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+--- Thread: Checking if a variable is not nil and not zero in ruby (/Thread-Checking-if-a-variable-is-not-nil-and-not-zero-in-ruby)
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Checking if a variable is not nil and not zero in ruby - regardance959219 - 07-18-2023
I am using the following code to check if a variable is not nil and not zero
if(discount != nil && discount != 0)
...
end
Is there a better way to do this?
RE: Checking if a variable is not nil and not zero in ruby - clemmieipqdf - 07-18-2023
You could initialize discount to 0 as long as your code is guaranteed not to try and use it before it is initialized. That would remove one check I suppose, I can't think of anything else.
RE: Checking if a variable is not nil and not zero in ruby - plausibleness289598 - 07-18-2023
You could do this:
if (!discount.nil? && !discount.zero?)
The order is important here, because if `discount` is `nil`, then it will not have a `zero?` method. Ruby's short-circuit evaluation should prevent it from trying to evaluate `discount.zero?`, however, if `discount` is `nil`.
RE: Checking if a variable is not nil and not zero in ruby - Drlacker1 - 07-18-2023
<pre><code>
unless [nil, 0].include?(discount)
# ...
end
<code></pre>
RE: Checking if a variable is not nil and not zero in ruby - marcin - 07-18-2023
class Object
def nil_zero?
self.nil? || self == 0
end
end
# which lets you do
nil.nil_zero? # returns true
0.nil_zero? # returns true
1.nil_zero? # returns false
"a".nil_zero? # returns false
unless discount.nil_zero?
# do stuff...
end
Beware of the usual disclaimers... great power/responsibility, monkey patching leading to the dark side etc.
RE: Checking if a variable is not nil and not zero in ruby - strewage158668 - 07-18-2023
if (discount||0) != 0
#...
end
RE: Checking if a variable is not nil and not zero in ruby - raff210 - 07-18-2023
I believe the following is good enough for ruby code. I don't think I could write a unit test that shows any difference between this and the original.
if discount != 0
end
RE: Checking if a variable is not nil and not zero in ruby - flaunt80432 - 07-18-2023
if discount and discount != 0
..
end
update, it will `false` for `discount = false`
RE: Checking if a variable is not nil and not zero in ruby - vegetation177921 - 07-18-2023
<pre><code>
unless discount.nil? || discount == 0
# ...
end
<code></pre>
RE: Checking if a variable is not nil and not zero in ruby - orthosite900631 - 07-18-2023
You can convert your empty row to integer value and check zero?.
"".to_i.zero? => true
nil.to_i.zero? => true