假设您具有以下代码来过滤动物,以仅保存比数组中前一个动物重量更大的动物(因为没有前一个动物,因此永远不会保存第一个对象):
const animals = [
{ id: 3, weight: 300, type: 'pig' },
{ id: 1, weight: 200, type: "cow" },
{ id: 7, weight: 400, type: "horse" },
{ id: 6, weight: 100, type: "pig" },
];
const filteredAnimals = animals.filter((animal, index) =>
animals[index - 1] && animal.weight > animals[index - 1].weight);
console.log('filtered animals: ', filteredAnimals);
这可以按预期工作,但我无法弄清楚如何应用具有数组数组的相同过滤器:
const animals = [
[
{ id: 5, weight: 300, type: 'pig' },
{ id: 1, weight: 200, type: "cow" },
{ id: 3, weight: 400, type: "horse" },
{ id: 4, weight: 350, type: "pig" },
],
[
{ id: 2, weight: 250, type: "horse" },
{ id: 6, weight: 350, type: 'pig' },
{ id: 8, weight: 250, type: "cow" },
{ id: 7, weight: 400, type: "pig" },
]
]
在这种情况下,预期结果应为:
const filteredAnimals = [
[
{ id: 3, weight: 400, type: "horse" },
],
[
{ id: 6, weight: 350, type: "pig" },
{ id: 7, weight: 400, type: "pig" },
]
]
关于如何实现这一目标的任何建议?
答案 0 :(得分:3)
只需将filter
包围在.map
中,即可遍历所有子数组:
const animals = [
[
{ id: 5, weight: 300, type: 'pig' },
{ id: 1, weight: 200, type: "cow" },
{ id: 3, weight: 400, type: "horse" },
{ id: 4, weight: 350, type: "pig" },
],
[
{ id: 2, weight: 250, type: "horse" },
{ id: 6, weight: 350, type: 'pig' },
{ id: 8, weight: 250, type: "cow" },
{ id: 7, weight: 400, type: "pig" },
]
]
const filteredAnimals = animals.map(
subarr => subarr.filter((animal, index) =>
subarr[index - 1] && animal.weight > subarr[index - 1].weight
)
);
console.log(filteredAnimals);