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import tables
doAssert indexBy(newSeq[int](), proc(x: int):int = x) == initTable[int, int](), "empty int table"
var tbl1 = initTable[int, int]()
tbl1.add(1,1)
tbl1.add(2,2)
doAssert indexBy(@[1,2], proc(x: int):int = x) == tbl1, "int table"
type
TElem = object
foo: int
bar: string
let
elem1 = TElem(foo: 1, bar: "bar")
elem2 = TElem(foo: 2, bar: "baz")
var tbl2 = initTable[string, TElem]()
tbl2.add("bar", elem1)
tbl2.add("baz", elem2)
doAssert indexBy(@[elem1,elem2], proc(x: TElem): string = x.bar) == tbl2, "element table"
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