Create object with key => value in javascript

Im’ trying to create an object in a loop which contain key => [value], if key exist, add the value.

I tried like this :

let dataName = [];
let obj = {};

checkboxes.forEach(checkbox => {
        if (checkbox.checked) {
            obj[name] = [checkbox.id]
            dataName.push(obj);
        }
    });

And when I click the value is override instead being added. How to add value by keys when the checkbox is checked ?

>Solution :

You need to create a new object for each iteration

checkboxes.forEach(checkbox => {
        if (checkbox.checked) {
            let obj = {};
            obj[name] = [checkbox.id]
            dataName.push(obj);
        }
    });

Also, if obj[name] is not working, try obj[checkbox.getAttribute("name")] = ...;

Also, you can select only checked checkboxes using

document.querySelectorAll("input:checked");