Hi Yu,
This is a pretty dense (and IMHO non-idiomatic) piece of Clojure code.
Without reading the paste you provided, I can at least tell you what
appears to be happening here, given Clojure's evaluation semantics:
1. The [move ...] expression creates a vector of three functions.
2. The [(if ...)] expression creates a vector of three values (presumably
numeric) resulting from calls to the ranks function.
3. The (wrand ...) form calls wrand on the ranks vector to presumably
produce an integer index into the [move ...] vector.
4. The [move ...] vector is called on wrand's result, which should return
one of the three functions it contains.
5. The function returned from step 4 is called on loc.
Happy hacking,
~Gary
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