Difference between revisions of "Basic lua: Operators"

Revision as of 15:40, 20 August 2014

Lua operators are expressions used to perform calculations or to pass arguments between different value types.

Conditional Operators

if	Query if something does or does not meet a certain condition.
else	Do something else if the query condition was not met.
elseif	Used to add additional if queries, if the initial query condition was not met.
end	This is used to close various queries or functions; there must be the same amount of end as if; except in instances where elseif has been used.

Example 1: if condition is true (method 1)
local a = true if a then print("a = true") end	click to enlarge

Example 2: if condition is true (method 2)
local a = true if a == true then print("a = true") end	click to enlarge

Example 3: if condition is false
local a = false if a == false then print("a = false") end	click to enlarge

Example 4: if condition is not met, then do else
local a = false if a then print("a = true") else print("a = false") end	click to enlarge

Example 5: if condition is not met, then do elseif
local a = false if a then print("a = true") elseif not a then print("a = false") end	click to enlarge

Logical Operators

and	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.

Example 3: if condition is not true
local a = false if not a then print("a = false") end	click to enlarge

@@ Line 41: / Line 41: @@
 {| class="ts"
 |-
-! Example 3: if condition is false (method 1) !!
+! Example 3: if condition is false !!
 |-
 | <syntaxhighlight>
 local a = false
-if not a then
+if a == false then
   print("a = false")
 end
-</syntaxhighlight> || width="200px" | [[File:lb_operators_003.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 false (method 2) !!
+! Example 4: if condition is not met, then do else !!
 |-
 | <syntaxhighlight>
 local a = false
-if a == false then
+if a then
+ print("a = true")
+else
   print("a = false")
 end
-</syntaxhighlight> || width="200px" | [[File:lb_operators_004.png|thumb|right|180px|click to enlarge]]
+</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 else !!
+! Example 5: if condition is not met, then do elseif !!
 |-
 | <syntaxhighlight>
@@ Line 74: / Line 76: @@
 if a then
   print("a = true")
-else
+elseif not a then
   print("a = false")
 end
-</syntaxhighlight> || width="200px" | [[File:lb_operators_005.png|thumb|right|180px|click to enlarge]]
+</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 5: if condition is not met, then do elseif !!
+! Example 3: if condition is not true !!
 |-
 | <syntaxhighlight>
 local a = false
-if a then
+if not 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]]
+</syntaxhighlight> || width="200px" | [[File:lb_operators_003.png|thumb|right|180px|click to enlarge]]
 |}