// this will trigger our onChange callback
                            </div>
                            <div class="code-block">
                                vector.<span class="code-property">x</span> = <span class="code-number">1</span><span class="code-var">;</span>
                            </div>
                            <div class="code-comment">
                                // be careful, this will trigger onChange again!
                            </div>
                            <di