Difference between revisions of "Basic lua: Operators"
From The Official Visionaire Studio: Adventure Game Engine Wiki
(→Logical Operators) |
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| not || Checks if condition equals false or negative. | | 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" | {| class="ts" | ||
Revision as of 15:49, 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 |
| Example 2: if condition is true (method 2) | |
|---|---|
local a = true
if a == true then
print("a = true")
end |
| Example 3: if condition is false | |
|---|---|
local a = false
if a == false then
print("a = false")
end |
| Example 4: if condition is not met, then do else | |
|---|---|
local a = false
if a then
print("a = true")
else
print("a = false")
end |
| 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 |
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 1: if condition a is true and condition b is false then | |
|---|---|
local a = true
local b = false
if a == true and b == false then
print("a = true", "b=false")
end |
| Example 2: if condition is true or condition == true then | |
|---|---|
local a = true
if a or a == true then
print("a = true")
end |
| Example 3: if condition is not true | |
|---|---|
local a = false
if not a then
print("a = false")
end |
