How to add multiple classes to a ReactJS Component

I am new to ReactJS and JSX and I am having a little problem with the code below.

I am trying to add multiple classes to the className attribute on each li:

<li key={index} className={activeClass, data.class, "main-class"}></li>

My React component is:

var AccountMainMenu = React.createClass({
  getInitialState: function() {
    return { focused: 0 };
  },

  clicked: function(index) {
    this.setState({ focused: index });
  },

  render: function() {
    var self = this;
    var accountMenuData = [
      {
        name: "My Account",
        icon: "icon-account"
      },
      {
        name: "Messages",
        icon: "icon-message"
      },
      {
        name: "Settings",
        icon: "icon-settings"
      }
    /*{
        name:"Help &amp; Support &nbsp; <span class='font-awesome icon-support'></span>(888) 664.6261",
        listClass:"no-mobile last help-support last"
      }*/
    ];

    return (
      <div className="acc-header-wrapper clearfix">
        <ul className="acc-btns-container">
          {accountMenuData.map(function(data, index) {
            var activeClass = "";

            if (self.state.focused == index) {
              activeClass = "active";
            }

            return (
              <li
                key={index}
                className={activeClass}
                onClick={self.clicked.bind(self, index)}
              >
                <a href="#" className={data.icon}>
                  {data.name}
                </a>
              </li>
            );
          })}
        </ul>
      </div>
    );
  }
});

ReactDOM.render(<AccountMainMenu />, document.getElementById("app-container"));

Answer

I use classnames when there is a fair amount of logic required for deciding the classes to (not) use. An overly simple example:

...
    var liClasses = classNames({
      'main-class': true,
      'activeClass': self.state.focused === index
    });

    return (<li className={liClasses}>{data.name}</li>);
...

That said, if you don’t want to include a dependency then there are better answers below.

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