Difference between revisions of "Basic lua: Types"

From The Official Visionaire Studio: Adventure Game Engine Wiki
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{| class="in"
 
{| class="in"
 
|-
 
|-
−
| class="i_arrow clickablecell" |  [[basic_lua:_Operators|Operators<]]
+
| class="i_arrow clickablecell" |  [[basic_lua:_Operators|<]]
 
| class="i_norm clickablecell" | '''[[basic_lua:_Index|Index]]'''
 
| class="i_norm clickablecell" | '''[[basic_lua:_Index|Index]]'''
 
| class="i_arrow clickablecell" | [[basic_lua:_Variables|>]]
 
| class="i_arrow clickablecell" | [[basic_lua:_Variables|>]]
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end
 
end
 
</syntaxhighlight> || width="200px" | [[File:lb_operators_004.png|thumb|right|180px|click to enlarge]]
 
</syntaxhighlight> || width="200px" | [[File:lb_operators_004.png|thumb|right|180px|click to enlarge]]
−
|}
 
−
 
−
{| class="ts"
 
−
|-
 
−
! Example 4: if condition is not met, then do else !!
 
−
|-
 
−
| <syntaxhighlight>
 
−
local a = false
 
−
 
−
if a then
 
−
print("a = true")
 
−
else
 
−
print("a = false")
 
−
end
 
−
</syntaxhighlight> || width="200px" | [[File:lb_operators_005.png|thumb|right|180px|click to enlarge]]
 
−
|}
 
−
 
−
{| class="ts"
 
−
|-
 
−
! Example 5: if condition is not met, then do elseif !!
 
−
|-
 
−
| <syntaxhighlight>
 
−
local a = false
 
−
 
−
if a then
 
−
print("a = true")
 
−
elseif not a then
 
−
print("a = false")
 
−
end
 
−
</syntaxhighlight> || width="200px" | [[File:lb_operators_006.png|thumb|right|180px|click to enlarge]]
 
−
|}
 
−
 
−
== Logical Operators ==
 
−
{| class="ts"
 
−
|-
 
−
| and || width="90%" | Allows you to check multiple conditions in a single if query.
 
−
|-
 
−
| or || Allows you to add an alternative if query into a single if query.
 
−
|-
 
−
| not || Checks if condition equals false or negative.
 
−
|}
 
−
 
−
{| class="ts"
 
−
|-
 
−
! Example 1: if condition a is true and condition b is false then !!
 
−
|-
 
−
| <syntaxhighlight>
 
−
local a = true
 
−
local b = false
 
−
 
−
if a == true and b == false then
 
−
print("a = true", "b=false")
 
−
end
 
−
</syntaxhighlight> || width="200px" | [[File:lb_operators_007.png|thumb|right|180px|click to enlarge]]
 
−
|}
 
−
 
−
{| class="ts"
 
−
|-
 
−
! Example 2: if condition is true or condition == true then !!
 
−
|-
 
−
| <syntaxhighlight>
 
−
local a = true
 
−
 
−
if a or a == true then
 
−
print("a = true")
 
−
end
 
−
</syntaxhighlight> || width="200px" | [[File:lb_operators_008.png|thumb|right|180px|click to enlarge]]
 
−
|}
 
−
 
−
{| class="ts"
 
−
|-
 
−
! Example 3: if condition is not true !!
 
−
|-
 
−
| <syntaxhighlight>
 
−
local a = false
 
−
 
−
if not a then
 
−
print("a = false")
 
−
end
 
−
</syntaxhighlight> || width="200px" | [[File:lb_operators_003.png|thumb|right|180px|click to enlarge]]
 
−
|}
 
−
 
−
== Comparison Operators ==
 
−
{| class="ts"
 
−
|-
 
−
| <big>==</big> || width="90%" | Equal to.
 
−
|-
 
−
| <big>~=</big> || Does not equal.
 
−
|-
 
−
| <big>>=</big> || Greater than or equal to.
 
−
|-
 
−
| <big>></big> || Greater than.
 
−
|-
 
−
| <big><=</big> || Less than or equal to.
 
−
|-
 
−
| <big><</big> || Less than.
 
