wscript: functions & control flow

Block-valued fn bodies, closures, if/for/while/loop; ranges are exclusive (0..10) or inclusive (0..=10).

rust

fn area(w: int, h: int) -> int { w * h }   // blocks evaluate to last expression
fn log_it(msg: string) { println(msg) }    // omitted return type = unit
let double = |x| x * 2                     // closures

if cond { } else { }
for i in 0..10 { }          // exclusive; 0..=10 inclusive
for x in [1, 2, 3] { }      // list elements (also map keys, string chars)
while cond { }
loop { if done { break } }

A function with no return type must not end on a non-unit expression — bind unused Results (let _ = vm.mouse_click("left")) or add ; to discard.