查找和更新数组中的对象

Question

I want to get an object from an array of objects, then update it.

var myObjs = [{ id: 1, name: "foo"}, { id: 2, name: "bar" }];

var myObjectToUpdate = _.findWhere(myObjs, { id: 2 });

myObjectToUpdate = { id: 2, name: "boop" };

myObjs[1] // { id: 2, name: "boop" }

Currently when I update myObject in the 3rd line, it does not update the array of objects. I'm assuming it is updating the new variable instead of referencing.

What is the correct way to do this?

Answer 1

@E_net4 is correct, you are reassigning the object you just found.

If all you need to do is update the name, try this:

var myObjs = [{ id: 1, name: "foo"}, { id: 2, name: "bar" }];

var myObjectToUpdate = _.findWhere(myObjs, { id: 2 });

myObjectToUpdate.name = "boop";

myObjs[1] // { id: 2, name: "boop" }

Answer 2

I guess this is what you want. You have, in your code, misconceptions. Please read my code and compare both.

Hope it helps!

function fn(arr, toReplace, newValue) {
  for(var x in arr) {
    for(var k in toReplace) {
      if(arr[x][k] == toReplace[k]) {
        arr[x] = newValue;
      }
    }
  }
  return arr;
};

var arr = [{ id: 1, name: "foo"}, { id: 2, name: "bar" }];
var newValue = {id: 2, name: "boop"};

arr = fn(arr, {id: 2}, newValue);
console.log(arr);