{"id":17774,"date":"2022-10-27T02:02:43","date_gmt":"2022-10-26T20:32:43","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-how-to-merge-multiple-arrays-in-javascript-with-a-first-elements-closed\/"},"modified":"2022-10-27T02:02:43","modified_gmt":"2022-10-26T20:32:43","slug":"solved-how-to-merge-multiple-arrays-in-javascript-with-a-first-elements-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-how-to-merge-multiple-arrays-in-javascript-with-a-first-elements-closed\/","title":{"rendered":"[Solved] How to merge multiple arrays in JavaScript with a first elements [closed]"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-41516504\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"41516504\" data-parentid=\"41516456\" 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>You&#8217;re looking for the <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/Set\">Set<\/a> data structure.  Create a set with all the arrays you have and you&#8217;ll have the duplicates removed.<br \/>\nTo amend the other user&#8217;s answer:<\/p>\n<pre><code>\/\/ Have a single array to loop through.\nvar mainArray = [];\nmainArray.push([\"cat\", \"blue\", \"1\"]);\nmainArray.push([\"cat\", \"red\", \"1\"]);\nmainArray.push([\"cat\", \"yellow\", \"1\"]);\nmainArray.push([\"dog\", \"blue\", \"1\"]);\nmainArray.push([\"dog\", \"red\", \"1\"]);\n\n\/\/ Result Object.\nvar resultObject = {};\nfor (var i = 0; i &lt; mainArray.length; i++) {\n  if (!resultObject[mainArray[i][0]]) {\n    resultObject[mainArray[i][0]] = [];\n  }\n  resultObject[mainArray[i][0]] = resultObject[mainArray[i][0]].concat(mainArray[i]);\n\n}\n\n\n\n for (var key in resultObject) {\n  if (resultObject.hasOwnProperty(key)) {\n    resultObject[key] = new Set(resultObject[key])\n    resultObject[key] = Array.from(resultObject[key])\n  }\n}\nconsole.log(resultObject)\n<\/code><\/pre>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">3<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved How to merge multiple arrays in JavaScript with a first elements [closed] <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] You&#8217;re looking for the Set data structure. Create a set with all the arrays you have and you&#8217;ll have the duplicates removed. To amend the other user&#8217;s answer: \/\/ Have a single array to loop through. var mainArray = []; mainArray.push([&#8220;cat&#8221;, &#8220;blue&#8221;, &#8220;1&#8221;]); mainArray.push([&#8220;cat&#8221;, &#8220;red&#8221;, &#8220;1&#8221;]); mainArray.push([&#8220;cat&#8221;, &#8220;yellow&#8221;, &#8220;1&#8221;]); mainArray.push([&#8220;dog&#8221;, &#8220;blue&#8221;, &#8220;1&#8221;]); mainArray.push([&#8220;dog&#8221;, &#8220;red&#8221;, &#8230; <a title=\"[Solved] How to merge multiple arrays in JavaScript with a first elements [closed]\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-how-to-merge-multiple-arrays-in-javascript-with-a-first-elements-closed\/\" aria-label=\"More on [Solved] How to merge multiple arrays in JavaScript with a first elements [closed]\">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-17774","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] How to merge multiple arrays in JavaScript with a first elements [closed] - 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-merge-multiple-arrays-in-javascript-with-a-first-elements-closed\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] How to merge multiple arrays in JavaScript with a first elements [closed] - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] You&#8217;re looking for the Set data structure. Create a set with all the arrays you have and you&#8217;ll have the duplicates removed. To amend the other user&#8217;s answer: \/\/ Have a single array to loop through. var mainArray = []; mainArray.push([&quot;cat&quot;, &quot;blue&quot;, &quot;1&quot;]); mainArray.push([&quot;cat&quot;, &quot;red&quot;, &quot;1&quot;]); mainArray.push([&quot;cat&quot;, &quot;yellow&quot;, &quot;1&quot;]); mainArray.push([&quot;dog&quot;, &quot;blue&quot;, &quot;1&quot;]); mainArray.push([&quot;dog&quot;, &quot;red&quot;, ... 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Create a set with all the arrays you have and you&#8217;ll have the duplicates removed. To amend the other user&#8217;s answer: \/\/ Have a single array to loop through. var mainArray = []; mainArray.push([\"cat\", \"blue\", \"1\"]); mainArray.push([\"cat\", \"red\", \"1\"]); mainArray.push([\"cat\", \"yellow\", \"1\"]); mainArray.push([\"dog\", \"blue\", \"1\"]); mainArray.push([\"dog\", \"red\", ... 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