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+### DataList
+
+Renders a list of elements from an array of primitives.
+
+Use the value of the `isOrdered` prop to conditionally render a `<ol>` or `<ul>` list.
+Use `Array.prototype.map` to render every item in `data` as a `<li>` element, give it a `key` produced from the concatenation of the its index and value.
+Omit the `isOrdered` prop to render a `<ul>` list by default.
+
+```jsx
+function DataList({ isOrdered, data }) {
+  const list = data.map((val, i) => (
+    <li key={`${i}_${val}`}>{val}</li>
+  ));
+  return isOrdered ? <ol>{list}</ol> : <ul>{list}</ul>;
+}
+```
+
+```jsx
+const names = ['John', 'Paul', 'Mary'];
+ReactDOM.render(<DataList data={names}/>, document.getElementById('root'));
+ReactDOM.render(<DataList data={names} isOrdered/>, document.getElementById('root'));
+```
+
+<!-- tags: array,functional -->
+
+<!-- expertise: 0 -->