Intl.numberFormat.format

The Intl.NumberFormat.prototype.format property returns a getter function that formats a number according to the locale and formatting options of this NumberFormat object.

Syntax

numberFormat.format(number)

Parameters

number

The number to format.

Description

The function returned by the format getter formats a number into a string according to the locale and formatting options of this NumberFormat object.

Examples

Using format

Use the function returned by the format getter for formatting a single currency value, here for Russia:

var options = { style: 'currency', currency: 'RUB' };
var numberFormat = new Intl.NumberFormat('ru-RU', options);
console.log(numberFormat.format(654321.987));
// → "654 321,99 руб."

Using format with map

Use the function returned by the format getter for formatting all numbers in an array. Note that the function is bound to the NumberFormat from which it was obtained, so it can be passed directly to Array.prototype.map.

var a = [123456.789, 987654.321, 456789.123];
var numberFormat = new Intl.NumberFormat('es-ES');
var formatted = a.map(numberFormat.format);
console.log(formatted.join('; '));
// → "123.456,789; 987.654,321; 456.789,123"

Specifications

Specification	Status	Comment
ECMAScript Internationalization API 1.0 (ECMA-402) The definition of 'Intl.NumberFormat.prototype.format' in that specification.	Standard	Initial definition.
ECMAScript Internationalization API 2.0 (ECMA-402) The definition of 'Intl.NumberFormat.prototype.format' in that specification.	Standard
ECMAScript Internationalization API 4.0 (ECMA-402) The definition of 'Intl.NumberFormat.prototype.format' in that specification.	Draft

Browser compatibility

See also

• Intl.NumberFormat
• Number.prototype.toLocaleString()