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while

You can make code loop by using while condition do ... end - the test is done at the start of the loop, so if the test fails the loop may not be executed at all.

while danger_threatens () do
  flash_lights ()
end  -- while


If you want to leave the loop from inside you can use a break statement:

while danger_threatens () do
  flash_lights ()
  if enough_flashing () then
    break
  end -- if
end  -- while


The only conditions that are false are the values false and nil - every other value is considered true.

If you want to test at the end of the loop use repeat instead.


See Also ...

Lua keywords/topics

assignment
break
comments
data types
do
for (generic)
for (numeric)
function
identifiers
if / then / else
keywords
local
logical operators
precedence
relational operators
repeat
return
string literals
tables

Topics

Lua base functions
Lua bc (big number) functions
Lua bit manipulation functions
Lua coroutine functions
Lua debug functions
Lua io functions
Lua LPEG library
Lua math functions
Lua os functions
Lua package functions
Lua PCRE regular expression functions
Lua script extensions
Lua SQLite (database) interface
Lua string functions
Lua syntax
Lua table functions
Lua utilities
Scripting
Scripting callbacks - plugins

(Help topic: lua=while)

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Written by Nick Gammon - 5K   profile for Nick Gammon on Stack Exchange, a network of free, community-driven Q&A sites   Marriage equality

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