Progam Structure

For some of you older .NET developers, you might remember the days when a .NET application had a Program.cs file and a static void Main() method that looked a little bit something like this:

static void Main(object[] args){
    Console.WriteLine("Hello, World!");    
}

And then Microsoft went and made things all simpler, which means a .NET application still has a Program.cs file, now it looks a little bit something like this:

// See https://aka.ms/new-console-template for more information
Console.WriteLine("Hello, World!");

Now if you squint and look at this piece of code, go on. Really squint. I'm sure you can see the similarities with Rust:

fn main() {
    println!("Hello, world!");
}

important

The entrypoint to all Rust programs is main(). It takes no arguments, and returns no value.

Yep, you've got a function (in Rust world, you call them functions not methods) called main. And then you're printing a line (println!) to the console. Code blocks, or scopes, are wrapped in curly braces: {}.

Pretty similar to .NET right?

Run Your Application

What's that, you want to run your application now? Cool, cool. In .NET land, that would look a little bit something like this wouldn't it:

dotnet run

I bet you can't guess the Rust CLI command:

cargo run