Concepts / Language Features
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Agents
Vars
state identity lifetime
Metadata
Tuples - syntax
Pattern Matching
immutability/side effects
memoization
trampolining
reflection
Java interop
Protocols
Deftypes
DefRecords
Pre and Post conditions of functions

Particular Functions
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vector-of
flatten
frequencies
group-by
keep
keep-indexed
map-indexed
partition-all
partition-by
rand-nth
reductions
constantly
repeatedly
shuffle