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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Why would you want a one-liner for this problem, or indeed for any other problem?
https://users.rust-lang.org/t/to-string-vs-to-owned-for-string-literals/1441/5
It looks like they have the same performance
Is that more efficient in Rust than using the multiplication operator? Or is it just cute but harder to understand?
Instructions state the function will be passed "an array of minimum 4 integers," so your additional code is unnecessary.