JAVASCRIPT

object exists in array javascript

array.findIndex((obj) => obj.id === obj.id) !== -1

how to check if object exists in array javascript

function containsObject(obj, list) {
    var i;
    for (i = 0; i < list.length; i++) {
        if (list[i] === obj) {
            return true;
        }
    }

    return false;
}