JavaScript中的Object.assign（object1 [i]）

Question

Let say, object1 has 10 objects. And this code assigns object1 to object2

const object2 = Object.assign(object1);

But I want to assign 5 objects only from object1 using for loop.

for (let i = 0; i < 5; i++) {
    object2 = Object.assign(object1[i]);
}
// but this one won't work.

Any ideas?

Answer 1

1. I am assuming both obj1 and obj2 are arrays

 var obj1 = [] for (let i=0; i< 10; i++) { obj1.push({key: i}); } var obj2 = [] for (let i=0; i< 5; i++) { obj2.push(obj1[i]); } 

2. I am assuming you're learning Object.assign() . It is used to clone or modify original object to target object

  var obj1 = {key:1, foo: 'bar'}; var obj2 = Object.assign({}, obj1); //clone all properties var obj3 = Object.assign({foo: 'not bar', newprop: 'anything'}, obj1); //copy the original, modify `foo` property and add `newprop` //you can iterate through properties with this for (var property in obj3) { if (obj3.hasOwnProperty(property)) { // do stuff, may be filter which property you want to get, etc } }