Function formatNumber

lib/internal/util/inspect.js:2191–2223

(fn, number, numericSeparator)

const remainingText = (remaining) => `... ${remaining} more item${remaining > 1 ? 's' : ''}`;

function formatNumber(fn, number, numericSeparator) {
  // Format -0 as '-0'. Checking `number === -0` won't distinguish 0 from -0.
  // String(-0) === '0', so this must be checked before any String() conversion.
  if (ObjectIs(number, -0)) {
    return fn('-0', 'number');
  }
  if (!numericSeparator) {
    return fn(`${number}`, 'number');
  }

  const numberString = String(number);
  const integer = MathTrunc(number);

  if (integer === number) {
    if (!NumberIsFinite(number) || StringPrototypeIncludes(numberString, 'e')) {
      return fn(numberString, 'number');
    }
    return fn(addNumericSeparator(numberString), 'number');
  }
  if (NumberIsNaN(number) || StringPrototypeIncludes(numberString, 'e')) {
    return fn(numberString, 'number');
  }

  const decimalIndex = StringPrototypeIndexOf(numberString, '.');
  const integerPart = StringPrototypeSlice(numberString, 0, decimalIndex);
  const fractionalPart = StringPrototypeSlice(numberString, decimalIndex + 1);

  return fn(`${
    addNumericSeparator(integerPart)
  }.${
    addNumericSeparatorEnd(fractionalPart)
  }`, 'number');
}

function formatBigInt(fn, bigint, numericSeparator) {
  const string = String(bigint);