Nodes for the term “fold”

Scala: Idiomatic processing of an Option

Scala List class: methods, examples, and syntax

Scala Array class: methods, examples, and syntax

Scala Vector class: method examples and syntax

Scala Seq class: methods, examples, and syntax

Methods on the Scala collections classes, organized by category

Scala immutable Map class: methods, examples, and syntax

Kotlin collections methods: examples and syntax

How to use variable names with the Scala ‘foldLeft’ method

Scala: A “sum of the squares” algorithm using map/sum and foldLeft

A Scala ‘foldLeft’ function written using recursion

A tutorial on the universality and expressiveness of ‘fold’

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