Exploring nested JSON through recursive iteration in JavaScript

Consider this JSON data containing comments that are fetched via AJAX call: 

json = 'comments': [ 
  {'id':1,'parent':0},
  {'id':2,'parent':1},
  {'id':3,'parent':2},
  {'id':4,'parent':0}]

In order to display them properly, they need to be structured as shown below:

target_object= comments: [ 
      {id:1,parent:0, children:[
        {id:2,parent:1, children: [
          {id:3,parent:2}]}]},
      {id:4,parent:0, children:[]}]

Query:

  1. What is the most effective method to achieve this structure? (Preferably using CoffeScript iterators, but JQuery/pure JS solutions are also acceptable).
javascriptjsoncoffeescriptiteratornested

Answer №1

After dedicating some time to it, I was able to resolve the issue:

target = []

recurs = (id,json,form, single = []) ->
  for com in json.comments
    if com.parent is id
      single.push com
      if !single[single.length - 1].children?
        single[single.length - 1].children = []
      shingle = single[single.length - 1].children
      recurs(com.id,json,form, shingle)
  target[0] = single if !target[1]?
  return
recurs(0, json, target)

If anyone has suggestions for improving or repurposing the code, please feel free to share! EDIT For those interested, here is a script that can be used to format comments using the method described above:

    target = $('.comments')   
recurs = (id,json,form) ->
  for com in json.comments
    if com.parent is id
      form.append($("<div class='well'>#{com.id}</div>"))
      if !form.children('.well:last-child').children('.children:last-child').length
        form.children('.well:last-child').append('<div class="children"></div>')
      shingle = form.children('.well:last-child').children('.children')
      recurs(com.id,json,shingle)
  return
recurs(0, json, target)

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