- N
Formats a number
into a currency string (e.g., $13.65). You
can customize the format in the options
hash.
The currency unit and number formatting of the current locale will be used
unless otherwise specified in the provided options. No currency conversion
is performed. If the user is given a way to change their locale, they will
also be able to change the relative value of the currency displayed with
this helper. If your application will ever support multiple locales, you
may want to specify a constant :locale
option or consider
using a library capable of currency conversion.
Options
-
:locale
- Sets the locale to be used for formatting (defaults to current locale). -
:precision
- Sets the level of precision (defaults to 2). -
:unit
- Sets the denomination of the currency (defaults to “$”). -
:separator
- Sets the separator between the units (defaults to “.”). -
:delimiter
- Sets the thousands delimiter (defaults to “,”). -
:format
- Sets the format for non-negative numbers (defaults to “%u%n”). Fields are%u
for the currency, and%n
for the number. -
:negative_format
- Sets the format for negative numbers (defaults to prepending a hyphen to the formatted number given by:format
). Accepts the same fields than:format
, except%n
is here the absolute value of the number.
Examples
number_to_currency(1234567890.50) # => "$1,234,567,890.50"
number_to_currency(1234567890.506) # => "$1,234,567,890.51"
number_to_currency(1234567890.506, precision: 3) # => "$1,234,567,890.506"
number_to_currency(1234567890.506, locale: :fr) # => "1 234 567 890,51 €"
number_to_currency('123a456') # => "$123a456"
number_to_currency(-1234567890.50, negative_format: '(%u%n)')
# => "($1,234,567,890.50)"
number_to_currency(1234567890.50, unit: '£', separator: ',', delimiter: '')
# => "£1234567890,50"
number_to_currency(1234567890.50, unit: '£', separator: ',', delimiter: '', format: '%n %u')
# => "1234567890,50 £"
Formats a number
with grouped thousands using
delimiter
(e.g., 12,324). You can customize the format in the
options
hash.
Options
-
:locale
- Sets the locale to be used for formatting (defaults to current locale). -
:delimiter
- Sets the thousands delimiter (defaults to “,”). -
:separator
- Sets the separator between the fractional and integer digits (defaults to “.”). -
:delimiter_pattern
- Sets a custom regular expression used for deriving the placement of delimiter. Helpful when using currency formats like INR.
Examples
number_to_delimited(12345678) # => "12,345,678"
number_to_delimited('123456') # => "123,456"
number_to_delimited(12345678.05) # => "12,345,678.05"
number_to_delimited(12345678, delimiter: '.') # => "12.345.678"
number_to_delimited(12345678, delimiter: ',') # => "12,345,678"
number_to_delimited(12345678.05, separator: ' ') # => "12,345,678 05"
number_to_delimited(12345678.05, locale: :fr) # => "12 345 678,05"
number_to_delimited('112a') # => "112a"
number_to_delimited(98765432.98, delimiter: ' ', separator: ',')
# => "98 765 432,98"
number_to_delimited("123456.78",
delimiter_pattern: /(\d+?)(?=(\d\d)+(\d)(?!\d))/)
# => "1,23,456.78"
Pretty prints (formats and approximates) a number in a way it is more readable by humans (eg.: 1200000000 becomes “1.2 Billion”). This is useful for numbers that can get very large (and too hard to read).
See number_to_human_size
if you want to print a file size.
You can also define your own unit-quantifier names if you want to use other decimal units (eg.: 1500 becomes “1.5 kilometers”, 0.150 becomes “150 milliliters”, etc). You may define a wide range of unit quantifiers, even fractional ones (centi, deci, mili, etc).
