How To Calculate Williams %R in TypeScript?

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function calculateWilliamsR(prices: number[], period: number): number[] {
  const result: number[] = [];

  for (let i = 0; i < prices.length; i++) {
    if (i < period - 1) {
      result.push(null);
    } else {
      const minPrice = Math.min(...prices.slice(i - period + 1, i + 1));
      const maxPrice = Math.max(...prices.slice(i - period + 1, i + 1));
      const currentPrice = prices[i];
      
      const williamsR = ((maxPrice - currentPrice) / (maxPrice - minPrice)) * -100;
      result.push(williamsR);
    }
  }

  return result;
}

// Example usage
const prices = [10, 12, 14, 16, 18, 20, 22];
const period = 5;

const williamsRValues = calculateWilliamsR(prices, period);
console.log(williamsRValues);