> Does the order of defining arguments matters or its just a taste of matter?

It's only a matter of taste or convenience. Haskell is a curried language, so you put the callback first to help partial application, and reversing the order is just a `flip` away.

Rust is uncurried and uses a C-style syntax, so you generally put lambdas in tail position, for a more block-y usage:

    foo.bar(x, |y| {
        // body
    });