Endless Tutorial - Lua - Arrays (array)

An array is an ordered arrangement of objects, which can be a one-dimensional array containing a collection of rows, or a multidimensional array containing multiple rows and columns.

In Lua, arrays are implemented using indexed tables with integers. The size of the array is not fixed and can grow as required by the tutorial (depending on memory constraints).

one-dimensional array

One-dimensional arrays can be represented using a simple table structure, and can be initialized and read using a simple for loop. One is shown below.

array = {
   
   "Lua", "Tutorial"}

for i = 0, 2 do
   print(array[i])
end

When the above code is run, the following output will be obtained.

nil
Lua
Tutorial

As you can see in the code above, when trying to access an element at an index that doesn't exist in the array, it returns nil. In Lua, indexing usually starts at index 1. But objects can also be created at index 0 and below. An array using negative indices is shown below, where a for loop is used to initialize the array.

array = {}

for i= -2, 2 do
   array[i] = i *2
end

for i = -2,2 do
   print(array[i])
end

When the above code is run, the following output will be obtained.

-4
-2
0
2
4

Multidimensional Arrays

The following shows an example of a multidimensional array of 3.3 using an array of arrays.

-- Initializing the array
array = {}

for i=1,3 do
   array[i] = {}
	
   for j=1,3 do
      array[i][j] = i*j
   end
	
end

-- Accessing the array

for i=1,3 do

   for j=1,3 do
      print(array[i][j])
   end
	
end

When the above code is run, the following output will be obtained.

1
2
3
2
4
6
3
6
9

An example of a multidimensional array using manipulated indices is shown below.

-- Initializing the array

array = {}

maxRows = 3
maxColumns = 3

for row=1,maxRows do

   for col=1,maxColumns do
      array[row*maxColumns +col] = row*col
   end
	
end

-- Accessing the array

for row=1,maxRows do

   for col=1,maxColumns do
      print(array[row*maxColumns +col])
   end
	
end

When Wu Ya Tutorial runs the above code, the following output will be obtained.

1
2
3
2
4
6
3
6
9

Lua - Arrays(Array) - Wuya Tutorial Network Wuya Tutorial Network provides an array is an ordered arrangement of objects, which can be a one-dimensional array containing a collection of rows, or a multidimensional number containing multiple rows and columns... https ://www.learnfk.com/lua/lua-arrays.html