JSFiddle - React, Tailwind, and code Playground

HTML

<label>
    <input type="checkbox" data="1"><span>Air Conditioning</span>

</label>
<label>
    <input type="checkbox" data="wes"><span>Cable TV Service</span>

</label>
<label>
    <input type="checkbox" data="3"><span>Private Bathroom</span>

</label>

JavaScript

var room_features = "";

$('[type=checkbox]').change(function () {
    var data = "-" + $(this).attr('data');
    if (room_features.indexOf(data) != -1) {
        room_features = room_features.replace(data, "");
        alert(room_features);
    } else {
        room_features = room_features + data;
        alert(room_features);
    }
})