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819 :: Appending to an array stored in a hash table

• immortal (orginal) [2015-02-01T22:59:07+01:00] view original

  Does nim support this? Here is an example in python. (Python dictionaries are hash tables)

  
  array = []
  dict = {}
  dict['key'] = array
  dict['key'].append("Test")
  dict['key'].append("Test 2")
  print dict['key']
  
  Result: ['Test', 'Test 2']
  Run

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• def (orginal) [2015-02-01T23:09:49+01:00] view original

  import tables
  
  var dict = initTable[string, seq[string]]()
  dict["key"] = @[]
  dict.mget("key").add("Test")
  dict.mget("key").add("Test 2")
  echo dict["key"]
  Run

  I think we should replace the mget("key") with ["key"], but this causes ambiguity in the compiler so far because we can't do overloading based on return type.

  Edit: Also, while we're at emulating Python's hash tables, this syntax works in Nim as well:

  import tables
  
  # These are both the same in Nim, an array of tuples:
  let list1 = {"key": 12, "key2": 13}
  let list2 = [("key", 12), ("key2", 13)]
  
  # A dictionary from them:
  var dict1 = list1.toTable
  var dict2 = list2.toTable
  
  # Or directly:
  var dict3 = toTable({"key": 12, "key2": 13})
  Run

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• immortal (orginal) [2015-02-02T00:11:56+01:00] view original

  Oh wow thanks. The first example works well for what I need.

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