你能使用Array.flatMap在Javascript中返回n选择k组合吗？

function getCombinations(elements, k) {
  if (k === 0) {
    return [[]]; // 返回空组合
  }
  if (elements.length === 0 || k > elements.length) {
    return []; // 无法形成组合
  }
  
  return elements.flatMap((element, index) => {
    const combinations = getCombinations(elements.slice(index + 1), k - 1);
    return combinations.map((combination) => [element, ...combination]);
  });
}

const elements = [1, 2, 3, 4, 5];
const k = 3;
const combinations = getCombinations(elements, k);
console.log(combinations);

[
  [1, 2, 3],
  [1, 2, 4],
  [1, 2, 5],
  [1, 3, 4],
  [1, 3, 5],
  [1, 4, 5],
  [2, 3, 4],
  [2, 3, 5],
  [2, 4, 5],
  [3, 4, 5]
]