With Statement

the with statement evaluates an expression and makes the result available inside a block as the special name it.

it only exists inside the with statement block

with x {
    putln(it)
}

inside the block, it refers to the value of x.

it Is Read-Only

inside a with block, it behaves like a constant

with x {
    it = 10   // not allowed
}

you cannot reassign it

Nested with blocks create a new it, which shadows the outer one.

with a {
    with b {
        putln(it) // refers to b
    }
}

the inner it hides the outer it for the duration of the inner block

since with allows any expression, you can do some odd stuff like this

with sum(1, 3) {
    putln(it)
}

output:

instead of

x := sum(1, 3)
putln(x)

output: