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