Check if element contains any of the class from array

Question

I have the following elements:

Answer 1

How do I check if any of these elements has one of the classes in the array

You'd have to iterate over elements and classes, and check if each element contain any of the classes in the array, something like this

var elements = $('div');
var obj      = ['nine', 'ten', 'eleven'];

var hasClass = elements.filter(function(index, elem) {
    return obj.some(function(klass) {
        return elem.classList.contains(klass);
    });
}).length > 0;

You could easily make that into a function

function hasClass(elements, classes) {
    return elements.filter(function(index, elem) {
        return classes.some(function(klass) {
            return elem.classList.contains(klass);
        });
    }).length > 0;
}

FIDDLE

Using Array.some and Element.classList.contains to avoid uneccessary iteration and slow matching of classnames.