number-formatter.md

.numberFormatter( [options] ) ➜ function( value )

Return a function that formats a number according to the given options.

The returned function is invoked with one argument: the Number value to be formatted.

Parameters

options.style

Optional. String decimal (default), or percent.

options.minimumIntegerDigits

Optional. Non-negative integer Number value indicating the minimum integer digits to be used. Numbers will be padded with leading zeroes if necessary.

options.minimumFractionDigits, options.maximumFractionDigits

Optional. Non-negative integer Number values indicating the minimum and maximum fraction digits to be used. Numbers will be rounded or padded with trailing zeroes if necessary. Either one or both of these properties must be present. If they are, they will override minimum and maximum fraction digits derived from the CLDR patterns.

options.minimumSignificantDigits, options.maximumSignificantDigits

Optional. Positive integer Number values indicating the minimum and maximum fraction digits to be shown. Either none or both of these properties are present. If they are, they override minimum and maximum integer and fraction digits. The formatter uses however many integer and fraction digits are required to display the specified number of significant digits.

options.round

Optional. String with rounding method ceil, floor, round (default), or truncate.

options.useGrouping

Optional. Boolean (default is true) value indicating whether a grouping separator should be used.

options.compact

Optional. String short or long indicating which compact number format should be used to represent the number.

Examples

Static Formatter

Prior to using any number methods, you must load cldr/main/{locale}/numbers.json and cldr/supplemental/numberingSystems.json. Read CLDR content if you need more information.

You can use the static method Globalize.numberFormatter(), which uses the default locale.

var formatter;

Globalize.locale( "en" );
formatter = Globalize.numberFormatter();

formatter( 3.141592 );
// > "3.142"

Instance Formatter

You can use the instance method .numberFormatter(), which uses the instance locale.

var arFormatter = Globalize( "ar" ).numberFormatter(),
  esFormatter = Globalize( "es" ).numberFormatter(),
  zhFormatter = Globalize( "zh-u-nu-native" ).numberFormatter();

arFormatter( 3.141592 );
// > "٣٫١٤٢"

esFormatter( 3.141592 );
// > "3,142"

zhFormatter( 3.141592 );
// > "三.一四二"

Configuring decimal places

The number of decimal places can be decreased or increased using minimumFractionDigits and maximumFractionDigits.

Globalize.numberFormatter({ maximumFractionDigits: 2 })( 3.141592 );
// > "3.14"

Globalize.numberFormatter({ minimumFractionDigits: 2 })( 1.5 );
// > "1.50"

Configuring significant digits

The number of significant (non-zero) digits can be decreased or increased using minimumSignificantDigits and maximumSignificantDigits.

var formatter = Globalize.numberFormatter({
  minimumSignificantDigits: 1,
  maximumSignificantDigits: 3
});

formatter( 3.141592 );
// > "3.14"

formatter = Globalize.numberFormatter({
  minimumSignificantDigits: 1,
  maximumSignificantDigits: 3
});

formatter( 12345 );
// > "12,300"

formatter = Globalize.numberFormatter({
  minimumSignificantDigits: 1,
  maximumSignificantDigits: 3
});

formatter( 0.00012345 );
// > "0.000123"

Formatting Percentages

Numbers can be formatted as percentages.

var enFormatter = Globalize( "en" ).numberFormatter({
  style: "percent",
  minimumFractionDigits: 1,
  maximumFractionDigits: 1
});

var frFormatter = Globalize( "fr" ).numberFormatter({
  style: "percent",
  minimumFractionDigits: 2,
  maximumFractionDigits: 2
});

enFormatter( 0.0016 );
// > "0.2%"

enFormatter( 0.0014 );
// > "0.1%"

frFormatter( 0.0005 );
// > "0,05 %"

Formatting Compact Numbers

Long numbers can be represented in a compact format, with short using abbreviated units and long using the full unit name.

var shortFormatter = Globalize( "en" ).numberFormatter({
  compact: "short"
});

var longFormatter = Globalize( "en" ).numberFormatter({
  compact: "long"
});

shortFormatter( 27588910 );
// > "28M"

longFormatter( 27588910 );
// > "28 million"

The minimumSignificantDigits and maximumSignificantDigits options are specially useful to control the number of digits to display.

Globalize( "en" ).formatNumber( 27588910, {
  compact: "short",
  minimumSignificantDigits: 3,
  maximumSignificantDigits: 3
});
// > "27.6M"

Configuring Rounding

Numbers with a decreased amount of decimal places can be rounded up, rounded down, rounded arithmetically, or truncated by setting the round option to ceil, floor, round (default), or truncate.

var formatter = Globalize.numberFormatter({
  maximumFractionDigits: 2,
  round: "ceil"
});

formatter( 3.141592 );
// > "3.15"

Performance Suggestions

For improved performance on iterations, the formatter should be created before the loop. Then, it can be reused in each iteration.

var numbers = [ 1, 1, 2, 3, ... ];
var formatter = Globalize( "en" ).numberFormatter();

formattedNumbers = numbers.map(function( number ) {
  return formatter( number );
});