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// toggle complete tasks
$('.task-list li[data-status]').on('click', function (e) {
    e.preventDefault();

    // the target item must be marked as completed
    if ($(e.target).attr('data-status') === '0') {
        $(e.target).attr('data-status', 2);
    } else {
        $(e.target).attr('data-status', 0);
    }
});

// remove completed tasks
$('.remove-completed').on('click', function (e) {
    e.preventDefault();

    // find all items with an attribute of data-status that equals 2 and remove them
    $('.task-list li[data-status="2"]').remove();
});