Intl.NumberFormat.prototype.formatRangeToParts()

The formatRangeToParts() method of Intl.NumberFormat instances returns an Array of objects containing the locale-specific tokens from which it is possible to build custom strings while preserving the locale-specific parts. This makes it possible to provide locale-aware custom formatting ranges of number strings.

Return value: An Array of objects containing the formatted range in parts. Each object has three properties, type, value, and source, each containing a string. The string concatenation of value, in the order provided, will result in the same string as formatRange(). The type may have the same values as formatToParts(), or the additional value “approximatelySign” (see below). The source can be one of the following:

Syntax example: formatRangeToParts(startRange, endRange)