Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

iOS Closures in Swift Building Standard Library Functions Flat Map

flatMap deprecated (Swift 4.2) ?

Hi, what would be the function to achieve the same result as the one obtained with flatMap ? i.e.: flattening an array of arrays to an array ?

1 Answer

Rogier Nitschelm
seal-mask
.a{fill-rule:evenodd;}techdegree
Rogier Nitschelm
iOS Development Techdegree Student 5,461 Points

In Swift there were a few use-cases for using flatMap. Removing nil-values from an array. And flattening an array of arrays for example.

Removing nil-values with flatMap is being deprecated. Instead you can use .compactMap for that. You can still use flatMap to flatten an array of arrays.