{"id":10594,"date":"2022-09-24T07:05:38","date_gmt":"2022-09-24T01:35:38","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-sorting-by-the-elements-that-come-first-in-the-array\/"},"modified":"2022-09-24T07:05:38","modified_gmt":"2022-09-24T01:35:38","slug":"solved-sorting-by-the-elements-that-come-first-in-the-array","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-sorting-by-the-elements-that-come-first-in-the-array\/","title":{"rendered":"[Solved] Sorting by the elements that come first in the array"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-51355861\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"51355861\" data-parentid=\"51355692\" 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 could use <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/Array\/sort#Sorting_with_map\">sorting with map<\/a> by using a temporary object with a hashtable for the same group counter.<\/p>\n<p>The sorting happens with the group.<\/p>\n<p>The result is mapped with index of the sorted temporary array. <\/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>var array = ['H', 'A', 'H', 'A'],\r\n    groups = Object.create(null),\r\n    counter = 0,\r\n    result = array\r\n        .map((v, index) =&gt; ({ index, group: groups[v] = groups[v] || ++counter }))\r\n        .sort((a, b) =&gt; a.group - b.group)\r\n        .map(o =&gt; array[o.index]);\r\n\r\nconsole.log(result);<\/code><\/pre>\n<\/div>\n<\/div>\n<p>The same, but with a <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/Map\"><code>Map<\/code><\/a> for the order of the first occurence.<\/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>var array = ['H', 'A', 'H', 'A'],\r\n    map = new Map;\r\n\r\narray.forEach(v =&gt; map.has(v) || map.set(v, map.size + 1));\r\n\r\narray.sort((a, b) =&gt; map.get(a) - map.get(b));\r\n\r\nconsole.log(array);<\/code><\/pre>\n<\/div>\n<\/div><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\"><\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Sorting by the elements that come first in the array <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] You could use sorting with map by using a temporary object with a hashtable for the same group counter. The sorting happens with the group. The result is mapped with index of the sorted temporary array. var array = [&#8216;H&#8217;, &#8216;A&#8217;, &#8216;H&#8217;, &#8216;A&#8217;], groups = Object.create(null), counter = 0, result = array .map((v, index) &#8230; <a title=\"[Solved] Sorting by the elements that come first in the array\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-sorting-by-the-elements-that-come-first-in-the-array\/\" aria-label=\"More on [Solved] Sorting by the elements that come first in the array\">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":[361,333,561],"class_list":["post-10594","post","type-post","status-publish","format-standard","hentry","category-solved","tag-arrays","tag-javascript","tag-sorting"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Sorting by the elements that come first in the array - 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-sorting-by-the-elements-that-come-first-in-the-array\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Sorting by the elements that come first in the array - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] You could use sorting with map by using a temporary object with a hashtable for the same group counter. The sorting happens with the group. The result is mapped with index of the sorted temporary array. var array = [&#039;H&#039;, &#039;A&#039;, &#039;H&#039;, &#039;A&#039;], groups = Object.create(null), counter = 0, result = array .map((v, index) ... 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The sorting happens with the group. The result is mapped with index of the sorted temporary array. var array = ['H', 'A', 'H', 'A'], groups = Object.create(null), counter = 0, result = array .map((v, index) ... 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