while introduces a loop that will be executed until the condition provided evaluates to false. If you add the keyword do after the condition, then the block of code will execute at least once, regardless of whether the condition is met. exit exits prematurely from a loop whenever you need to, whereas jump jumps straight to the next iteration.
let i = 0;
while i < users.length {
//will print the value
//if the condition is true
std.printLn(users[i].name);
i++;
}
let i = 10;
while i < 10 do {
//will print the value
//at least once
std.printLn(i);
i++;
}