I want to only display the following components if their href property exists:

```
 <ExternalLinks href={source}>Code</ExternalLinks>
 <ExternalLinks href={download}>Download</ExternalLinks>
 <ExternalLinks href={visit}>Website</ExternalLinks>

```

Here is the array, for example if the download and visit properties don't exist for the array object then I don't want them to appear.

```
    title: '',
    description: "",
    image: '/images/ethereumcampaign.png',
    tags: ['React', 'Node.js', 'Solidity'],
    href: "/campaigns",
    //download: 'https://google.com',
    source: '',
    //visit: "",
    id: 0,

```

Thanks :)