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(import-macros {: reduce} :lib.macro)
(fn sort [a less-fn]
(table.sort a less-fn)
a)
(fn concat [a b]
(local copy
(fn [a b]
(reduce
(fn [_ v res]
(table.insert res v)
res)
b a)))
(copy a b))
(fn flip [a]
(collect [k v (pairs a)]
(values v k)))
(fn diff [a b]
(local flip-b (flip b))
(reduce
(fn [_ v res]
(when (not (. flip-b v))
(table.insert res v))
res)
a []))
(fn unique [a]
(var hash {})
(reduce
(fn [_ v res]
(when (not (. hash v))
(tset hash v true)
(table.insert res v))
res)
a []))
(fn flatten [a]
(reduce
(fn [_ value rest]
(concat
rest
(if (= (type value) "table")
(flatten value)
[value])))
a []))
(fn contains [a want]
(each [_ v (pairs a)]
(if (= v want)
(lua "return true")))
false)
(local join table.concat)
{: sort : concat : diff : unique : flatten : join : contains}
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