Options
-
:locale
- Sets the locale to be used for formatting (defaults to current locale). -
:precision
- Sets the precision of the number (defaults to 3). -
:significant
- Iftrue
, precision will be the number of significant_digits. Iffalse
, the number of fractional digits (defaults totrue
) -
:separator
- Sets the separator between the fractional and integer digits (defaults to “.”). -
:delimiter
- Sets the thousands delimiter (defaults to “”). -
:strip_insignificant_zeros
- Iftrue
removes insignificant zeros after the decimal separator (defaults totrue
) -
:units
- A Hash of unit quantifier names. Or a string containing an i18n scope where to find this hash. It might have the following keys:-
integers:
:unit
,:ten
,:hundred
,:thousand
,:million
,:billion
,:trillion
,:quadrillion
-
fractionals:
:deci
,:centi
,:mili
,:micro
,:nano
,:pico
,:femto
-
-
:format
- Sets the format of the output string (defaults to “%n %u”). The field types are:-
%u - The quantifier (ex.: 'thousand')
-
%n - The number
-
Examples
number_to_human(123) # => "123"
number_to_human(1234) # => "1.23 Thousand"
number_to_human(12345) # => "12.3 Thousand"
number_to_human(1234567) # => "1.23 Million"
number_to_human(1234567890) # => "1.23 Billion"
number_to_human(1234567890123) # => "1.23 Trillion"
number_to_human(1234567890123456) # => "1.23 Quadrillion"
number_to_human(1234567890123456789) # => "1230 Quadrillion"
number_to_human(489939, precision: 2) # => "490 Thousand"
number_to_human(489939, precision: 4) # => "489.9 Thousand"
number_to_human(1234567, precision: 4,
significant: false) # => "1.2346 Million"
number_to_human(1234567, precision: 1,
separator: ',',
significant: false) # => "1,2 Million"
number_to_human(500000000, precision: 5) # => "500 Million"
number_to_human(12345012345, significant: false) # => "12.345 Billion"
Non-significant zeros after the decimal separator are stripped out by
default (set :strip_insignificant_zeros
to false
to change that):
#number_to_human(12.00001) # => “12” #number_to_human(12.00001, strip_insignificant_zeros: false) # => “12.0”
Custom Unit Quantifiers
You can also use your own custom unit quantifiers:
number_to_human(500000, units: { unit: 'ml', thousand: 'lt' }) # => "500 lt"
If in your I18n locale you have:
distance:
centi:
one: "centimeter"
other: "centimeters"
unit:
one: "meter"
other: "meters"
thousand:
one: "kilometer"
other: "kilometers"
billion: "gazillion-distance"
Then you could do:
number_to_human(543934, units: :distance) # => "544 kilometers"
number_to_human(54393498, units: :distance) # => "54400 kilometers"
number_to_human(54393498000, units: :distance) # => "54.4 gazillion-distance"
number_to_human(343, units: :distance, precision: 1) # => "300 meters"
number_to_human(1, units: :distance) # => "1 meter"
number_to_human(0.34, units: :distance) # => "34 centimeters"
Formats the bytes in number
into a more understandable
representation (e.g., giving it 1500 yields 1.5 KB). This method is useful
for reporting file sizes to users. You can customize the format in the
options
hash.
See number_to_human
if you want to pretty-print a generic
number.
Options
-
:locale
- Sets the locale to be used for formatting (defaults to current locale). -
:precision
- Sets the precision of the number (defaults to 3). -
:significant
- Iftrue
, precision will be the number of significant_digits. Iffalse
, the number of fractional digits (defaults totrue
) -
:separator
- Sets the separator between the fractional and integer digits (defaults to “.”). -
:delimiter
- Sets the thousands delimiter (defaults to “”). -
:strip_insignificant_zeros
- Iftrue
removes insignificant zeros after the decimal separator (defaults totrue
)
Examples
number_to_human_size(123) # => "123 Bytes"
number_to_human_size(1234) # => "1.21 KB"
number_to_human_size(12345) # => "12.1 KB"
number_to_human_size(1234567) # => "1.18 MB"
number_to_human_size(1234567890) # => "1.15 GB"
number_to_human_size(1234567890123) # => "1.12 TB"
number_to_human_size(1234567890123456) # => "1.1 PB"
number_to_human_size(1234567890123456789) # => "1.07 EB"
number_to_human_size(1234567, precision: 2) # => "1.2 MB"
number_to_human_size(483989, precision: 2) # => "470 KB"
number_to_human_size(1234567, precision: 2, separator: ',') # => "1,2 MB"
number_to_human_size(1234567890123, precision: 5) # => "1.1228 TB"
number_to_human_size(524288000, precision: 5) # => "500 MB"
Formats a number
as a percentage string (e.g., 65%). You can
customize the format in the options
hash.
