JSworkingevergreen
Intl.NumberFormat
Localised, by the runtime.
Stop hand-rolling currency strings and percentage formatters. The browser ships a full ICU-backed localisation library.
Currency formatting
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The same number renders as 112.358,13 €, $112,358.13, and £112,358.13 — each locale picks its own grouping/decimal separators and symbol placement (trailing for de-DE, leading for the English locales), so you never hand-assemble a currency string yourself.