{"id":16821,"date":"2022-10-22T06:47:02","date_gmt":"2022-10-22T01:17:02","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-javascript-merge-objects-return-arrays-with-the-keys-and-sum-of-values\/"},"modified":"2022-10-22T06:47:02","modified_gmt":"2022-10-22T01:17:02","slug":"solved-javascript-merge-objects-return-arrays-with-the-keys-and-sum-of-values","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-javascript-merge-objects-return-arrays-with-the-keys-and-sum-of-values\/","title":{"rendered":"[Solved] javascript &#8211; merge objects return arrays with the keys and sum of values"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-48654041\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"48654041\" data-parentid=\"48653981\" data-score=\"1\" 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 can <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/Array\/reduce\">reduce<\/a> the objects into a <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/Map\">Map<\/a> by iterating the sources of each object using <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/Array\/forEach\">forEach<\/a>. You spread the Map&#8217;s <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/Map\/keys\">keys iterator<\/a> to get the sources array, and spread the <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/Map\/values\">values iterator<\/a> to get the values 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>const data = [{\"year\":2017,\"month\":1,\"sources\":{\"source1\":50,\"source2\":30,\"source3\":10}},{\"year\":2017,\"month\":2,\"sources\":{\"source1\":50,\"source2\":10}},{\"year\":2017,\"month\":3,\"sources\":{\"source1\":10,\"source2\":10,\"source3\":1}}]\r\n\r\nconst sourcesMap = data.reduce((m, { sources }) =&gt; { \r\n  Object.entries(sources).forEach(([key, value]) =&gt; m.set(key, (m.get(key) || 0) + value))\r\n\r\n  return m;\r\n}, new Map())\r\n\r\nconst sources = [...sourcesMap.keys()]\r\nconst values = [...sourcesMap.values()]\r\n\r\nconsole.log(sources)\r\nconsole.log(values)<\/code><\/pre>\n<\/div>\n<\/div><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">0<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved javascript &#8211; merge objects return arrays with the keys and sum of values <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] You can reduce the objects into a Map by iterating the sources of each object using forEach. You spread the Map&#8217;s keys iterator to get the sources array, and spread the values iterator to get the values array: const data = [{&#8220;year&#8221;:2017,&#8221;month&#8221;:1,&#8221;sources&#8221;:{&#8220;source1&#8243;:50,&#8221;source2&#8243;:30,&#8221;source3&#8221;:10}},{&#8220;year&#8221;:2017,&#8221;month&#8221;:2,&#8221;sources&#8221;:{&#8220;source1&#8243;:50,&#8221;source2&#8221;:10}},{&#8220;year&#8221;:2017,&#8221;month&#8221;:3,&#8221;sources&#8221;:{&#8220;source1&#8243;:10,&#8221;source2&#8243;:10,&#8221;source3&#8221;:1}}] const sourcesMap = data.reduce((m, { sources }) =&gt; { Object.entries(sources).forEach(([key, value]) =&gt; &#8230; <a title=\"[Solved] javascript &#8211; merge objects return arrays with the keys and sum of values\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-javascript-merge-objects-return-arrays-with-the-keys-and-sum-of-values\/\" aria-label=\"More on [Solved] javascript &#8211; merge objects return arrays with the keys and sum of values\">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":[361,333,430],"class_list":["post-16821","post","type-post","status-publish","format-standard","hentry","category-solved","tag-arrays","tag-javascript","tag-object"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] javascript - merge objects return arrays with the keys and sum of values - 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-javascript-merge-objects-return-arrays-with-the-keys-and-sum-of-values\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] javascript - merge objects return arrays with the keys and sum of values - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] You can reduce the objects into a Map by iterating the sources of each object using forEach. You spread the Map&#8217;s keys iterator to get the sources array, and spread the values iterator to get the values array: const data = [{&quot;year&quot;:2017,&quot;month&quot;:1,&quot;sources&quot;:{&quot;source1&quot;:50,&quot;source2&quot;:30,&quot;source3&quot;:10}},{&quot;year&quot;:2017,&quot;month&quot;:2,&quot;sources&quot;:{&quot;source1&quot;:50,&quot;source2&quot;:10}},{&quot;year&quot;:2017,&quot;month&quot;:3,&quot;sources&quot;:{&quot;source1&quot;:10,&quot;source2&quot;:10,&quot;source3&quot;:1}}] const sourcesMap = data.reduce((m, { sources }) =&gt; { Object.entries(sources).forEach(([key, value]) =&gt; ... 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You spread the Map&#8217;s keys iterator to get the sources array, and spread the values iterator to get the values array: const data = [{\"year\":2017,\"month\":1,\"sources\":{\"source1\":50,\"source2\":30,\"source3\":10}},{\"year\":2017,\"month\":2,\"sources\":{\"source1\":50,\"source2\":10}},{\"year\":2017,\"month\":3,\"sources\":{\"source1\":10,\"source2\":10,\"source3\":1}}] const sourcesMap = data.reduce((m, { sources }) =&gt; { Object.entries(sources).forEach(([key, value]) =&gt; ... 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