Assertion: sequence's function | /r/CapableOf | return the value
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Source sentences:
text: In particular, Clojure allows contexts where one considers keywords (things) as functions (to look up values in maps) or where one interpretes maps (things) as functions, or shorthand for functions (which take a key and return the value associated to that key in the map)
text: -- a function lock the row,increament it, return the increamented_value - 1 then release the lock and return the value