Concepts / Language Features
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Destructuring
Refs
Agents
Atoms
Vars
state identity lifetime
lazy sequences
Metadata
Tuples - syntax
Pattern Matching
immutability/side effects
memoization
recursive list processing
trampolining
reflection
Java interop
Protocols
Datatypes
Records
Types
Macros
Pre and Post conditions of functions

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