In Ruby, not is a logical operator that returns the opposite of a given Boolean expression.
Here's an example:
x = 10
y = 20
if not(x > y)
puts "x is not greater than y"
end
In this example, not(x > y) will return true since x is not greater than y. Therefore, the code inside the if statement will be executed and "x is not greater than y" will be printed to the console.
Alternatively, you can use ! as a shorthand for not, like so:
if !(x > y)
puts "x is not greater than y"
end
This achieves the same result as the first example.