−
|}
 
−
 
−
{| class="ts"
 
−
|-
 
−
!  Example 1: if a equals 1 !!
 
−
|-
 
−
| <syntaxhighlight>
 
−
local a = 1
 
−
 
−
if a == 1 then
 
−
print("a = 1")
 
−
end
 
−
</syntaxhighlight> || width="200px" | [[File:lb_operators_009.png|thumb|right|180px|click to enlarge]]
 
−
|}
 
−
 
−
{| class="ts"
 
−
|-
 
−
! Example 2: if a does not equal 2 !!
 
−
|-
 
−
| <syntaxhighlight>
 
−
local a = 1
 
−
 
−
if a ~= 2 then
 
−
print("a = " .. a)
 
−
end
 
−
</syntaxhighlight> || width="200px" | [[File:lb_operators_010.png|thumb|right|180px|click to enlarge]]
 
−
|}
 
−
 
−
{| class="ts"
 
−
|-
 
−
! Example 3: if a is greater than or equal to 2 !!
 
−
|-
 
−
| <syntaxhighlight>
 
−
local a = 5
 
−
 
−
if a >= 2 then
 
−
print("a = " .. a)
 
−
end
 
−
</syntaxhighlight> || width="200px" | [[File:lb_operators_011.png|thumb|right|180px|click to enlarge]]
 
−
|}
 
−
 
−
{| class="ts"
 
−
|-
 
−
! Example 4: if a is greater than 2 !!
 
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|-
 
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| <syntaxhighlight>
 
−
local a = 3
 
−
 
−
if a > 2 then
 
−
print("a = " .. a)
 
−
end
 
−
</syntaxhighlight> || width="200px" | [[File:lb_operators_012.png|thumb|right|180px|click to enlarge]]
 
−
|}
 
−
 
−
{| class="ts"
 
−
|-
 
−
! Example 5: if a less than or equal to 2  !!
 
−
|-
 
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| <syntaxhighlight>
 
−
local a = 2
 
−
 
−
if a <=  2 then
 
−
print("a = " .. a)
 
−
end
 
−
</syntaxhighlight> || width="200px" | [[File:lb_operators_013.png|thumb|right|180px|click to enlarge]]
 
−
|}
 
−
 
−
{| class="ts"
 
−
|-
 
−
! Example 6: if a less than 2  !!
 
−
|-
 
−
| <syntaxhighlight>
 
−
local a = 0
 
−
 
−
if a <  2 then
 
−
print("a = " .. a)
 
−
end
 
−
</syntaxhighlight> || width="200px" | [[File:lb_operators_014.png|thumb|right|180px|click to enlarge]]
 
−
|}
 
−
 
−
== Mathematical Operators ==
 
−
{| class="ts"
 
−
|-
 
−
| <big>+</big> || width="90%" | Add
 
−
|-
 
−
| <big>-</big> || Subtract or invert
 
−
|-
 
−
| <big>*</big> || Multiply
 
−
|-
 
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| <big>/</big> || Divide
 
−
|-
 
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| <big>^</big> || Power
 
−
|-
 
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| <big>%</big> || Remainder
 
−
|}
 
−
 
−
{| class="ts"
 
−
|-
 
−
!  Example 1: 1 +2 = 3 !!
 
−
|-
 
−
| <syntaxhighlight>
 
−
local a = 1
 
−
local b = 2
 
−
local result = a + b
 
−
 
−
print( result )
 
−
</syntaxhighlight> || width="200px" | [[File:lb_operators_015.png|thumb|right|180px|click to enlarge]]
 
−
|}
 
−
 
−
{| class="ts"
 
−
|-
 
−
! Example 2: 3 - 2 = 1 !!
 
−
|-
 
−
| <syntaxhighlight>
 
−
local a = 3
 
−
local b = 2
 
−
local result = a - b
 
−
 
−
print( result )
 
−
</syntaxhighlight> || width="200px" | [[File:lb_operators_016.png|thumb|right|180px|click to enlarge]]
 
−
|}
 
−
 
−
{| class="ts"
 
−
|-
 
−
! Example 3: inversed values !!
 
