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↑ Rust
Rust - Statements and Expressions
Rust is an expression based language.
- statements > perform action and do not return a value
- expressions > evaluate to a resultant value
for ex let y = 6; is a statement
since statement do not return values so you can't assign a let to another variable let x = (let y = 6); will give an error
in let y = 6;, 6 is an expression that evaluate to.... surprise, 6
Calling a function is an expression. Calling a macro is an expression. A new scope block created with curly brackets is an expression
fn main() {
let y = {
let x = 3;
// Note there is no semilicon here
x + 1
};
println!("The value of y is: {y}");
}
the expression that evaluate to 4:
{
let x = 3;
x + 1
}
x + 1 doesn't have a ; because it would turn it to a statement and not return a value