Control Flow

Branches

Use if, optional elif branches, and an optional else. Every body needs braces.

input endpoint: url
response = http.get(endpoint, timeout=3s)
if response.status == 200 {
    print("up")
} elif response.status >= 500 {
    print("server error")
} else {
    print("unexpected status")
}

Iteration

Use for to iterate over a list or set. Do not depend on iteration completion or output order.

for port in [80, 443, 8080] {
    print(port)
}

For explicit concurrent work, use parallel for. max is optional; when supplied, it limits concurrency alongside the run’s own limits.

input endpoints: list<url>
parallel(max=4) for endpoint in endpoints {
    response = http.get(endpoint, timeout=3s)
    out(response.status)
}

parallel for endpoint in endpoints { ... } is also valid. Keep iterations independent. break stops a loop and continue skips the rest of an iteration; both work in ordinary for, while, and repeat loops, but not in parallel for.

Repeating work

while checks its condition before each iteration. repeat runs the body before testing until; it requires max and accepts an optional every delay.

attempts = 0
repeat(max=3, every=1s) until attempts >= 2 {
    attempts = attempts + 1
    print(attempts)
}

Use a bound or a clear exit condition. Run limits can stop work even if your loop condition remains true.

List comprehensions

Build and optionally filter a list in one expression:

values = [1, 2, 3, 4]
evens = [n * 2 for n in values if n % 2 == 0]
out(evens)

Use try/catch inside a loop when one failed operation should not stop the remaining work.