−
|-
 
−
| <syntaxhighlight>
 
−
local a = 3
 
−
local result = -a
 
−
 
−
print( "original value: " .. a, "inversed value: " .. result )
 
−
</syntaxhighlight> || width="200px" | [[File:lb_operators_017.png|thumb|right|180px|click to enlarge]]
 
−
|}
 
−
 
−
{| class="ts"
 
−
|-
 
−
! Example 4: 2 x 2 = 4 !!
 
−
|-
 
−
| <syntaxhighlight>
 
−
local a = 2
 
−
local result = a * a
 
−
 
−
print( result )
 
−
</syntaxhighlight> || width="200px" | [[File:lb_operators_018.png|thumb|right|180px|click to enlarge]]
 
−
|}
 
−
 
−
{| class="ts"
 
−
|-
 
−
! Example 5: 10 ÷ 5 = 2  !!
 
−
|-
 
−
| <syntaxhighlight>
 
−
local a = 10
 
−
local b = 5
 
−
local result = a / b
 
−
 
−
print( result )
 
−
</syntaxhighlight> || width="200px" | [[File:lb_operators_019.png|thumb|right|180px|click to enlarge]]
 
−
|}
 
−
 
−
{| class="ts"
 
−
|-
 
−
! Example 6: base of 2, power of 8 (2ⁿ) = 256  !!
 
−
|-
 
−
| <syntaxhighlight>
 
−
local a = 2
 
−
local b = 8
 
−
local result = 2 ^ 8
 
−
 
−
-- break down power function into string result (ignore this code)
 
−
function power(i1, i2)
 
−
local val = ""
 
−
--+--
 
−
for i = 1, i2 do
 
−
  if i < i2 then val = val..i1.."*" else val = val..i1 end
 
−
end
 
−
return "which is the equivalent of " .. val
 
−
end
 
−
 
−
print("power value of 2 & 8 = " .. result, power(a,b))
 
−
</syntaxhighlight> || width="200px" | [[File:lb_operators_020.png|thumb|right|180px|click to enlarge]]
 
−
|}
 
−
 
−
{| class="ts"
 
−
|-
 
−
!  Example 7: remainder of 25 ÷ 4 = 1 !!
 
−
|-
 
−
| style="max-width: 700px;" | <syntaxhighlight>
 
−
local a = 25
 
−
local b = 4
 
−
local result = a / 4
 
−
local remainder = a % b
 
−
local decimal = remainder / b
 
−
 
−
print("result: 25 ÷ 4 = "  .. result, "remainder: .25 x 4 = " .. remainder, "decimal: 1 ÷ 4 = " .. decimal )
 
−
</syntaxhighlight> || width="200px" | [[File:lb_operators_021.png|thumb|right|180px|click to enlarge]]
 
 
|}
 
|}
  
 
{| class="in"
 
{| class="in"
 
|-
 
|-
−
| class="i_arrow clickablecell" |  [[basic_lua:_Operators|Operators<]]
+
| class="i_arrow clickablecell" |  [[basic_lua:_Operators|<]]
 
| class="i_norm clickablecell" | '''[[basic_lua:_Index|Index]]'''
 
| class="i_norm clickablecell" | '''[[basic_lua:_Index|Index]]'''
 
| class="i_arrow clickablecell" | [[basic_lua:_Variables|>]]
 
| class="i_arrow clickablecell" | [[basic_lua:_Variables|>]]
 
|}
 
|}
 
{{toc}}
 
{{toc}}

Revision as of 17:18, 25 August 2014

There are multiple lua types available, which are automatically determined by the returned value of the variable, function or table.

< Index >

Conditional Operators

boolean This returns a value of true or false.
function A function usually contains a list of actions to be executed & can often be used to calculate & return values.
nil If no data type is returned then whatever you queried is either empty or does not exist, thus it is nil.
number This usually contains an integer (whole) or floating point (decimal) number.
string This usually contains text or numbers wrapped in "quotation marks" or 'apostrophes'.
table This usually consists of an array, or multiple arrays of data & data types.
threads -
userdata -
Example 1: boolean 
local a = true
print( a, type(a) )
click to enlarge
Example 2: function 
function a(i)
 return i
end

print( a(7), type(a) )
click to enlarge
Example 3: if condition is false 
local a = false

if a == false then
 print("a = false")
end
click to enlarge
< Index >


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