@onesy/algorithms/esm/factorial.js

Algorithms

const cache = {};
export default function factorial(value) {
  let options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {
    cache: true
  };
  // Cache
  if (options?.cache && cache[value] !== undefined) return cache[value];
  if (value < 3) return value;
  const values = [0, 1, 2];
  for (let i = 3; i <= value; i++) values[i] = i * values[i - 1];
  const result = values[values.length - 1];
  if (options?.cache && cache[value] === undefined) cache[value] = result;
  return result;
}