如何基于数组和另一个对象创建新对象？

Question

I am trying to create a new object based off an existing array. I want to create a new object that show below

{ jack: 'jack', content: 'ocean'},
{ marie: 'marie', content: 'pond'},
{ james: 'james', content: 'fish biscuit'},
{paul: 'paul', content: 'cake'}

 const words = ['jack','marie','james','paul'] const myUsers = [ { name: 'jack', likes: 'ocean' }, { name: 'marie', likes: 'pond' }, { name: 'james', likes: 'fish biscuits' }, { name: 'paul', likes: 'cake' } ] const usersByLikes = words.map(word => { const container = {}; container[word] = myUsers.map(user => user.name); container.content = myUsers[0].likes; return container; })

I am not getting the correct object, but instead it returns a list.

[ { jack: [ 'shark', 'turtle', 'otter' ], content: 'ocean'}, { marie: [ 'shark', 'turtle', 'otter' ], content: 'ocean' }, { james: [ 'shark', 'turtle', 'otter' ], content: 'ocean' }, { paul: [ 'shark', 'turtle', 'otter' ], content: 'ocean'} ]

Answer 1

What is the role of words array? I think the below code will work.

const result = myUsers.map(user => ({
[user.name]: user.name,
content:  user.likes
}));
console.log('result', result);

In case, if want to filter the users in word array then below solution will work for you.

const result = myUsers.filter(user => {
if (words.includes(user.name)) {
return ({
  [user.name]: user.name,
  content:  user.likes
})
}
return false;
});

You can achieve your need with a single loop.

Answer 2

The answer @aravindan-venkatesan gave should give you the result you are looking for. However important to consider:

When using .map() javascript returns an array of the same length, with whatever transformations you told it to inside map() .

If you want to create a brand new object, of your own construction. Try using .reduce() . This allows you to set an input variable, ie: object, array or string.

Then loop over, and return exactly what you want, not a mapped version of the old array.

See here for more details:

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/reduce