Key Concepts

Review core concepts you need to learn to master this subject

The main() Function

Print Statements

Comments

Order of Execution

The main() Function

fun main() {
  // Code goes here
}

The main() function is the starting off point of every Kotlin program and must be included in the code before execution.

Introduction to Kotlin
Lesson 1 of 1
  1. 1
    What is Kotlin?
    Welcome to the world of coding with Kotlin! Kotlin is a programming language that, after its release in 2016 by JetBrains, quickly gained popularity amongst develope…
    Start
  2. 2
    First Kotlin Program
    What better way to start learning about Kotlin than to run a Kotlin program? Before we run our first program, let’s take a moment to understand our current environment. Code is written and edited …
    Start
  3. 3
    The main() Function
    Think of writing code like going on an adventure: we always need to start somewhere. In Kotlin, the journey begins in the main() function. The main() function is the “jumping off” point for our …
    Start
  4. 4
    Print Statements
    In the last exercise, we were able to display the text Coding is fun! in the output terminal with the following code: fun main() { println(“Coding is fun!”) } We accomplished this feat using a p…
    Start
  5. 5
    Order of Execution
    Similar to instructions in a recipe, code is read, compiled, and executed in a top-down order. When we run a program, a compiler translates our Kotlin co…
    Start
  6. 6
    Comments
    Documenting what our code is accomplishing is a good programming practice because it makes our code understandable for both the programmer and anyone else who reads it. Comments allow us to wri…
    Start
  7. 7
    Errors and Bugs
    While every programmer is different, there is one experience we all share: getting an error message. An error, or bug, causes our programs to behave in unexpected ways. When we receive an error me…
    Start
  8. 8
    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 convention…
    Start
  9. 9
    Review and Resources
    Great job completing the first lesson on learning Kotlin! Let’s go over all the content we have discussed: * Kotlin is a general-purpose programming language. * The main() function is the starting …
    Start

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