Numeric for Loop
Iterate over numeric ranges with the for i=start,limit,step syntax.
Numeric for Syntax
Lua's numeric for loop has the form for var = start, limit, step do. The step defaults to 1 if omitted. The loop variable is local to the loop body and cannot be modified inside. The limit and step are evaluated once before the loop starts.
-- Count 1 to 5
for i = 1, 5 do
io.write(i .. " ")
end
print() -- 1 2 3 4 5
-- Count with step 2
for i = 1, 10, 2 do
io.write(i .. " ")
end
print() -- 1 3 5 7 9Countdown with Negative Step
Use a negative step to count downward. The loop continues as long as var >= limit (when step is negative). If the start is already less than the limit with a negative step, the loop body never executes.
for i = 10, 1, -1 do
io.write(i .. " ")
end
print()
-- 10 9 8 7 6 5 4 3 2 1
-- Step -2
for i = 10, 0, -2 do
io.write(i .. " ")
end
print()
-- 10 8 6 4 2 0