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Nathan Marz 2016-01-13 11:35:22 -05:00
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README.md
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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. 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 a library (for both Clojure and ClojureScript) for doing these queries and transformations concisely, elegantly, and efficiently. 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.
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(compiled-transform precompiled inc structure)
```
Depending on the details of the selector and the data being transformed, precompiling can sometimes provide more than a 10x speedup.
Depending on the details of the selector and the data being transformed, precompiling can sometimes provide more than a 10x speedup. Using Specter with precompilation generally gets the speed within a few percentage points of hand-optimized code.
You can even precompile selectors that require parameters! For example, `keypath` can be used to navigate into a map by any arbitrary key, such as numbers, strings, or your own types. One way to use `keypath` would be to parameterize it at the time you use it, like so:
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# Future work
- Integrate Specter with other kinds of data structures, such as graphs
- Integrate Specter with other kinds of data structures, such as graphs. Desired navigations include: reduction in topological order, navigate to outgoing/incoming nodes, to a subgraph (with metadata indicating how to attach external edges on transformation), to node attributes, to node values, to specific nodes.
- Make it possible to parallelize selects/transforms
- Any connection to transducers?