Lua goto Statement

The goto statement in the Lua language allows the control flow to be unconditionally transferred to a labeled statement.

The syntax format is as follows:

goto Label

The format of a Label is:

:: Label ::

The following example uses goto in a conditional statement:

Example 1

local a = 1
::label:: print("--- goto label ---")

a = a+1
if a < 3 then
goto label -- jump to label label when a is less than 3
end

The output result is:

--- goto label ---
--- goto label ---

As can be seen from the output result, it printed one extra time.--- goto label ---。

The following example demonstrates that multiple statements can be set in a label:

i = 0
::s1:: do
print(i)
i = i+1
end
if i>3 then
os.exit() --i is greater than3exit when
end
goto s1

The output result is:

With goto, we can implement the functionality of continue:

for i=1, 3 do
if i <= 2 then
print(i, "yes continue")
goto continue
end
print(i, " no continue")
::continue::
print([[i'm end]])
end

The output result is:

1   yes continue
i'm end
2   yes continue
i'm end
3    no continue
i'm end

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