How do I replace in a javascript array? [duplicate]

Question

Given

const allPost = [{_id: "uniqueId1", "name": "Bob"}, {_id: "uniqueId2", "name": "Sam"}]
const changeTo = {_id: "uniqueId1", "name": "Tim"}

I want to change to the given allPost object so it becomes

const allPost = [{_id: "uniqueId1", "name": "Tim"}, {_id: "uniqueId2", "name": "Sam"}]

I tried this but it does not work

const allPost = [{_id: "uniqueId1", "name": "Bob"}, {_id: "uniqueId2", "name": "Sam"}]
const changeTo = {_id: "uniqueId1", "name": "Tim"}
const newPost = allPost.filter((post) => {
    if(post._id === changeTo._id) {
        post = changeTo
    }

})

Anyway to accomplish this?

Giovanni Esposito · Accepted Answer · 2020-08-12 06:49:45Z

0

Ciao, you can use a map function like this:

const allPost = [{_id: "uniqueId1", "name": "Bob"}, {_id: "uniqueId2", "name": "Sam"}]
const changeTo = {_id: "uniqueId1", "name": "Tim"}
const newPost = allPost.map((post) => {
    if(post._id === changeTo._id) return changeTo;
    else return post;
});
console.log(newPost);

edited Aug 12, 2020 at 6:49

answered Aug 12, 2020 at 6:37

Giovanni Esposito

11.3k1 gold badge19 silver badges33 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

KarelG Over a year ago

Huh, "you cannot change allPost content"? Using the const keyword does not make the array immutable. You need to reword that phrase a bit.

Giovanni Esposito Over a year ago

As simpler as better... anyway if you try on snippet to make the map directly in const allPost you will get an error "you cannot change a const"...

Collectives™ on Stack Overflow

How do I replace in a javascript array? [duplicate]

1 Answer 1

2 Comments

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Linked

Related