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Nathan Marz 2015-09-12 13:27:14 -04:00
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Most of Clojure programming involves creating, manipulating, and transforming immutable values. However, as soon as your values become more complicated than a simple map or list – like a list of maps of maps – transforming these data structures becomes extremely cumbersome.
Specter is a library (for both Clojure and ClojureScript) for doing these queries and transformations extremely concisely and elegantly. One way to think of it is "get-in" and "assoc-in" on steroids, though Specter works on any data structure, not just maps. It is similar to the concept of a "lens" in functional programming, though it has some important extensions.
Specter is a library (for both Clojure and ClojureScript) for doing these queries and transformations extremely concisely and elegantly. These kinds of manipulations are so common when using Clojure – and so cumbersome without Specter – that Specter is in many ways Clojure's missing piece.
Specter is fully extensible. At its core, its just a protocol for how to navigate within a data structure. By extending this protocol, you can use Specter to navigate any data structure or object you have.