Crystal

Hello World in Crystal

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

The Code

Create a file named hello.cr:

1
puts "Hello, World!"

That’s it! If you know …

Variables and Types in Crystal

March 14, 2026 crystal variables types data-types

Crystal’s type system is one of its most distinctive features: statically typed for safety and performance, yet rarely requiring explicit type annotations. The compiler infers types through …