32 lines
983 B
Markdown
32 lines
983 B
Markdown
### MappedList
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Renders a list of elements from an array of data.
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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 and give it a `key`.
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`data` can either be an array of objects with the `id` and `value` properties or an array of primitives.
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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 MappedList({ isOrdered, data }) {
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const list = data.map((v, i) => (
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<li key={v.id ? v.id : i}>{v.value ? v.value : v}</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(<MappedList data={names}/>, document.getElementById('root'));
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const users = [ { id: 8, value: 'john' }, { id: 3, value: 'paul' }];
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ReactDOM.render(
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<MappedList data={users} isOrdered />,
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document.getElementById('root')
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);
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```
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<!-- tags: array,functional -->
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<!-- expertise: 1 -->
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