Chapter 5: Control Flow

  -- for: iterate a collection
for item in items {
    process(item);
}

-- for with index
for item, i in items {
    debug.print("[{}] {}\n", .{i, item});
}

-- for over a range
for i in 0..10 {          -- exclusive: 0, 1, ..., 9
    debug.print("{}\n", .{i});
}

for i in 0..=10 {         -- inclusive: 0, 1, ..., 10
    debug.print("{}\n", .{i});
}

-- while: condition-based
var n: i32 = 1;
while n < 100 {
    n *= 2;
}

-- loop: infinite, exit with break
var count: i32 = 0;
loop {
    count += 1;
    if count = 10 { break; }
}

-- loop with a value
var found = loop {
    var candidate = try nextCandidate();
    if candidate.valid { break candidate; }
};

-- repeat...until: post-condition (runs at least once)
var input: []const u8 = "";
repeat {
    input = try readLine();
} until input != "";
  

  for x, y in xs, ys {
    debug.print("{} {}\n", .{x, y});
}

-- with shared index
for x, y, i in xs, ys {
    debug.print("[{}] {} {}\n", .{i, x, y});
}
  

  outer: for i in 0..10 {
    for j in 0..10 {
        if i + j = 15 { break outer; }
    }
}

for item in items {
    if item.* = 0 { continue; }
    process(item);
}