Kotlin

Hello World in Kotlin

Every programming journey starts with Hello World. Let’s write our first Kotlin program.

The Code

Create a file named Hello.kt:

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fun main() {
    println("Hello, World!")
} …

Variables and Types in Kotlin

Kotlin’s type system is one of its defining features. It combines the safety of static typing with the convenience of type inference, so you rarely need to write explicit type annotations while …

The Billion-Dollar Mistake, 60 Years Later: How Languages Handle Null

In 2009, Tony Hoare stood at the QCon conference in London and confessed to a crime.

“I call it my billion-dollar mistake,” he said. “It was the invention of the null reference in …

def, func, fun, fn, sub: Why Every Language Has a Different Word for the Same Thing

Open almost any programming language reference and you will find, somewhere near the beginning, a section explaining how to define a reusable named block of code. The concept is universal. The word …

How 10 New Programming Languages Are Rewriting the Rules (And Why They Were Born)

Every programming language is, at its core, a written argument. An argument that the languages which came before failed at something important — something worth spending years of your life to fix. …