Lua Language - Revision history

Leunsel: /* Tables */

2026-06-25T20:29:21Z

‎Tables

Leunsel: /* Functions */

2026-06-25T20:28:49Z

‎Functions

Leunsel: /* Flow control */

2026-06-25T20:28:04Z

‎Flow control

Leunsel: /* Console output */

2026-06-25T20:27:08Z

‎Console output

Leunsel: /* Variables, types and operators */

2026-06-25T20:26:55Z

‎Variables, types and operators

Leunsel: /* Comments */

2026-06-25T20:26:35Z

‎Comments

Archiver.of.triviality: Undo revision 7602 by Archiver.of.triviality (talk)

2025-05-11T14:56:41Z

Undo revision 7602 by Archiver.of.triviality (talk)

Archiver.of.triviality: /* Syntax */

2025-05-11T14:55:42Z

‎Syntax

Paper: /* Tables */ typo

2024-06-01T17:30:08Z

‎Tables: typo

Paper: /* Functions */ typo

2024-06-01T17:05:15Z

‎Functions: typo

@@ Line 273: / Line 273: @@
 '''Examples''':
-<pre>
+<syntaxhighlight lang="lua" line>
 -- Creates an empty table
 Tab0 = {}
@@ Line 323: / Line 323: @@
 print(Tab2D[1][1],Tab2D[2][2],#Tab2D,#Tab2D[3],#Tab2D[4])
 -- prints '9 5 3 3' (lenght of Tab2D is 3 and lenght of Tab2D[3] is 3 too)
-</pre>
+</syntaxhighlight>
 '''Table functions:'''
@@ Line 333: / Line 333: @@
 '''Examples''':
-<pre>
+<syntaxhighlight lang="lua" line>
 numbs = {'One','Two','Three','Four'}
 print(table.concat(numbs,' ')) -- 'One Two Three Four'
@@ Line 342: / Line 342: @@
 table.remove(numbs,3)
 print(table.concat(numbs,' ')) -- 'Five Four Three Two'
-</pre>
+</syntaxhighlight>
 == External links ==

@@ Line 191: / Line 191: @@
 Functions are just some special variables, and can be declared at the global level or inside a block or another function.
-<pre>
+<syntaxhighlight lang="lua" line>
 -- first syntax version
 function MyFunction(arg1, arg2, ...)   -- takes 0, 1 to several arguments or undefined number of arguments
@@ Line 203: / Line 203: @@
    return result1, result2              -- returns 0, 1 to several variables
 end
-</pre>
+</syntaxhighlight>
 Any of preceding 2 declaration versions creates a function variable named <code>MyFunction</code>. Then the user can call it, use it or assign it a new value.
 '''Examples''':
-<pre>
+<syntaxhighlight lang="lua" line>
 MyFunction(MyVar4, MyVar2, MyVar7)   -- calling MyFunction with 3 arguments
 MyVar1 = MyFunction(MyVar2, MyVar7)  -- calling MyFunction with 2 arguments and keep the first result in MyVar1
@@ Line 214: / Line 214: @@
 MyFunction = nil                     -- MyFunction will be unavailable now (but print still keeps original MyFunction)
 MyFunction = MyVar7                  -- now MyFunction is an alias of the original print function
-</pre>
+</syntaxhighlight>
 Any type of arguments or return values are copied ''by value'' '''except for table arguments''' copied ''by reference''.
@@ Line 220: / Line 220: @@
 '''Examples''':
-<pre>
+<syntaxhighlight lang="lua" line>
 Func1=function(Tab, Idx)
    if(Idx==nil) then Idx=1 end        -- giving a default value 1
@@ Line 257: / Line 257: @@
 Show3(MyTab1)                        -- prints on 3 lines '-100' '-100' '30'
 Show4(MyTab1)                        -- prints on 3 lines '-100' '-100' '30'
-</pre>
+</syntaxhighlight>
 ==Tables==

@@ Line 108: / Line 108: @@
 Lua provides a conditional test with multiple, optional branches:
-<pre>
+<syntaxhighlight lang="lua" line>
 if BooleanExpression then
    -- if statement(s) body
@@ Line 116: / Line 116: @@
    -- else/default statement(s) body
 end
-</pre>
+</syntaxhighlight>
 and several conditional loops:
-<pre>
+<syntaxhighlight lang="lua" line>
 while BooleanExpression do    -- do statements while BooleanExpression is true
    --statements
@@ Line 136: / Line 136: @@
    --statements                -- KeyIdx and Val available inside the for loop
 end
-</pre>
+</syntaxhighlight>
 Lua has a special unconditional block mainly used to isolate some local variables:
-<pre>
+<syntaxhighlight lang="lua" line>
 do
    --statements
 end
-</pre>
+</syntaxhighlight>
 The <code>break</code> instruction breaks any type of loop and jump to the next instruction after the loop.
@@ Line 149: / Line 149: @@
 '''Examples''':
-<pre>
+<syntaxhighlight lang="lua" line>
 i=5
 while i<80 do                 -- it loops for i equal to 5, 10, 20, and 40
@@ Line 185: / Line 185: @@
 end
 print(MyVar)                  -- prints nothing but a new line
-</pre>
+</syntaxhighlight>
 ==Functions==

