Introduction to Kotlin
Formatting Conventions

In programming, formatting conventions are the suggested rules for how code should be structured in a specific programming language. By following Kotlin’s formatting standards, or coding conventions, we can drastically improve the readability of our programs.

Some of Kotlin’s formatting conventions include:


Code within curly braces should be indented 4 spaces. While the Codecademy code editor generally uses 2 spaces, or 1 tab, for indentation, be sure to use 4 spaces when writing Kotlin code off-platform.

fun main() { // Code starts here }

If we didn’t include indentation in our program, our code would still run without error; however, our code would look like a giant block of text making it hard to read. As programs get larger and more complicated, indentation for the purpose of organization becomes more essential.


When writing a comment, add a space (" ") between // and the start of the comment:

// Write your comment here

Curly Brackets:

When creating the main() function, place the opening curly bracket { on the same line as the main() function construct (in this case: fun main()). The closing bracket } should be placed on its own separate line and should be vertically aligned with the fun keyword:

fun main() { // Code goes here }

Keep the above conventions in mind when writing Kotlin code throughout this course and off-platform. We’ll encounter more formatting conventions as we progress through this course. To learn more, check out the coding conventions in Kotlin’s Language Guide.


Take a look at the code in Syntax.kt.

It’s unformatted but produces no error. Take some time to format the code using different coding conventions.

Click Next when you’re ready to move on.

Folder Icon

Take this course for free

Already have an account?