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while and for loops
Conditionals and loops example from a Well House Consultants training course
More on Conditionals and loops [link]
Source code: lloops Module: U103
#!/usr/bin/env lua


A for loop lets you iterate from a start value to
an end vale with an optional step (first form) or
through a table (second form).


print ("\nwhile loop in lua")
while j < 20 do
        print (j)
        j = j + 1

print ("\ntwo parameter form of for - steps of 1")
for k = 1, 5 do
        print (k)

print ("\nthree parameter form of for - step size specified")
for k = 1, 5, 2 do
        print (k)

print ("\nthere is no one parameter form of for in lua")

print ("\nfor loop to parse a table with automatic keys")
days = {"Monday","Wednesday","Friday"}
-- ipairs is "INDEXED pairs"
for index,today in ipairs(days) do
        print (index, today)

print ("\nfor loop to parse a table with specified keys")
days = {Monday = "Chinese",Wednesday = "Pizza" ,
        Thursday = "The Pub", Tuesday = "Subway",
        Friday = "Fish and Chops"}
-- pairs returns key and value pairs
for index,today in pairs(days) do
        print (index, today)

--[[ -------------------- Sample Output

[trainee@easterton u103]$ lua lloops

while loop in lua

two parameter form of for - steps of 1

three parameter form of for - step size specified

there is no one parameter form of for in lua

for loop to parse a table with automatic keys
1 Monday
2 Wednesday
3 Friday

for loop to parse a table with specified keys
Tuesday Subway
Wednesday Pizza
Friday Fish and Chops
Thursday The Pub
Monday Chinese
[trainee@easterton u103]$


Learn about this subject
This module and example are covered on the following public courses:
 * Learning to program in Lua
 * Lua Programming
 * Lua Programming
Also available on on site courses for larger groups

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Other Examples
This example comes from our "Conditionals and loops" training module. You'll find a description of the topic and some other closely related examples on the "Conditionals and loops" module index page.

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