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Zippers are a feature.

A zipper is a technique of representing an aggregate data structure so that it is convenient for writing programs that traverse the structure arbitrarily and update its contents, especially in purely functional programming languages. The zipper was described by G茅rard Huet in 1997. It includes and generalizes the gap buffer technique sometimes used with arrays. Read more on Wikipedia...

Languages with Zippers include Haskell

Example from Haskell:
async-await-feature.html 路 zipper-feature.html 路 switch-statements-feature.html

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