Function ToRawFixed

packages/ecma402-abstract/NumberFormat/ToRawFixed.ts:43–141

(
  x: Decimal,
  minFraction: number,
  maxFraction: number,
  roundingIncrement: number,
  unsignedRoundingMode: UnsignedRoundingModeType
)

 * @param maxFraction an integer between 0 and 20
 */
export function ToRawFixed(
  x: Decimal,
  minFraction: number,
  maxFraction: number,
  roundingIncrement: number,
  unsignedRoundingMode: UnsignedRoundingModeType
): RawNumberFormatResult {
  // 1. Let f be maxFraction.
  const f = maxFraction

  // 2. Let n1 and r1 be the results of performing the maximized rounding of x to f fraction digits.
  const {n1, r1} = findN1R1(x, f, roundingIncrement)

  // 3. Let n2 and r2 be the results of performing the minimized rounding of x to f fraction digits.
  const {n2, r2} = findN2R2(x, f, roundingIncrement)

  // 4. Let r be ApplyUnsignedRoundingMode(x, r1, r2, unsignedRoundingMode).
  const r = ApplyUnsignedRoundingMode(x, r1, r2, unsignedRoundingMode)

  let n: Decimal, xFinal: Decimal
  let m: string

  // 5. If r is equal to r1, then
  if (r.eq(r1)) {
    // a. Let n be n1.
    n = n1
    // b. Let xFinal be r1.
    xFinal = r1
  } else {
    // 6. Else,
    // a. Let n be n2.
    n = n2
    // b. Let xFinal be r2.
    xFinal = r2
  }

  // 7. If n is 0, let m be "0".
  if (n.isZero()) {
    m = '0'
  } else {
    // 8. Else, let m be the String representation of n.
    m = n.toString()
  }

  let int

  // 9. If f is not 0, then
  if (f !== 0) {
    // a. Let k be the length of m.
    let k = m.length

    // b. If k < f, then
    if (k <= f) {
      // i. Let z be the String value consisting of f + 1 - k occurrences of the character "0".
      const z = repeat('0', f - k + 1)
      // ii. Set m to the string-concatenation of z and m.
      m = z + m
      // iii. Set k to f + 1.