Javascript ES6/ES5 find in array and change

javascript arrays ecmascript-6 lodash

user3712353 · Feb 4, 2016 · Viewed 190.3k times · Source

I have an array of objects. I want to find by some field, and then to change it:

var item = {...}
var items = [{id:2}, {id:2}, {id:2}];

var foundItem = items.find(x => x.id == item.id);
foundItem = item;

I want it to change the original object. How? (I dont care if it will be in lodash too)

Answer

You can use findIndex to find the index in the array of the object and replace it as required:

var item = {...}
var items = [{id:2}, {id:2}, {id:2}];

var foundIndex = items.findIndex(x => x.id == item.id);
items[foundIndex] = item;

This assumes unique IDs. If your IDs are duplicated (as in your example), it's probably better if you use forEach:

items.forEach((element, index) => {
    if(element.id === item.id) {
        items[index] = item;
    }
});