{"id":13226,"date":"2022-10-03T10:24:34","date_gmt":"2022-10-03T04:54:34","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-how-to-build-a-tree-from-a-plain-data-structure\/"},"modified":"2022-10-03T10:24:34","modified_gmt":"2022-10-03T04:54:34","slug":"solved-how-to-build-a-tree-from-a-plain-data-structure","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-how-to-build-a-tree-from-a-plain-data-structure\/","title":{"rendered":"[Solved] How to build a tree from a plain data structure"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-30528201\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"30528201\" data-parentid=\"30527633\" data-score=\"0\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>I guess you&#8217;re looking to organize the whole array so items are children of some states. Run the following snippet to get a JSON-serialized result to check it (click show code snippet to see the code and run it!):<\/p>\n<\/p>\n<div class=\"snippet\" data-lang=\"js\" data-hide=\"true\">\n<div class=\"snippet-code snippet-currently-hidden\">\n<pre class=\"snippet-code-js lang-js prettyprint-override\"><code>var arr = [{\r\n  id: \"1\",\r\n  state: \"1\",\r\n  ndi: \"1558.3045298\",\r\n  children: \"null\"\r\n}, {\r\n  id: \"2\",\r\n  state: \"1\",\r\n  ndi: \"1684.0732025\",\r\n  children: \"null\"\r\n}, {\r\n  id: \"3\",\r\n  state: \"1\",\r\n  ndi: \"1809.8418752\",\r\n  children: \"null\"\r\n}, {\r\n  id: \"4\",\r\n  state: \"2\",\r\n  ndi: \"1915.1603572\",\r\n  children: \"null\"\r\n}, {\r\n  id: \"5\",\r\n  state: \"2\",\r\n  ndi: \"2023.5463678\",\r\n  children: \"null\"\r\n}];\r\n\r\n\/\/ This is going to hold states by id\r\nvar states = {};\r\n\r\n\/\/ We iterate the array to get an organized by state children version\r\narr.forEach(function(item) {\r\n  \/\/ If state by id object hasn't the id yet we create an state object\r\n  \/\/ for current state id. There will be no duplicated states.\r\n  if (!states.hasOwnProperty(item.state)) {\r\n    states[item.state] = {\r\n      id: item.state,\r\n      children: []\r\n    };\r\n  }\r\n\r\n  \/\/ We add the item to the state by id object\r\n  states[item.state].children.push(item);\r\n\r\n\r\n  \/\/ This re-defines the state property to point to the \r\n  \/\/ item's parent state\r\n  item.state = states[item.state];\r\n\r\n  \/\/ We drop this property from the item because it's\r\n  \/\/ disturbing the new organized tree ;)\r\n  delete item.children;\r\n});\r\n\r\nvar alreadySerialized = [];\r\n\r\n\/\/ The second argument is required to avoid cyclic object\r\n\/\/ serialization.\r\n\/\/ Learn more here: https:\/\/developer.mozilla.org\/en\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/JSON\/stringify\r\ndocument.getElementById(\"result\").textContent = JSON.stringify(states, function(key, val) {\r\n  if (val != null &amp;&amp; typeof val == \"object\") {\r\n    if (alreadySerialized.indexOf(val) &gt;= 0) {\r\n      return;\r\n    }\r\n    alreadySerialized.push(val);\r\n  }\r\n  return val;\r\n});<\/code><\/pre>\n<pre class=\"snippet-code-html lang-html prettyprint-override\"><code>&lt;div id=\"result\"&gt;&lt;\/div&gt;<\/code><\/pre>\n<\/div>\n<\/div>\n<p>Here&#8217;s a sample resulting data after the transformation:<\/p>\n<pre><code>{\n   \"1\":{\n      \"id\":\"1\",\n      \"children\":[\n         {\n            \"id\":\"1\",\n            \"ndi\":\"1558.3045298\"\n         },\n         {\n            \"id\":\"2\",\n            \"ndi\":\"1684.0732025\"\n         },\n         {\n            \"id\":\"3\",\n            \"ndi\":\"1809.8418752\"\n         }\n      ]\n   },\n   \"2\":{\n      \"id\":\"2\",\n      \"children\":[\n         {\n            \"id\":\"4\",\n            \"ndi\":\"1915.1603572\"\n         },\n         {\n            \"id\":\"5\",\n            \"ndi\":\"2023.5463678\"\n         }\n      ]\n   }\n}\n<\/code><\/pre>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">4<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved How to build a tree from a plain data structure <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] I guess you&#8217;re looking to organize the whole array so items are children of some states. Run the following snippet to get a JSON-serialized result to check it (click show code snippet to see the code and run it!): var arr = [{ id: &#8220;1&#8221;, state: &#8220;1&#8221;, ndi: &#8220;1558.3045298&#8221;, children: &#8220;null&#8221; }, { id: &#8230; <a title=\"[Solved] How to build a tree from a plain data structure\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-how-to-build-a-tree-from-a-plain-data-structure\/\" aria-label=\"More on [Solved] How to build a tree from a plain data structure\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[333,494,1381],"class_list":["post-13226","post","type-post","status-publish","format-standard","hentry","category-solved","tag-javascript","tag-recursion","tag-tree"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] How to build a tree from a plain data structure - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-how-to-build-a-tree-from-a-plain-data-structure\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] How to build a tree from a plain data structure - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] I guess you&#8217;re looking to organize the whole array so items are children of some states. Run the following snippet to get a JSON-serialized result to check it (click show code snippet to see the code and run it!): var arr = [{ id: &quot;1&quot;, state: &quot;1&quot;, ndi: &quot;1558.3045298&quot;, children: &quot;null&quot; }, { id: ... 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Run the following snippet to get a JSON-serialized result to check it (click show code snippet to see the code and run it!): var arr = [{ id: \"1\", state: \"1\", ndi: \"1558.3045298\", children: \"null\" }, { id: ... 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