allowing statements to be used as expressions

Rust allows most statements to be used as expressions.

let x = if isTrue {
  println!("hi");
  3
} else {
  4
}

Swift allows statements to be used as expressions if they only contain a single expression in their bodies.

var isEnabled = switch {
case .enabled: true
default: false
}

In Haskell and many functional programming languages all control flow statements are expressions.

Generalization of if expressions.