The formatRange() method of Intl.NumberFormat instances formats a range of numbers according to the locale and formatting options of this Intl.NumberFormat object.

Syntax

formatRange(startRange, endRange)

Parameters

startRange

A Number, BigInt, or string, to format. Strings are parsed in the same way as in number conversion, except that formatRange() will use the exact value that the string represents, avoiding loss of precision during implicitly conversion to a number.

endRange

A Number, BigInt, or string, to format.

Return value

A string representing the given range of numbers formatted according to the locale and formatting options of this Intl.NumberFormat object. If the start and end values are formatted to the same string, the output will only contain a single value, possibly prefixed with an "approximately equals" symbol (e.g., "~$3"). The insertion of this symbol only depends on the locale settings, and is inserted even when startRange === endRange.

Exceptions

RangeError

Thrown if either startRange or endRange is NaN or an inconvertible string.

TypeError

Thrown if either startRange or endRange is undefined.

Description

The formatRange getter function formats a range of numbers into a string according to the locale and formatting options of this Intl.NumberFormat object from which it is called.

Examples

Using formatRange

Use the formatRange getter function for formatting a range of currency values:

const nf = new Intl.NumberFormat("en-US", {
  style: "currency",
  currency: "USD",
  maximumFractionDigits: 0,
});

console.log(nf.formatRange(3, 5)); // "$3 – $5"

// Note: the "approximately equals" symbol is added if
// startRange and endRange round to the same values.
console.log(nf.formatRange(2.9, 3.1)); // "~$3"

const nf = new Intl.NumberFormat("es-ES", {
  style: "currency",
  currency: "EUR",
  maximumFractionDigits: 0,
});

console.log(nf.formatRange(3, 5)); // "3-5 €"
console.log(nf.formatRange(2.9, 3.1)); // "~3 €"

Specifications

Browser compatibility

See also

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