Viewing github.com/facebook/react/fixtures/dom/src/components/IssueList.js

```
const React = window.React;
```
```
function csv(string) {
```
```
  return string.split(/\s*,\s*/);
```
```
}
```

export default function IssueList({issues}) {

```
  if (!issues) {
```
```
    return null;
```
```
  }
```
```
  if (typeof issues === 'string') {
```
```
    issues = csv(issues);
```
```
  }
```

  let links = issues.reduce((memo, issue, i) => {

```
    return memo.concat(
```

      i > 0 && i < issues.length ? ', ' : null,

      <a href={'https://github.com/facebook/react/issues/' + issue} key={issue}>

```
        {issue}
```
```
      </a>
```
```
    );
```
```
  }, []);
```
```
  return <span>{links}</span>;
```
```
}
```

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