INNER CODE UNIT · TypeScript

normalizeArpOrder

scribbletune/scribbletune · src/cli.ts:113

const normalizeArpOrder = (order: string): string => {
  if (!/^\d+$/.test(order)) {
    throw new TypeError('Invalid value for --order');
  }

  // Backward-compatible: if user already uses zero-based (contains 0), keep as is.
  if (order.includes('0')) {
    return order;
  }

  // One-based shorthand (e.g. 1234, 2143) mapped to arp()'s zero-based indices.
  return order
    .split('')
    .map(ch => {
      const n = Number(ch);
      if (n < 1) {
        throw new TypeError('Invalid value for --order');
      }

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