Hi friends
I want to check the value is numeric or not
For example
when i am checking numeric or not am expecting as below results
"34" => true
34 => true
"34sdfds" => it should return false
34.90 => false
am using ruby 1.8.7. can anyone suggest isthere is anymethod exist to
check these
--
Posted via http://www.ruby-forum.com/.
def is_numeric(o)
true if Integer(o) rescue false
end
On Thu, 12 Jul 2012 19:16:08 +0900 Lucky Nl <lists@ruby-forum.com> wrote:
Hi friends
I want to check the value is numeric or not
For example
when i am checking numeric or not am expecting as below results
"34" => true
34 => true
"34sdfds" => it should return false
34.90 => falseam using ruby 1.8.7. can anyone suggest isthere is anymethod exist to
check these
--
Sincerely yours,
Aleksey V. Zapparov A.K.A. ixti
FSF Member #7118
Mobile Phone: +34 677 990 688
Homepage: http://www.ixti.net
JID: zapparov@jabber.ru
*Origin: Happy Hacking!
I want to check the value is numeric or not
According to your example you want to check whether a string
represents an integer value (floats are numeric, too).
For example
when i am checking numeric or not am expecting as below results
"34" => true
34 => true
"34sdfds" => it should return false
34.90 => false
You can use Integer() to do that:
Ruby version 1.8.7
irb(main):001:0> %w{34 34sdfds 34.90}.each do |s| printf "%p: %p\n",
s, (Integer(s) rescue false) end
"34": 34
"34sdfds": false
"34.90": false
=> ["34", "34sdfds", "34.90"]
But actually you do not need a separate check, just use Integer to
convert the string to a Fixnum / Bignum and deal with the exception.
Kind regards
robert
On Thu, Jul 12, 2012 at 12:16 PM, Lucky Nl <lists@ruby-forum.com> wrote:
--
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/
Aleksey Zapparov wrote in post #1068416:
check these
def is_numeric(o)
true if Integer(o) rescue false
end
This may not be exactly what is wanted:
Integer("0x123")
=> 291
If you just want to allow digits and nothing else, use a regexp:
/\A\d+\z/ =~ o
Also, note that "is_numeric" isn't an ideal name, because Numeric
includes Float.
Float.ancestors
=> [Float, Precision, Numeric, Comparable, Object, Kernel]
On Thu, 12 Jul 2012 19:16:08 +0900 > Lucky Nl <lists@ruby-forum.com> wrote:
--
Posted via http://www.ruby-forum.com/\.
or
/\A\d+\z/ === o
which returns true or false (instead of 0 or nil)
Am 12.07.2012 21:46, schrieb Brian Candler:
If you just want to allow digits and nothing else, use a regexp:
/\A\d+\z/ =~ o
If o is allowed to be a Fixnum, you need to cast to string first:
/\A\d+\z/ === o.to_s
Alternatively
!!o.to_s[/\A\d+\z/]
On 07/12/2012 10:30 PM, sto.mar@web.de wrote:
Am 12.07.2012 21:46, schrieb Brian Candler:
If you just want to allow digits and nothing else, use a regexp:
/\A\d+\z/ =~ oor
/\A\d+\z/ === o
which returns true or false (instead of 0 or nil)
--
Lars Haugseth
WTF? (That's the first time I remember me writing this here.)
Let me get that straight: you want to convert something which you
*know* is an integer to a String to check whether it is an integer?
If o is allowed to be an integer type then you would better check that
directly (e.g. with Integer === o). But it get's better:
irb(main):010:0> a=[1,1<<50,"1"]
=> [1, 1125899906842624, "1"]
irb(main):011:0> a.each {|x| y=Integer(x); printf "type %p converted
%p type %p\n", x.class, y, y.class}
type Fixnum converted 1 type Fixnum
type Bignum converted 1125899906842624 type Bignum
type String converted 1 type Fixnum
=> [1, 1125899906842624, "1"]
Cheers
robert
On Fri, Jul 13, 2012 at 10:19 AM, Lars Haugseth <ruby-talk@larshaugseth.com> wrote:
If o is allowed to be a Fixnum, you need to cast to string first:
/\A\d+\z/ === o.to_s
--
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/
Not quite. The question was about checking a value that could be a string, integer, float or presumably anything, and return true if the value contains digits only, false otherwise. At least that's how I interpret the message starting this thread.
On 07/13/2012 11:08 AM, Robert Klemme wrote:
On Fri, Jul 13, 2012 at 10:19 AM, Lars Haugseth > <ruby-talk@larshaugseth.com> wrote:
If o is allowed to be a Fixnum, you need to cast to string first:
/\A\d+\z/ === o.to_s
WTF? (That's the first time I remember me writing this here.)
Let me get that straight: you want to convert something which you
*know* is an integer to a String to check whether it is an integer?
--
Lars Haugseth
seems the original post is not very clear,
the subject line implies only strings, the post itself does not.
Am 13.07.2012 11:41, schrieb Lars Haugseth:
On 07/13/2012 11:08 AM, Robert Klemme wrote:
Not quite. The question was about checking a value that could be a
string, integer, float or presumably anything, and return true if the
value contains digits only, false otherwise. At least that's how I
interpret the message starting this thread.