Author image Miko O'Sullivan


Number::Misc - handy utilities for numbers


 use Number::Misc ':all';

 is_numeric('x');        # false
 to_number('3,000');     # 3000
 commafie('3000');       # 3,000
 zero_pad(2, 10);        # 0000000002
 rand_in_range(3, 10);   # a random number from 3 to 10, inclusive
 is_even(3)              # true
 is_odd(4);              # true


Number::Misc provides some miscellaneous handy utilities for handling numbers. These utilities handle processing numbers as strings, determining basic properties of numbers, or selecting a random number from a range.


Number::Misc can be installed with the usual routine:

 perl Makefile.PL
 make test
 make install



Returns true if the given scalar is a number. An undefined value returns false. A "number" is defined as consisting solely of numerals (i.e. the characters 0-9), with at most one decimal, and at most a single leading minus or plus sign.

 is_numeric('3');       # true
 is_numeric('-3');      # true
 is_numeric('+3');      # true
 is_numeric('0003');    # true
 is_numeric('0.003');   # true
 is_numeric('0.00.3');  # false
 is_numeric('3,003');   # false
 is_numeric('  3');     # false
 is_numeric(undef);     # false
option: convertible

If you want to test if the string could be a number if it were run through to_number() then use the convertible option.

 is_numeric('3,003',  convertible=>1);  # true
 is_numeric('  3',    convertible=>1);  # true
 is_numeric('0.00.3', convertible=>1);  # false


Converts a string to a number by removing commas and spaces. If the string can't be converted, returns undef. Some examples:

 to_number(' 3 ');       # returns 3
 to_number(' 3,000 ');   # returns 3000
 to_number('whatever');  # returns undef
option: always_number

If the string cannot be converted to a number, return 0 instead of undef. For example, this call:

 to_number('whatever', always_number=>1)

returns 0.


Converts a number to a string representing the same number but with commas

 commafie(2000);     #  2,000
 commafie(-2000);    # -1,000
 commafie(2000.33);  #  2,000.33
 commafie(100);      #    100

option: sep

The sep option lets you set what to use as a separator instead of a comma. For example, if you want to : instead of , you would do that like this:

 commafie('2000', sep=>':');

which would give you this:



Prepends zeroes to the number to make it a specified length. The first param is the number, the second is the target length. If the length of the number is equal to or longer than the given length then nothing is changed.

 zero_pad(2, 3);   # 002
 zero_pad(2, 10);  # 0000000002
 zero_pad(444, 2); # 444


Given lower and upper bounds, returns a random number greater than or equal to the lower bound and less than or equal to the upper. Works only on integers.

 rand_in_range(3, 10);   # a random number from 3 to 10, inclusive
 rand_in_range(-1, 10);  # a random number from -1 to 10, inclusive

is_even / is_odd

is_even returns true if the number is even. is_odd returns true if the number is odd. Nonnumbers and decimals return undef.

Other modules

Here are a few other modules available on CPAN that do many of the same things as Number::Misc:





Copyright (c) 2012 by Miko O'Sullivan. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. This software comes with NO WARRANTY of any kind.


Miko O'Sullivan


Version 1.0 July, 2012

Initial release.

Version 1.1 April 25, 2014

Fixed problem in META.yml.

Version 1.2 January 2, 2015

Fixed issues in tests. Added 'sep' option to commafie.