is_numeric

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

to_number

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.

commafie

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:

2:000

zero_pad

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

rand_in_range

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.