Scala fold, foldLeft, and foldRight (Example) - Coderwall
coderwall.com › p › 4l73-aNov 25, 2022 · In essence, fold takes data in one format and gives it back to you in another. All three methods—fold, foldLeft, and foldRight—do the same thing, but just a little differently. I will first explain the concept all three share and then explain their differences. By the way, if you are coming from Ruby, like me, this is the same idea as inject.