I am building a javascript function where I want to add an object to an array IF it is not already present, if it is I just want to update value.
My objects look like this:
[{31652237148248: 12}, {4365124714824: 4}]
How can I check the Array if there is an object with the ID of 31652237148248?
I tried this but it did not work:
var index = cartItems.findIndex((obj => obj[id] == id));
Use the in operator to check if the id is a property of the object:
const cartItems = [{31652237148248: 12}, {4365124714824: 4}];
const id = '4365124714824';
const index = cartItems.findIndex((obj => id in obj));
console.log(index);
You are looking to see if the value of objects property is equal to the id. 31652237148248 is never going to equal 12
so you can just do a type of
var index = cartItems.findIndex(obj => typeof obj[id] !== undefined);
you can do a truthy check - will fail if it is a falsey value.
var index = cartItems.findIndex(obj => obj[id]);
you can use object keys and includes or if first is equal
var index = cartItems.findIndex(obj => Object.keys(obj).includes(id));
var index = cartItems.findIndex(obj => Object.keys(obj)[0] === id);
A bunch of ways to do it
Personally a better way is just to use an object and not an array for the data.
var items = {31652237148248: 12, 4365124714824: 4}
const addItem = (id, count) => {
cartItems[id] = (cartItems[id] || 0) + count
}
const getArray = () =>
Object.entries(items).map(([key, count]) => ({ [key]: count }))
Try
let add = (obj,arr,k=Object.keys(obj)[0]) =>
arr.some( o=> (k in o)&&(o[k]=obj[k]) ) || arr.push(obj)
let data = [{31652237148248: 12}, {4365124714824: 4}]
let add = (obj,arr,k=Object.keys(obj)[0]) =>
arr.some( o=> (k in o)&&(o[k]=obj[k]) ) || arr.push(obj)
// TEST
add({31652237148248: 15}, data);
console.log('update',data);
add({666: 15}, data);
console.log('add',data);