In Lua, the and and or keywords provide logical operators for combining and applying conditional expressions. Here is how to use and/or in Lua with examples:
1. and operator:
The and operator returns the first operand if it is false or nil, otherwise, it returns the second operand. Here is an example:
local a = nil
local b = "hello"
local c = a and b
print(c) -- nil
local d = false
local e = "world"
local f = d and e
print(f) -- false
In the first example, since
a is nil, the and operator returns nil and assigns it to c. In the second example, since d is false, the and operator returns false and assigns it to f.
2. or operator:
The or operator returns the first operand if it is not false or nil, otherwise, it returns the second operand. Here is an example:
local a = nil
local b = "hello"
local c = a or b
print(c) -- hello
local d = false
local e = "world"
local f = d or e
print(f) -- world
In the first example, since
a is nil, the or operator returns b and assigns it to c. In the second example, since d is false, the or operator returns e and assigns it to f.