6

function orderedCollection() {
    const _elements = [];

    function add(element) {
        let indexToInsertIn = _elements.length;
        for (let index = _elements.length - 1; index >= -1; index--) {
            const current = _elements[index];

            if (index === -1  ||
                current <= element) {
                indexToInsertIn = index + 1;
                break;
            }
        }

        for (let index = _elements.length; index >= indexToInsertIn + 1; index--) {
            _elements[index] = _elements[index - 1];
        }

        _elements[indexToInsertIn] = element;

        _obj.size = _elements.length;
    }

    function remove(index) {
        for (let i = index; i < _elements.length - 1; i++) {
            _elements[i] = _elements[i + 1];
        }

        _elements.pop();

        _obj.size = _elements.length;
    }

    function get(index) {
        return _elements[index];
    }

    const _obj = {
        add,
        remove,
        get,
        size: 0
    };

    return _obj;
}