a variable called “age” of type Int and assigned it the value 25.

Kotlin supports a wide range of data types, including numbers, characters, booleans, and more. You can also define your own custom data types using classes and data classes.

Control Flow

Control flow statements allow you to control the flow of execution in your program. Kotlin provides several control flow statements, including if-else statements, for loops, while loops, and when expressions.

Here’s an example of an if-else statement in Kotlin:

val number = 10

if (number > 0) {
println("Number is positive")
} else if (number < 0) { println("Number is negative") } else { println("Number is zero") }

In this example, we check if the value of the variable "number" is positive, negative, or zero, and print the corresponding message.


Functions are an essential part of any programming language, and Kotlin is no exception. You can define your own functions in Kotlin using the "fun" keyword. Here's an example of a function that adds two numbers:

fun addNumbers(a: Int, b: Int): Int {
return a + b

In this example, we have defined a function called "addNumbers" that takes two parameters of type Int and returns their sum. You can call this function from anywhere in your code.


In this article, we have explored the basics of coding in Kotlin. We started by setting up our development environment, then delved into the syntax, data types, control flow, and functions in Kotlin. I hope this article has given you a good introduction to Kotlin and inspired you to explore more. Happy coding!