{"id":28560,"date":"2023-01-01T01:18:33","date_gmt":"2022-12-31T19:48:33","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-reduce-array-of-objects-to-x-number-of-items-trying-to-keep-at-least-2-of-specific-object-property-value\/"},"modified":"2023-01-01T01:18:33","modified_gmt":"2022-12-31T19:48:33","slug":"solved-reduce-array-of-objects-to-x-number-of-items-trying-to-keep-at-least-2-of-specific-object-property-value","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-reduce-array-of-objects-to-x-number-of-items-trying-to-keep-at-least-2-of-specific-object-property-value\/","title":{"rendered":"[Solved] Reduce array of objects to x number of items. Trying to keep at least 2 of specific object property value"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-51671728\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"51671728\" data-parentid=\"51669851\" 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>So here&#8217;s my attempt at solving your issue\/request, explanations in the code.<\/p>\n<pre><code>let totalCount = array.length;\nlet typeCounts = {};\n\n\/\/ Separate the array by type and move to an object for easier access\n\/\/ Result: { product: [{id:0,type:'product',name:'Product 1'},{id:0,type:'product',name:'Product 2'},{id:0,type:'product',name:'Product 3'}], accessory: [ ... ], ... }\narray.map((elem) =&gt; typeCounts[elem.type] = [...(typeCounts[elem.type] ? typeCounts[elem.type] : []), elem]);\n\n\/\/ Keep reducing the amount of array entries by one per type per loop\nwhile(totalCount &gt; 8) {\n    let unchanged = true;\n\n    for (let type in typeCounts) {\n        if (typeCounts[type].length &gt; 2) {\n            typeCounts[type].pop(); \/\/ Remove the last entry of that type\n            totalCount -= 1;\n            unchanged = false;\n        }\n    }\n\n    \/\/ Should it not be possible to reduce the array to 8 items, break\n    \/\/ Example: Using an array with 9 types, 1 entry per type\n    \/\/ Ensures we don't get stuck in an infinite loop\n    if (unchanged) {\n        break;\n    }\n}\n\n\/\/ Join our entries back together\n\/\/ Result: [{\"id\":0,\"type\":\"product\",\"name\":\"Product 1\"},{\"id\":0,\"type\":\"product\",\"name\":\"Product 2\"},{\"id\":0,\"type\":\"accessory\",\"name\":\"Accessory 1\"},{\"id\":0,\"type\":\"accessory\",\"name\":\"Accessory 2\"},{\"id\":0,\"type\":\"accessory\",\"name\":\"Accessory 3\"},{\"id\":0,\"type\":\"document\",\"name\":\"Document 1\"},{\"id\":0,\"type\":\"article\",\"name\":\"Article 1\"},{\"id\":0,\"type\":\"article\",\"name\":\"Article 2\"}]\nlet reducedArray = Object.values(typeCounts).reduce((acc, value) =&gt; acc.concat(value), []);\n<\/code><\/pre>\n<\/p><\/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 Reduce array of objects to x number of items. Trying to keep at least 2 of specific object property value <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] So here&#8217;s my attempt at solving your issue\/request, explanations in the code. let totalCount = array.length; let typeCounts = {}; \/\/ Separate the array by type and move to an object for easier access \/\/ Result: { product: [{id:0,type:&#8217;product&#8217;,name:&#8217;Product 1&#8242;},{id:0,type:&#8217;product&#8217;,name:&#8217;Product 2&#8242;},{id:0,type:&#8217;product&#8217;,name:&#8217;Product 3&#8242;}], accessory: [ &#8230; ], &#8230; } array.map((elem) =&gt; typeCounts[elem.type] = [&#8230;(typeCounts[elem.type] ? &#8230; <a title=\"[Solved] Reduce array of objects to x number of items. Trying to keep at least 2 of specific object property value\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-reduce-array-of-objects-to-x-number-of-items-trying-to-keep-at-least-2-of-specific-object-property-value\/\" aria-label=\"More on [Solved] Reduce array of objects to x number of items. Trying to keep at least 2 of specific object property value\">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],"class_list":["post-28560","post","type-post","status-publish","format-standard","hentry","category-solved","tag-arrays","tag-javascript"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Reduce array of objects to x number of items. Trying to keep at least 2 of specific object property value - 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-reduce-array-of-objects-to-x-number-of-items-trying-to-keep-at-least-2-of-specific-object-property-value\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Reduce array of objects to x number of items. Trying to keep at least 2 of specific object property value - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] So here&#8217;s my attempt at solving your issue\/request, explanations in the code. let totalCount = array.length; let typeCounts = {}; \/\/ Separate the array by type and move to an object for easier access \/\/ Result: { product: [{id:0,type:&#039;product&#039;,name:&#039;Product 1&#039;},{id:0,type:&#039;product&#039;,name:&#039;Product 2&#039;},{id:0,type:&#039;product&#039;,name:&#039;Product 3&#039;}], accessory: [ ... ], ... } array.map((elem) =&gt; typeCounts[elem.type] = [...(typeCounts[elem.type] ? ... 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Trying to keep at least 2 of specific object property value - JassWeb","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/jassweb.com\/solved\/solved-reduce-array-of-objects-to-x-number-of-items-trying-to-keep-at-least-2-of-specific-object-property-value\/","og_locale":"en_US","og_type":"article","og_title":"[Solved] Reduce array of objects to x number of items. 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