Prevent encountering the error message "Cannot read property of undefined" while mapping data

When I retrieve data from the Google Books API, I need to transform it into a more manageable array for further processing. To achieve this, I am using the following code snippet:

data.items.map(function(book) {
  return { googleId : book.id, image : book.volumeInfo.imageLinks.thumbnail, authors : reduceAuthors(book.volumeInfo.authors), title : book.volumeInfo.title, subtitle : book.volumeInfo.subtitle, publishedDate : book.volumeInfo.publishedDate, publisher : book.volumeInfo.publisher}
});

While this method usually works well, sometimes it encounters an issue where a particular element like imagelinks or authors is missing, resulting in the error message:

"Uncaught TypeError: Cannot read property of undefined"
.

How can I prevent this error from occurring?

My current approach involves checking the entire data structure for completeness before applying the map function. However, I'm wondering if there's a better solution that doesn't prematurely exit the mapping process when using try and catch blocks.

Answer №1

To efficiently check for the thumbnail inside the map() function, you can use a ternary conditional like this:

 image : ((book.volumeInfo.imageLinks) ? book.volumeInfo.imageLinks.thumbnail : undefined)

This way, if book.volumeInfo.imageLinks is null/empty/undefined, there won't be an error and the value inserted will be undefined. Otherwise, it will catch the thumbnail value.

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