{"id":34225,"date":"2023-03-03T09:17:09","date_gmt":"2023-03-03T03:47:09","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-modify-array-of-objects-javascript\/"},"modified":"2023-03-03T09:17:09","modified_gmt":"2023-03-03T03:47:09","slug":"solved-modify-array-of-objects-javascript","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-modify-array-of-objects-javascript\/","title":{"rendered":"[Solved] modify array of objects &#8211; javascript"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-57877980\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"57877980\" data-parentid=\"57877694\" 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>Aggregation like this be handled by <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/Array\/Reduce\"><code>Array.reduce()<\/code><\/a>. For example:<\/p>\n<\/p>\n<div class=\"snippet\" data-lang=\"js\" data-hide=\"false\" data-console=\"true\" data-babel=\"false\">\n<div class=\"snippet-code\">\n<pre class=\"snippet-code-js lang-js prettyprint-override\"><code>const arr = [\r\n  {KEY1: \"VALUE1\", NAME: \"VALUE2\", PID: \"VALUE36\"},\r\n  {KEY11: \"VALUE1\", NAME: \"VALUE2\", PID: \"VALUE47\"},\r\n  {KEY11: \"VALUE1\", NAME: \"VALUE4\", PID: \"VALUE49\"},\r\n  {KEY11: \"VALUE1\", NAME: \"VALUE4\", PID: \"VALUE43\"},\r\n]\r\n\r\n\/\/ Objects are basically associative arrays in JS, so...\r\n\/\/ (For each item in arr, add or update an array at obj[item.NAME])\r\nconst obj = arr.reduce((obj, item) =&gt; {\r\n  const val = [ item.PID ]\r\n  obj[item.NAME] = Array.isArray(obj[item.NAME])\r\n    ? obj[item.NAME].concat(val)\r\n    : val\r\n  return obj\r\n}, {}) \/\/ start with obj = {}\r\n\r\n\/*\r\nAt this point, we have\r\nobj = {\r\n  \"VALUE2\": [\r\n    \"VALUE36\",\r\n    \"VALUE47\"\r\n  ],\r\n  \"VALUE4\": [\r\n    \"VALUE49\",\r\n    \"VALUE43\"\r\n  ]\r\n}\r\n*\/\r\n\r\n\/\/ ...but since you specified separate objects, this finishes it off\r\nconst newArr = Object.entries(obj).map(([key, val]) =&gt; ({ [key]: val }))\r\nconsole.log(newArr)<\/code><\/pre>\n<\/div>\n<\/div><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">1<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved modify array of objects &#8211; javascript <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] Aggregation like this be handled by Array.reduce(). For example: const arr = [ {KEY1: &#8220;VALUE1&#8221;, NAME: &#8220;VALUE2&#8221;, PID: &#8220;VALUE36&#8221;}, {KEY11: &#8220;VALUE1&#8221;, NAME: &#8220;VALUE2&#8221;, PID: &#8220;VALUE47&#8221;}, {KEY11: &#8220;VALUE1&#8221;, NAME: &#8220;VALUE4&#8221;, PID: &#8220;VALUE49&#8221;}, {KEY11: &#8220;VALUE1&#8221;, NAME: &#8220;VALUE4&#8221;, PID: &#8220;VALUE43&#8221;}, ] \/\/ Objects are basically associative arrays in JS, so&#8230; \/\/ (For each item in arr, add &#8230; <a title=\"[Solved] modify array of objects &#8211; javascript\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-modify-array-of-objects-javascript\/\" aria-label=\"More on [Solved] modify array of objects &#8211; javascript\">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],"class_list":["post-34225","post","type-post","status-publish","format-standard","hentry","category-solved","tag-javascript"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] modify array of objects - javascript - 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-modify-array-of-objects-javascript\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] modify array of objects - javascript - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] Aggregation like this be handled by Array.reduce(). For example: const arr = [ {KEY1: &quot;VALUE1&quot;, NAME: &quot;VALUE2&quot;, PID: &quot;VALUE36&quot;}, {KEY11: &quot;VALUE1&quot;, NAME: &quot;VALUE2&quot;, PID: &quot;VALUE47&quot;}, {KEY11: &quot;VALUE1&quot;, NAME: &quot;VALUE4&quot;, PID: &quot;VALUE49&quot;}, {KEY11: &quot;VALUE1&quot;, NAME: &quot;VALUE4&quot;, PID: &quot;VALUE43&quot;}, ] \/\/ Objects are basically associative arrays in JS, so... \/\/ (For each item in arr, add ... 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For example: const arr = [ {KEY1: \"VALUE1\", NAME: \"VALUE2\", PID: \"VALUE36\"}, {KEY11: \"VALUE1\", NAME: \"VALUE2\", PID: \"VALUE47\"}, {KEY11: \"VALUE1\", NAME: \"VALUE4\", PID: \"VALUE49\"}, {KEY11: \"VALUE1\", NAME: \"VALUE4\", PID: \"VALUE43\"}, ] \/\/ Objects are basically associative arrays in JS, so... \/\/ (For each item in arr, add ... 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