两个foreach替换JS

Question

能否请您推荐更优雅的处理这些案例的方法？

const arr1 = [1, 2, 3];
const arr2 = ['a', 'b', 'c'];

const getCombinations = () => {
  const combinations = [];
  arr1.forEach(el1 => {
    arr2.forEach(el2 => {
      combinations.push({
        el1,
        el2
      });
    });
  });
  return combinations;
};

console.log(getCombinations());

Answer 1

您可以使用Array.flatMap()具有Array.map():

const arr1 = [1, 2, 3];
const arr2 = ['a', 'b', 'c'];

const getCombinations = (a, b) => 
  a.flatMap(el1 => b.map(el2 => ({ el1, el2 })));

const result = getCombinations(arr1, arr2);

console.log(result);