A lens represents a readable and "settable" location in a possibly nested immutable object. Lenses aren't in the Scala standard library, but several libraries provide them, including Scalaz and Shapeless. I'll show how you to use the Shapeless version, and we'll look at how it's implemented. This may interest you if: ...you use immutable objects ...you use nested immutable objects ...you want to abstract over different fields in your immutable objects ...you're interested in functional programming This is an informal, introductory talk, suitable for newcomers to Scala and newcomers to functional programming.

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