The subtraction operator “-” can be used as a binary or unary operator.
As a binary operator, it subtracts the second argument from the first one.
As a unary operator, it returns the negation of the operand.
Any argument passed as a string is automatically converted into a number.
The following two expressions with a binary operator return the same result.
10 - 4 "10" - "4"
The following two expressions with a unary operator are return the same result.
- 4 - "4"
Contributors: Alberto Ferrari, Marco Russo, Kenneth Barber,