break and continue

break exits the nearest enclosing loop; continue skips to the next iteration.

let f() = do
    let x = 10
    let i = 0
    while (i < 100) do
        i = i + 1
        if (i > (x * 2)) break
        if (i > x) continue
        term.log(i)

    term.log(i, x)

let g() = f()

g()

(from loop_continue_and_break_test.ar)

This example logs 1 through 10 (stopping the term.log(i) calls once i > x, via continue), then keeps looping silently until i exceeds x * 2, at which point break exits the loop entirely and the final term.log(i, x) runs — printing 21 10.

Both keywords work inside for loops too, in exactly the same way.

Next