Executing code if three conditions are false

I'm trying to skip over calculating some numbers when the result would be an attempt to insert NaN into the DB. My code is as follows:

unless @X = 0 || @Y = 0 || Z= 0 #Don't execute below code if any of the three values = 0
    #Do some stuff with @X, @Y and @Z
end

I know that X,Y and Z are positive integer开发者_如何学JAVAs, as they should be, however this statement is not triggering the code block in the unless clause. Am I blatantly misusing the || operator?

You're using = the assignment operator. You want to be using == the equality operator. Your code should look like this:

unless @X == 0 || @Y == 0 || @Z == 0
...
end

You should be using a double equals (==) for comparison in an if or unless clause, not a single equals (=).

Especially when you want to compare with zero, there is a built in command in ruby which is faster than doing == 0.

unless @x.zero? or @y.zero? or @z.zero?
  ...
end

You can use either || or or here.