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devexamples

Compact Number Formatting

Format large counts as 1.2K or 3.4M with Intl.NumberFormat compact notation and configurable locale and precision.

JavascriptData Integrity

Code

snippet
export function formatCompactNumber(value, locale = "en", options = {}) {
  if (typeof value !== "number" || !Number.isFinite(value)) {
    throw new TypeError("value must be a finite number");
  }
  const { maximumFractionDigits = 1, ...rest } = options;
  if (!Number.isInteger(maximumFractionDigits) || maximumFractionDigits < 0) {
    throw new RangeError("maximumFractionDigits must be a non-negative integer");
  }
  return new Intl.NumberFormat(locale, {
    notation: "compact",
    compactDisplay: "short",
    maximumFractionDigits,
    ...rest,
  }).format(value);
}

export function formatCompactRange(values, locale = "en") {
  if (!Array.isArray(values)) throw new TypeError("values must be an array");
  return values.map((value) => formatCompactNumber(value, locale)).join(" – ");
}

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