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.
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| else |
Do something else if the query condition was not met.
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| elseif |
Used to add additional if queries, if the initial query condition was not met.
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| 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.
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| Example 1: if condition is true (method 1) |
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local a = true
if a then
print("a = true")
end |
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| Example 2: if condition is true (method 2) |
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local a = true
if a == true then
print("a = true")
end |
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| Example 3: if condition is false |
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local a = false
if a == false then
print("a = false")
end |
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| Example 4: if condition is not met, then do else |
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local a = false
if a then
print("a = true")
else
print("a = false")
end |
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| Example 5: if condition is not met, then do elseif |
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local a = false
if a then
print("a = true")
elseif not a then
print("a = false")
end |
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Logical Operators
| and |
Allows you to check multiple conditions in a single if query.
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| or |
Allows you to add an alternative if query into a single if query.
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| not |
Checks if condition equals false or negative.
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| Example 1: if condition a is true and condition b is false then |
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local a = true
local b = false
if a == true and b == false then
print("a = true", "b=false")
end |
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| Example 2: if condition is true or condition == true then |
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local a = true
if a or a == true then
print("a = true")
end |
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| Example 3: if condition is not true |
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local a = false
if not a then
print("a = false")
end |
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Comparison Operators
| == |
Equal to.
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| ~= |
Does not equal.
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| >= |
Greater than or equal to.
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| > |
Greater than.
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| <= |
Less than or equal to.
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| < |
Less than.
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| Example 1: if a equals 1 |
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local a = 1
if a == 1 then
print("a = 1")
end |
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| Example 2: if a does not equal 2 |
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local a = 1
if a ~= 2 then
print("a = " .. a)
end |
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| Example 3: if a is greater than or equal to 2 |
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local a = 5
if a >= 2 then
print("a = " .. a)
end |
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| Example 4: if a is greater than 2 |
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local a = 3
if a > 2 then
print("a = " .. a)
end |
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| Example 5: if a less than or equal to 2 |
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local a = 2
if a <= 2 then
print("a = " .. a)
end |
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| Example 6: if a less than 2 |
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local a = 0
if a < 2 then
print("a = " .. a)
end |
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Mathematical Operators
| + |
Add
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| - |
Subtract or invert
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| * |
Multiply
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| / |
Divide
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| ^ |
Power
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| % |
Remainder
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| Example 1: 1 +2 = 3 |
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local a = 1
local b = 2
local result = a + b
print( result ) |
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| Example 2: 3 - 2 = 1 |
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local a = 3
local b = 2
local result = a - b
print( result ) |
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| Example 3: inversed values |
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local a = 3
local result = -a
print( "original value: " .. a, "inversed value: " .. result ) |
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| Example 4: 2 x 2 = 4 |
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local a = 2
local result = a * a
print( result ) |
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| Example 5: 10 ÷ 5 = 2 |
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local a = 10
local b = 5
local result = a / b
print( result ) |
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| Example 6: base of 2, power of 8 (2ⁿ) = 256 |
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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)) |
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| Example 7: remainder of 25 ÷ 4 = 1 |
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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 )
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