Rust/Expression

• via Functions - The Rust Programming Language

  • Expressions evaluate to a value ... Consider a math operation, such as 5 + 6, which is an expression that evaluates to the value 11. Expressions can be part of statements: ... the 6 in the Rust/Statement let y = 6; is an expression that evaluates to the value 6. Calling a Rust/Function is an expression. Calling a Rust/Macro is an expression. A new scope block created with curly brackets is an expression, for example:
    

    • rust

      fn main() {
          let y = {
              let x = 3;
              x + 1
          };
      
          println!("The value of y is: {y}");
      }

    • the expression
      • rust

        {
            let x = 3;
            x + 1
        }

      • doesn't have semicolon; it just returns 4.