Add

What is the result of this code in Perl / Python / JavaScript / Rust?

fn main() {
    println!("ok");
    println!("{}", "19" + 23);
}

print("ok")
print("19" + 23)

{% embed include file="src/examples/python-types-at-pyweb-2025-05/add.js)

use feature 'say';

say "ok";
say "19" + 23;

rustc add.rs

• The Rust code will have a compilation error.

• The Python code will have a runtime exception.

• The Perl code will print the correct answer: 42.

However, in these example the problem is in-front of us. We can easily see it.