title: How to fix Error: "item' is not defined..."
body: <p>Its suppose return component that realize dropdown list by getting array of strings. Its probably some mistake how use elements of array.</p>
  
  <pre><code>import React from 'react'
  
  class DropDownList extends React.Component {
    renderDropDownList = () =&gt; {
      const { dropDownDownData } = this.props
      return (
         &lt;div className="book-shelf-changer"&gt;
         &lt;select&gt;
            dropDownDownData.map(function(item){
              &lt;option key = {item} value={item}&gt;{item}&lt;/option&gt;
            })
          &lt;/select&gt;
        &lt;/div&gt;
      )
  
    }
    render() {
      const optionList  = ['Move to...','Currently Reading','Want to Read','Read','None']
      return this.renderDropDownList(optionList)
    }
  }
  
  export  { DropDownList }
  </code></pre>