Options
-
:locale
- Sets the locale to be used for formatting (defaults to current locale). -
:precision
- Sets the precision of the number (defaults to 3). Keeps the number's precision ifnil
. -
:significant
- Iftrue
, precision will be the number of significant_digits. Iffalse
, the number of fractional digits (defaults tofalse
). -
:separator
- Sets the separator between the fractional and integer digits (defaults to “.”). -
:delimiter
- Sets the thousands delimiter (defaults to “”). -
:strip_insignificant_zeros
- Iftrue
removes insignificant zeros after the decimal separator (defaults tofalse
). -
:format
- Specifies the format of the percentage string The number field is%n
(defaults to “%n%”).
Examples
number_to_percentage(100) # => "100.000%"
number_to_percentage('98') # => "98.000%"
number_to_percentage(100, precision: 0) # => "100%"
number_to_percentage(1000, delimiter: '.', separator: ',') # => "1.000,000%"
number_to_percentage(302.24398923423, precision: 5) # => "302.24399%"
number_to_percentage(1000, locale: :fr) # => "1000,000%"
number_to_percentage(1000, precision: nil) # => "1000%"
number_to_percentage('98a') # => "98a%"
number_to_percentage(100, format: '%n %') # => "100.000 %"
Formats a number
into a phone number (US by default e.g.,
(555) 123-9876). You can customize the format in the options
hash.
Options
-
:area_code
- Adds parentheses around the area code. -
:delimiter
- Specifies the delimiter to use (defaults to “-”). -
:extension
- Specifies an extension to add to the end of the generated number. -
:country_code
- Sets the country code for the phone number. -
:pattern
- Specifies how the number is divided into three groups with the custom regexp to override the default format.
Examples
number_to_phone(5551234) # => "555-1234"
number_to_phone('5551234') # => "555-1234"
number_to_phone(1235551234) # => "123-555-1234"
number_to_phone(1235551234, area_code: true) # => "(123) 555-1234"
number_to_phone(1235551234, delimiter: ' ') # => "123 555 1234"
number_to_phone(1235551234, area_code: true, extension: 555) # => "(123) 555-1234 x 555"
number_to_phone(1235551234, country_code: 1) # => "+1-123-555-1234"
number_to_phone('123a456') # => "123a456"
number_to_phone(1235551234, country_code: 1, extension: 1343, delimiter: '.')
# => "+1.123.555.1234 x 1343"
number_to_phone(75561234567, pattern: /(\d{1,4})(\d{4})(\d{4})$/, area_code: true)
# => "(755) 6123-4567"
number_to_phone(13312345678, pattern: /(\d{3})(\d{4})(\d{4})$/)
# => "133-1234-5678"
Formats a number
with the specified level of
:precision
(e.g., 112.32 has a precision of 2 if
:significant
is false
, and 5 if
:significant
is true
). You can customize the
format in the options
hash.
Options
-
:locale
- Sets the locale to be used for formatting (defaults to current locale). -
:precision
- Sets the precision of the number (defaults to 3). Keeps the number's precision ifnil
. -
:significant
- Iftrue
, precision will be the number of significant_digits. Iffalse
, the number of fractional digits (defaults tofalse
). -
:separator
- Sets the separator between the fractional and integer digits (defaults to “.”). -
:delimiter
- Sets the thousands delimiter (defaults to “”). -
:strip_insignificant_zeros
- Iftrue
removes insignificant zeros after the decimal separator (defaults tofalse
).
Examples
number_to_rounded(111.2345) # => "111.235"
number_to_rounded(111.2345, precision: 2) # => "111.23"
number_to_rounded(13, precision: 5) # => "13.00000"
number_to_rounded(389.32314, precision: 0) # => "389"
number_to_rounded(111.2345, significant: true) # => "111"
number_to_rounded(111.2345, precision: 1, significant: true) # => "100"
number_to_rounded(13, precision: 5, significant: true) # => "13.000"
number_to_rounded(13, precision: nil) # => "13"
number_to_rounded(111.234, locale: :fr) # => "111,234"
number_to_rounded(13, precision: 5, significant: true, strip_insignificant_zeros: true)
# => "13"
number_to_rounded(389.32314, precision: 4, significant: true) # => "389.3"
number_to_rounded(1111.2345, precision: 2, separator: ',', delimiter: '.')
# => "1.111,23"