Nim: [json] Add `pairs` iterator for `JArray`

[kaushalmodi]

Currently pairs iter works only for JsonNode objects of JObject type, not to JArray type.

See my comments here.

Proposal

Add pairs iter for JArray too:

iterator pairs*(node: JsonNode): tuple[idx: int, val: JsonNode] =
  ## Iterator for the child elements of `node`. `node` has to be a JArray.
  assert node.kind == JArray
  var idx = 0
  for elem in items(node.elems):
    yield (idx, elem)
    idx += 1

.. and probably mpairs too?

[Araq]

Every pairs that doesn't yield (key, value) pairs but is just a workaround for the missing sugar.enumerate needs to die.

[dom96]

Every pairs that doesn't yield (key, value) pairs but is just a workaround for the missing sugar.enumerate needs to die.

So this can be closed then?

[Araq]

Well others may disagree and sugar.enumerate is missing.

[xflywind]

This issue can be closed with latest devel version

import json
import std/enumerate


let jsonNode = parseJson"""[1, 2, 3, 4]"""
doAssert jsonNode.kind == JArray
for idx, value in enumerate(jsonNode):
  echo $idx & " -> " & $value

0 -> 1
1 -> 2
2 -> 3
3 -> 4

[kaushalmodi]

@xflywind Thanks.