Get arbitrarily deeply nested objects with a comparator.

get-deep-objects.js

/**
 * Get deeply nested objects using a 'compare' function.
 *
 * @param  {(object|array)} target  Data tree in which to find objects.
 * @param  {function}       compare Passed items in the `target` data tree. It
 *                                  should return a boolean value based on the
 *                                  item.
 * @return {array}
 */
function getDeepObjects(target, compare) {
    var found = [];

    if (Array.isArray(target)) {
        target.forEach(function(childTarget) {
            [].push.apply(found, findDeep(childTarget, compare));
        });
    } else if (target instanceof Object) {
        if (compare(target)) {
            found.push(target);
        } else {
            Object.keys(target).forEach(function(key) {
                [].push.apply(found, findDeep(target[key], compare));
            });
        }
    }

    return found;
}