Is there an easy way to parse a string to an integer that will throw an error of some sort if the string is not actually a properly formatted integer? "to_i" of course is very non-strict, which is no good for what I want, and I'd prefer not to write my own when it seems likely that there would be some way to do this already...
Thanks,
Ken
ArgumentError: invalid value for Integer: "junk"
from (irb):1:in `Integer'
from (irb):1
Hope that helps.
James Edward Gray II
On Aug 25, 2007, at 10:19 PM, Kenneth McDonald wrote:
Is there an easy way to parse a string to an integer that will throw an error of some sort if the string is not actually a properly formatted integer? "to_i" of course is very non-strict, which is no good for what I want, and I'd prefer not to write my own when it seems likely that there would be some way to do this already...
>> Integer("junk")
The real problem is:
irb(main):002:0> "12,345".to_i
=> 12
Basically, Ruby converts anything that starts with an int, which is really quite nasty in a case such as the above. I spent a lot of time tracking down that problem.
So, I want an integer conversion function that throws an error if the _entire_ string can't be interpreted as an integer; the Ruby analog to the standard string-to-int conversion function in most other languages.
Thanks,
Ken
James Edward Gray II wrote:
On Aug 25, 2007, at 10:19 PM, Kenneth McDonald wrote:
Is there an easy way to parse a string to an integer that will throw an error of some sort if the string is not actually a properly formatted integer? "to_i" of course is very non-strict, which is no good for what I want, and I'd prefer not to write my own when it seems likely that there would be some way to do this already...
>> Integer("junk")
ArgumentError: invalid value for Integer: "junk"
from (irb):1:in `Integer'
from (irb):1Hope that helps.
James Edward Gray II
raise "Bad integer" unless i_str =~ /\A-?\d+\z/
James Edward Gray II
On Aug 26, 2007, at 3:26 PM, Kenneth McDonald wrote:
The real problem is:
irb(main):002:0> "12,345".to_i
=> 12Basically, Ruby converts anything that starts with an int, which is really quite nasty in a case such as the above. I spent a lot of time tracking down that problem.
So, I want an integer conversion function that throws an error if the _entire_ string can't be interpreted as an integer; the Ruby analog to the standard string-to-int conversion function in most other languages.
Kenneth McDonald wrote:
James Edward Gray II wrote:
> >> Integer("junk")
>
> ArgumentError: invalid value for Integer: "junk"
So, I want an integer conversion function that throws an error if the
_entire_ string can't be interpreted as an integer; the Ruby analog to
the standard string-to-int conversion function in most other languages.
Ehrm,
Integer("12,345")
ArgumentError: invalid value for Integer: "12,345"
That's exactly what you wanted, right? So what's the problem?
--
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ICQ: 205544826
What about
int = Integer(i_str)
?
It accepts leading whitespace, but apart from that it's pretty picky.
Mike
On 26-Aug-07, at 4:32 PM, James Edward Gray II wrote:
On Aug 26, 2007, at 3:26 PM, Kenneth McDonald wrote:
The real problem is:
irb(main):002:0> "12,345".to_i
=> 12Basically, Ruby converts anything that starts with an int, which is really quite nasty in a case such as the above. I spent a lot of time tracking down that problem.
So, I want an integer conversion function that throws an error if the _entire_ string can't be interpreted as an integer; the Ruby analog to the standard string-to-int conversion function in most other languages.
raise "Bad integer" unless i_str =~ /\A-?\d+\z/
--
Mike Stok <mike@stok.ca>
http://www.stok.ca/~mike/
The "`Stok' disclaimers" apply.
James Edward Gray II wrote:
raise "Bad integer" unless i_str =~ /\A-?\d+\z/
Depending on your needs (do you want to accept all the strings that ruby accepts as integers?), you might want to add _ to that regex (also, preceding '+' char):
irb(main):001:0> i_str = "12_345"
=> "12_345"
irb(main):002:0> raise "Bad integer" unless i_str =~ /\A-?\d+\z/
RuntimeError: Bad integer
from (irb):2
irb(main):003:0> Integer(i_str)
=> 12345
But getting that right is harder than just using Integer().
--
vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407
Mike Stok wrote:
The real problem is:
irb(main):002:0> "12,345".to_i
=> 12Basically, Ruby converts anything that starts with an int, which is really quite nasty in a case such as the above. I spent a lot of time tracking down that problem.
So, I want an integer conversion function that throws an error if the _entire_ string can't be interpreted as an integer; the Ruby analog to the standard string-to-int conversion function in most other languages.
raise "Bad integer" unless i_str =~ /\A-?\d+\z/
What about
int = Integer(i_str)
?
It accepts leading whitespace, but apart from that it's pretty picky.
Mike
This is what I was looking for. There's nothing wrong with the regexp solution of course, it's just that Simpler is Nicer :-). Many thanks to both of you.
Cheers,
Ken
On 26-Aug-07, at 4:32 PM, James Edward Gray II wrote:
On Aug 26, 2007, at 3:26 PM, Kenneth McDonald wrote:
--
Mike Stok <mike@stok.ca>
Mike StokThe "`Stok' disclaimers" apply.