example.js

var imageUrls = [/* image urls here */];

// The basic prefetch and forget.
imageUrls.map((url) => Image.prefetch(url));

// ------------- OR -------------

// Prefetch and replace image urls that fail to load with a default image URL
// Note: You could/should bundle the default image with the app so it doesn't
// need prefetched, and would load instantly.

// Prefetch a default image (just one I found on google, i don't own the image)
const defaultImageUrl = 'http://xpenology.org/wp-content/themes/qaengine/img/default-thumbnail.jpg';
Image.prefetch(defaultImageUrl);

imageUrls.map((url, index) => {
  // If you used a bundled image instead, you could just set the URL to `null`
  // and check for that when rendering it, and display the default one instead.
  Image.prefetch(url).catch(e => imageUrls[index] = defaultImageUrl);
});

How about?)
imageUrls.map(Image.prefetch);