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How to use logical operators in Lua

Dario Vincenzo Tarantini

In Lua, we have and, or, and not as logical operators. These operators can be used to evaluate the expression.

In Lua, everything that is not nil or false is handled as true in logical expressions.

The and operator

The and operator is used as a binary and returns the first operand if it’s false. Otherwise, it will return the second.

Example

print('a string' and false)
print('a string' and true)
print(true and 12)
Examples of "and" operator

Expected output

false
true
12

The or operator

The or operator returns the first operand if it’s true. Otherwise, it returns the second.

Example

print("a" or false)
print(true or 1)
Examples of "or" operator

Expected output

a
true

The not operator

The not operator is a unary operator and will return true if the operand is nil or false. Otherwise, it will return true.

Example

print(not false)
print(not true)
print(not 11)
Examples of "not" operator

Expected output

true
false
false

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lua
communitycreator

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Dario Vincenzo Tarantini
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