Lua - for loop


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A for loop is a repetition control structure that allows you to efficiently write a loop that needs to execute a specific number of times.

Syntax

The syntax of a for loop in Lua programming language is as follows −

for init,max/min value, increment
do
   statement(s)
end

Here is the flow of control in a for loop −

  • The init step is executed first, and only once. This step allows you to declare and initialize any loop control variables.

  • Next, the max/min. This is the maximum or minimum value till which the loop continues to execute. It creates a condition check internally to compare between the initial value and maximum/minimum value.

  • After the body of the for loop executes, the flow of the control jumps back up to the increment/decrement statement. This statement allows you to update any loop control variables.

  • The condition is now evaluated again. If it is true, the loop executes and the process repeats itself (body of loop, then increment step, and then again condition). After the condition becomes false, the for loop terminates.

Flow Diagram

for loop in Lua

Example

for i=10,1,-1 
do 
   print(i) 
end

When the above code is built and executed, it produces the following result −

10
9
8
7
6
5
4
3
2
1

lua_loops.htm

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