4.12. Lua goto statement

In Lua language goto statement allows the control flow to be transferred unconditionally to the marked statement.

4.12.1. Grammar #

The syntax format is as follows:

goto Label

The Label format is:

:: Label :: 

The following example is used in a judgment statement goto :

local a = 1 ::label:: print("--- goto label ---") a = a+1 if a < 3 then goto label -- Jump to label when a is less than 3 end 

The output is as follows:

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

As can be seen from the output, there is one more output --- goto label --- .

The following example demonstrates the ability to set multiple statements in a lable :

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

The output is as follows:

0 1 2 3 

With goto , we can implement the function 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 is as follows:

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