Difference between revisions of "Basic lua: Tables"
From The Official Visionaire Studio: Adventure Game Engine Wiki
| Line 72: | Line 72: | ||
print("\n...but as you can see it does not necessarily return them in the order they were created") | print("\n...but as you can see it does not necessarily return them in the order they were created") | ||
</syntaxhighlight> || width="180px" style="vertical-align:middle;" | [[File:Basic_lua_(tables)_3.png|frameless|center|180px]] | </syntaxhighlight> || width="180px" style="vertical-align:middle;" | [[File:Basic_lua_(tables)_3.png|frameless|center|180px]] | ||
| + | |} | ||
| + | |||
| + | {| class="ts" | ||
| + | |- | ||
| + | ! method 4: auto generated index entries with sub-arrays containing keywords !! | ||
| + | |- | ||
| + | | style="max-width:680px;" | <syntaxhighlight lang="lua"> | ||
| + | local t = { | ||
| + | |||
| + | {x = 100, y = 300}, | ||
| + | {x = 200, y = 111} | ||
| + | |||
| + | } | ||
| + | |||
| + | print("x = " .. t[1].x .. ", y = " .. t[1].y) | ||
| + | </syntaxhighlight> || width="180px" style="vertical-align:middle;" | [[File:Basic_lua_(tables)_4.png|frameless|center|180px]] | ||
| + | |} | ||
| + | |||
| + | |||
| + | {| class="ts" | ||
| + | |- | ||
| + | ! method 5: keyword tables with sub-arrays containing keywords containing even more keywords !! | ||
| + | |- | ||
| + | | style="max-width:680px;" | <syntaxhighlight lang="lua"> | ||
| + | local t_texts = { | ||
| + | |||
| + | ["English"] = { | ||
| + | {txt = "hello world!"}, | ||
| + | {txt = "goodbye world!"} | ||
| + | }, | ||
| + | |||
| + | ["German"] = { | ||
| + | {txt = "hallo welt!"}, | ||
| + | {txt = "auf wiedersehen welt"} | ||
| + | } | ||
| + | |||
| + | } | ||
| + | |||
| + | print( t_texts["English"][1].txt ) | ||
| + | </syntaxhighlight> || width="180px" style="vertical-align:middle;" | [[File:Basic_lua_(tables)_5.png|frameless|center|180px]] | ||
|} | |} | ||
Revision as of 21:13, 2 September 2022
Tables are one of the features of Lua script, that make the scripting language so dynamic & easy to use, as they allow us to easily create tables, insert, remove & sort data. Tables are often comprised of arrays that usually involve keywords - or an index number - & a value. Tables can be accessed using multiple different methods.
| < | Index | > |
Creating a table
| method 1: automatically generated index values | |
|---|---|
local t = {1, 2, 3, 4, 5, "six", 7, "ate", 9} -- automatically assigns an index number to each value starting from 1
local str = "" -- empty string
for i = 1, #t do -- for 1 to table total, print value of index number
str = str .. t[i] -- add current table index value to existing text data in the str variable
if i < #t then str = str .. ", " end -- if i is less than table entry total then insert ", " into the str variable
end
print("table data: " .. str) -- print the table data
print( "table entry total: " .. #(t) ) -- print total of table entries
|
_1.png) |
| method 2: manually created index values | |
|---|---|
local t = {
[1] = 1,
[2] = "two",
[3] = 3,
[4] = 2 * 2,
[5] = "five",
}
local str = "" -- empty string
for i = 1, #t do -- for 1 to table total, print value of index number
str = str .. t[i] -- add current table index value to existing text data in the str variable
if i < #t then str = str .. ", " end -- if i is less than table entry total then insert ", " into the str variable
end
print("table data: " .. str) -- print the table data
print( "table entry total: " .. #(t) ) -- print total of table entries
|
_2.png) |
| method 3: keywords & values | |
|---|---|
local t = {
["hello world"] = "hello world",
example = "this also works",
camelCaseExample = "this will also work",
snake_case_example = "as will this"
}
for k, v in pairs(t) do
print(k ..": " .. v)
end
print("\n...but as you can see it does not necessarily return them in the order they were created")
|
_3.png) |
| method 4: auto generated index entries with sub-arrays containing keywords | |
|---|---|
local t = {
{x = 100, y = 300},
{x = 200, y = 111}
}
print("x = " .. t[1].x .. ", y = " .. t[1].y)
|
_4.png) |
| method 5: keyword tables with sub-arrays containing keywords containing even more keywords | |
|---|---|
local t_texts = {
["English"] = {
{txt = "hello world!"},
{txt = "goodbye world!"}
},
["German"] = {
{txt = "hallo welt!"},
{txt = "auf wiedersehen welt"}
}
}
print( t_texts["English"][1].txt )
|
_5.png) |
| < | Index | > |
