Question

我要减少对象数组，例如：

const users = [
    {id: 1, username: 'foo'}, 
    {id: 2, username: 'bar'}, 
    {id: 3, username: 'baz'}
];

到ID数组，例如：

users.reduce( magicReducer ); // output: [1,2,3]

可能吗？

Answer 1

这应该可以为您解决问题！

const users = [{id: 1, username: 'foo'}, {id: 2, username: 'bar'}, {id: 3, username: 'baz'}];

console.log(users.map(user => user.id))

Answer 2

您不需要reduce来获得所需的魔法，只需使用数组.map()即可，例如：

const users = [{id: 1, username: 'foo'}, {id: 2, username: 'bar'}, {id: 3, username: 'baz'}];
const res = users.map(({id}) => id);

console.log(res)

Answer 3

尝试

const users = [
    {id: 1, username: 'foo'}, 
    {id: 2, username: 'bar'}, 
    {id: 3, username: 'baz'}
];

ids=users.map(x=>x.id)
console.log(ids)

Javascript：在属性数组中减少对象数组

3 个答案: