Ruby Variable name

Question

What happens when we write - before variable name

e.g. -var="Hello world"
puts var # Hello world
puts -var # -Hello world

What is actually happening here? How Ruby treat - sign

Answer 1

-var="Hello world" here - does not change anything
puts var # Hello world
puts -var # Hello world here - does not change anything

-var=5 here - does not change anything
puts var # 5
puts -var # -5 here -change the sign