Control Flow

XCX 2.2 Control Flow

Conditional Statements (if/elseif/else)

if (condition) then;
    --- block
elseif (other_condition) then;
    --- block
else;
    --- block
end;

Aliases:

All forms are equivalent and can be mixed:

i: score = 75;
if (score >= 90) then;
    >! "A";
elif (score >= 75) then;
    >! "B";
elf (score >= 60) then;
    >! "C";
els;
    >! "F";
end;

Loops

Range For

Range is inclusive on both sides.

for i in 1 to 3 do;
    >! i;
end;
--- prints: 1, 2, 3

Stepped For (@step)

for j in 0 to 6 @step 2 do;
    >! j;
end;
--- prints: 0, 2, 4, 6

Collection Iteration

Works on arrays, sets, and fibers. The loop variable receives the element, not the index.

--- Array
array:i: nums {10, 20, 30};
for el in nums do;
    >! el;
end;

--- Set
set:N: primes {2, 3, 5, 7, 11};
for p in primes do;
    >! p;
end;

--- Fiber
fiber:i: f = gen(5);
for val in f do;
    >! val;
end;

While Loop

i: cnt = 0;
while (cnt < 3) do;
    cnt = cnt + 1;
    >! cnt;
end;

Break and Continue

break exits the current loop. continue skips to the next iteration. Both affect only the immediately enclosing loop.

for n in 1 to 5 do;
    if (n % 2 == 0) then; continue; end;
    if (n == 5) then; break; end;
    >! n;
end;

[!NOTE] break inside a for loop over a fiber automatically calls .close() on that fiber.