Chapter 3.2.1: Next and Leave

In the last chapter, we explored walk and while loops and how to create them. GLang gives you further control of these loops with the next and leave keywords.

next

If you want to skip to the next part of a loop (next iteration), you can use the next keyword anywhere in a walk or while loop.

# walk
walk i = 0 through 10 {
    if i == 5 {
        next;
    }

    bark(i); # outputs 0, 1, 2, 3, 4, 6, 7, 8, 9 (skipping 5)
}

# while
obj x = 0;

while x != 10 {
    if x == 4 {
        next;
    }

    x = x + 1; # x is incremented as 0, 1, 2, 3, 4, 6, 7, 8, 9, 10
}

leave

If you want to stop a loop, you can use the leave keyword anywhere in a walk or while loop.

# walk
walk i = 0 through 10 {
    if i == 5 {
        leave;
    }

    bark(i); # outputs 0, 1, 2, 3, 4 (stopping at 5)
}

# while
obj x = 0;

while x != 10 {
    if x == 4 {
        leave;
    }

    x = x + 1; # x is incremented as 0, 1, 2, 3, 4
}