27 lines
838 B
Markdown
27 lines
838 B
Markdown
### DataList
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Renders a list of elements from an array of primitives.
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Use the value of the `isOrdered` prop to conditionally render a `<ol>` or `<ul>` list.
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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.
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Omit the `isOrdered` prop to render a `<ul>` list by default.
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```jsx
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function DataList({ isOrdered, data }) {
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const list = data.map((val, i) => (
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<li key={`${i}_${val}`}>{val}</li>
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));
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return isOrdered ? <ol>{list}</ol> : <ul>{list}</ul>;
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}
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```
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```jsx
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const names = ['John', 'Paul', 'Mary'];
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ReactDOM.render(<DataList data={names}/>, document.getElementById('root'));
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ReactDOM.render(<DataList data={names} isOrdered/>, document.getElementById('root'));
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```
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<!-- tags: array,functional -->
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<!-- expertise: 0 -->
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