group.md

name	names	see	todo
group(callback, thisp?, equals?)	group(callback) group(callback, thisp) group(callback, thisp, equals)	reduce for-each map filter group	expand this documentation, significantly

Returns an array of [key, class] entries where every value from the collection is placed into the same equivalence class if they return the same key through the given callback.

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The given callback receives the value for each entry, the key or index, and the collection itself.