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5429 :: More elegant way to "invert" a table (hash map, dictionary)

• pmags (orginal) [2019-10-31T03:14:48+01:00] view original

  If I've got a table for which I know (by construction) the keys and values are unique, is there a more elegant way to "invert" the table than below?

  import tables, sequtils
  
  var int2str = {0: "Zero", 1: "One", 2: "Two", 3: "Three"}.toTable
  var str2int = newTable(zip(toSeq(int2str.values), toSeq(int2str.keys)))
  
  Run

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• mashingan (orginal) [2019-10-31T03:30:24+01:00] view original

  Dunno if more elegant or not, but you can try using mapIt

  import tables, sequtils
  
  var int2str = {0: "Zero", 1: "One", 2: "Two", 3: "Three"}.toTable
  var str2int = toSeq(int2str.pairs).mapIt((it[1], it[0])).toTable
  Run

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