Statements & Expressions

Statement

• instructions that perform an action and do not return a value
• ends with semicolon ;
• examples:
  • creating a variable and value assignment let x = 6
  • function definition itself is a statement

fn main() {
    let y = 6;
}

Expression

• expressions evaluate to a resultant value
• expression can be part of a statement e.g. can be assigned as a value to a variable
• expression does not have a semicolon at the end of line
• examples:
  • number 6 in statement let x = 6 is an expression that evaluates to 6
  • calling function is an expression
  • if itself is an expression

fn main() {
    let y = {
        let x = 3;
        x + 1     // an expression
    };
}