{"id":6518,"date":"2022-06-22T23:05:00","date_gmt":"2022-06-22T17:35:00","guid":{"rendered":"https:\/\/www.codingbroz.com\/?p=6518"},"modified":"2022-06-19T11:32:55","modified_gmt":"2022-06-19T06:02:55","slug":"ruby-enumerable-group-by-solution","status":"publish","type":"post","link":"https:\/\/www.codingbroz.com\/ruby-enumerable-group-by-solution\/","title":{"rendered":"Ruby &#8211; Enumerable &#8211; group_by Solution"},"content":{"rendered":"\n<p>In this post, we will solve <strong>Ruby &#8211; Enumerable &#8211; group_by HackerRank Solution<\/strong>. This problem <strong>(Ruby &#8211; Enumerable &#8211; group_by)<\/strong> is a part of <strong>HackerRank Ruby<\/strong> series.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_65 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<label for=\"ez-toc-cssicon-toggle-item-662c6cb5de78d\" class=\"ez-toc-cssicon-toggle-label\"><label class=\"ez-toc-title\">Table of Contents<\/label>\n<span class=\"ez-toc-cssicon\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #0090ff;color:#0090ff\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #0090ff;color:#0090ff\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-662c6cb5de78d\" checked \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.codingbroz.com\/ruby-enumerable-group-by-solution\/#Task\" title=\"Task\">Task<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.codingbroz.com\/ruby-enumerable-group-by-solution\/#Solution_%E2%80%93_Ruby_%E2%80%93_Enumerable_%E2%80%93_group_by\" title=\"Solution &#8211; Ruby &#8211; Enumerable &#8211; group_by\">Solution &#8211; Ruby &#8211; Enumerable &#8211; group_by<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Task\"><\/span><strong>Task<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Another function often used with data collections is one which groups the elements according to some evaluation result.<\/p>\n\n\n\n<p>Consider the following example. Let&#8217;s say you have a list of 100 integers and you want to group them according to their even and odd value.<\/p>\n\n\n\n<p>In Ruby, you can easily do this by using\u00a0<code>group_by<\/code>\u00a0method provide by Enumerable module.<\/p>\n\n\n\n<pre class=\"wp-block-code has-ast-global-color-5-color has-ast-global-color-8-background-color has-text-color has-background\"><code>> (1..5).group_by {|x| x%2}\r\n{1=>&#91;1,3,5], 0=>&#91;2, 4]}<\/code><\/pre>\n\n\n\n<p>Of course this is a very simple example and its use can be very complicated in nature.<\/p>\n\n\n\n<p>In this challenge, your task is to group the students into two categories corresponding to their marks obtained in a test. The list of students will be provided in a&nbsp;<code>marks<\/code>&nbsp;hash with student name as key and marks obtained (out of 100) as value pair, along with the&nbsp;<code>pass_marks<\/code>&nbsp;as argument.<\/p>\n\n\n\n<p>The method&nbsp;<code>group_by_marks<\/code>&nbsp;must return a&nbsp;<code>Hash<\/code>&nbsp;containing an array of students who passed as value to&nbsp;<code>Passed<\/code>&nbsp;key, and those who failed as value to&nbsp;<code>Failed<\/code>&nbsp;key. If a particular key is empty, don&#8217;t return that key.<\/p>\n\n\n\n<p>For example,<\/p>\n\n\n\n<pre class=\"wp-block-code has-ast-global-color-5-color has-ast-global-color-8-background-color has-text-color has-background\"><code>> marks = {\"Ramesh\":23, \"Vivek\":40, \"Harsh\":88, \"Mohammad\":60}\r\n> group_by_marks(marks, 30)\r\n=> {\"Failed\"=>&#91;&#91;\"Ramesh\", 23]], \"Passed\"=>&#91;&#91;\"Vivek\", 40], &#91;\"Harsh\", 88], &#91;\"Mohammad\", 60]]}<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Solution_%E2%80%93_Ruby_%E2%80%93_Enumerable_%E2%80%93_group_by\"><\/span><strong>Solution &#8211; Ruby &#8211; Enumerable &#8211; group_by<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"ruby\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">def group_by_marks(marks, pass_marks)\n  # your code here\n  marks.group_by do |key, value|\n    if key.empty? == false\n      if value &lt;= pass_marks\n          \"Failed\"\n      else\n          \"Passed\"\n      end\n    end\n  end       \nend\n<\/pre>\n\n\n\n<p><strong>Note:<\/strong> This problem <strong>(<a href=\"https:\/\/www.hackerrank.com\/challenges\/ruby-enumerable-group-by\/problem?h_r=next-challenge&amp;h_v=zen\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">Ruby &#8211; Enumerable &#8211; group_by<\/a>)<\/strong> is generated by <strong><a href=\"https:\/\/www.hackerrank.com\/\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">HackerRank<\/a><\/strong> but the solution is provided by <strong><a href=\"https:\/\/www.codingbroz.com\/\">CodingBroz<\/a><\/strong>. This tutorial is only for <strong>Educational<\/strong> and <strong>Learning<\/strong> purpose.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In this post, we will solve Ruby &#8211; Enumerable &#8211; group_by HackerRank Solution. This problem (Ruby &#8211; Enumerable &#8211; group_by) is a part of HackerRank Ruby series.<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[9,680],"tags":[681],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/posts\/6518"}],"collection":[{"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/comments?post=6518"}],"version-history":[{"count":2,"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/posts\/6518\/revisions"}],"predecessor-version":[{"id":6520,"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/posts\/6518\/revisions\/6520"}],"wp:attachment":[{"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/media?parent=6518"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/categories?post=6518"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/tags?post=6518"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}