Let expression

Let expressions allow define variables and one expression at the end with access to all the variables defined

let x = 10
    y = 20
then x + 10

you can nest many let expressions

let x = let x1 = 10
            x2 = 20
        then x1 + x2
    y = 30
then x + y

note

To know more about the expressions used in let check match assignment expressions