@@ Line 94: / Line 94: @@
 '''Examples:'''
-<pre>
+<syntaxhighlight lang="lua" line>
 print(MyVar1)                            -- prints an empty line because MyVal1 is nil
 print('MyVar3=',MyVar3,MyVar3,MyVar3)    -- prints the line 'MyVar3=2 2 2'
@@ Line 102: / Line 102: @@
 MyVar7("9.9+0.1=",9.9+0.1)               -- prints the line '9.9+0.1=10.0' (because MyVar7 is now equal to print)
 MyVar7('1/0=',1/0)                       -- prints the line '1/0=inf'
-</pre>
+</syntaxhighlight>
 ==Flow control==

@@ Line 61: / Line 61: @@
 '''Examples:'''
-<pre>
+<syntaxhighlight lang="lua" line>
 local MyVar0           -- local variable having nothing inside so equal to nil
 MyVar1 = nil           -- global variable MyVar1 having nothing inside (no type neither)
@@ Line 73: / Line 73: @@
 MyVar7 = print         -- global function variable MyVar7 which can be used as an alias of print function
 MyVar2, MyVar3 = MyVar3, MyVar2 -- parallel assignment: MyVar2 becomes 18 and MyVar3 becomes true
-</pre>
+</syntaxhighlight>
 '''Automatic typecast (coercion):'''

@@ Line 19: / Line 19: @@
 Multi-line comments begin with <code><nowiki>--[[</nowiki></code> and end with <code><nowiki>]]</nowiki></code> .
-<pre>
+<syntaxhighlight lang="lua" line>
 -- This is a simple comment just to the end of this line
 This is not a comment but a future syntax error -- This is a new simple comment
@@ Line 25: / Line 25: @@
 Second line of a multi-line comment
 Last line of a multi-line comment]]
-</pre>
+</syntaxhighlight>
 ==Variables, types and operators==

@@ Line 12: / Line 12: @@
 CE Lua interpreter respects traditional LUA syntax and provides some extra features.
-The Lua Script Editor provide a real-time colored syntax and a Syntax Check feature ('''Ctrl+Alt+L''').
+The Lua Script Editor provide a real-time colored syntax and a Syntax Check feature ('''Ctrl+Alt+C''').
 ==Comments==

@@ Line 277: / Line 277: @@
 Tab0 = {}
--- Creates an homogenous table of 3 pairs (number key/index, number value): (1,5), (2,10), and (3,20)
+-- Creates a homogenous table of 3 pairs (number key/index, number value): (1,5), (2,10), and (3,20)
 Tab1 = {5, 10, 20}
--- Creates an heterogeneous table of 3 pairs: (number 1,number 0), (number 2,string "second"), (number 3,function print)
+-- Creates a heterogeneous table of 3 pairs: (number 1,number 0), (number 2,string "second"), (number 3,function print)
 Tab2 = {0, "hours", print}
--- creates an heterogeneous table Tab3 of 3 pairs: (string 'no_space',number 8), (string 'string with spaces',boolean true), (number 12,table Tab2)
+-- creates a heterogeneous table Tab3 of 3 pairs: (string 'no_space',number 8), (string 'string with spaces',boolean true), (number 12,table Tab2)
--- Warning: the value of the 3th element is not a new copy of Tab2 but really Tab2 (Lua uses copy by reference for tables!)
+-- Warning: the value of the 3rd element is not a new copy of Tab2 but really Tab2 (Lua uses copy by reference for tables!)
 Tab3 = {no_space = 8, ['string with spaces'] = true, [12] = Tab2}

@@ Line 250: / Line 250: @@
 local MyIdx = 2
 Show(MyTab1)                         -- prints '10 20 30'
-Func1(MyTab1,MyIdx)                  -- change value of 2nd element of MyTab1 but no the value of MyIdx
+Func1(MyTab1,MyIdx)                  -- change value of 2nd element of MyTab1 but not the value of MyIdx
 Show(MyTab1)                         -- prints '20 -100 30'
-Func1(MyTab1)                        -- change value of 1st element of MyTab1 but no the value of MyIdx
+Func1(MyTab1)                        -- change value of 1st element of MyTab1 but not the value of MyIdx
 Show(MyTab1)                         -- prints '-100 -100 30'
 Show2(MyTab1)                        -- prints on 3 lines '-100' '-100' '30'