复制对象数组并进行更改,而无需修改原始数组 [英] Copy array of objects and make changes without modifying original array
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问题描述
我有一个对象数组.我想深入复制对象数组并对每个对象进行一些更改.我想这样做而不修改原始数组或该数组中的原始对象.
I have an array of objects. I would like to deep copy the array of objects and make some changes to each object. I want to do this without modifying the original array or original objects that were in that array.
这就是我做到的方式.但是,作为JavaScript的新手,我想确保这是一个好方法.
This is the way I have done it. However, being new to JavaScript I want to make sure this is a good approach.
有更好的方法吗?
const users =
[
{
id : 1,
name : 'Jack',
approved : false
},
{
id : 2,
name : 'Bill',
approved : true
},
{
id : 3,
name : 'Rick',
approved : false
},
{
id : 4,
name : 'Rick',
approved : true
}
];
const users2 =
users
.map(
(u) =>
{
return Object.assign({}, u);
}
)
.map(
(u) =>
{
u.approved = true;
return u;
}
);
console.log('New users2 array of objects:')
console.log(users2);
console.log('This was original users array is untouched:')
console.log(users);
输出:
New users2 array of objects:
[ { id: 1, name: 'Jack', approved: true },
{ id: 2, name: 'Bill', approved: true },
{ id: 3, name: 'Rick', approved: true },
{ id: 4, name: 'Rick', approved: true } ]
This was original users array is untouched:
[ { id: 1, name: 'Jack', approved: false },
{ id: 2, name: 'Bill', approved: true },
{ id: 3, name: 'Rick', approved: false },
{ id: 4, name: 'Rick', approved: true } ]
推荐答案
For a single pass, you could use Object.assign
with the changed property as well.
const users = [{ id: 1, name: 'Jack', approved: false }, { id: 2, name: 'Bill', approved: true }, { id: 3, name: 'Rick', approved: false }, { id: 4, name: 'Rick', approved: true }];
const users2 = users.map(u => Object.assign({}, u, { approved: true }));
console.log(users2);
console.log(users);
.as-console-wrapper { max-height: 100% !important; top: 0; }
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