{"id":6617,"date":"2022-06-28T23:05:00","date_gmt":"2022-06-28T17:35:00","guid":{"rendered":"https:\/\/www.codingbroz.com\/?p=6617"},"modified":"2022-06-20T14:47:13","modified_gmt":"2022-06-20T09:17:13","slug":"ruby-strings-iteration-solution","status":"publish","type":"post","link":"https:\/\/www.codingbroz.com\/ruby-strings-iteration-solution\/","title":{"rendered":"Ruby &#8211; Strings &#8211; Iteration Solution"},"content":{"rendered":"\n<p>In this post, we will solve <strong>Ruby &#8211; Strings &#8211; Iteration HackerRank Solution<\/strong>. This problem <strong>(Ruby &#8211; Strings &#8211; Iteration)<\/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-66409d67dd469\" 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-66409d67dd469\" 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-strings-iteration-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-strings-iteration-solution\/#Solution_%E2%80%93_Ruby_%E2%80%93_Strings_%E2%80%93_Iteration\" title=\"Solution &#8211; Ruby &#8211; Strings &#8211; Iteration\">Solution &#8211; Ruby &#8211; Strings &#8211; Iteration<\/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>In our&nbsp;<a href=\"https:\/\/www.hackerrank.com\/contests\/ruby-tutorials-on-hr\/challenges\/ruby-strings-encoding\" target=\"_blank\" rel=\"noopener\">encoding<\/a>&nbsp;tutorial, we learned about the different ways Ruby 1.8 and Ruby 1.9 (and higher versions) represent strings internally. The major difference is a wide range of encoding (non-ascii) support in the later versions. This change, however, also overhauls the way strings were iterated between the two versions.<\/p>\n\n\n\n<p>In Ruby 1.8, there&#8217;s a single&nbsp;<code>each<\/code>&nbsp;method (remember Enumerable?) which allowed it to iterate over lines of data. While it might seem like a logical option to have, how would one go about iterating on each byte or each character? It turns out that it was not so clean, and people had to resort to&nbsp;<em>tricks<\/em>&nbsp;for some of these functionalities.<\/p>\n\n\n\n<p>With Ruby 1.9,&nbsp;<code>each<\/code>&nbsp;was removed from the&nbsp;<code>String<\/code>&nbsp;class and is no longer an Enumerable. Instead, we have more explicit choices based on what we need to iterate &#8211; bytes, chars, lines or codepoints.<\/p>\n\n\n\n<ul><li><code>each_byte<\/code>&nbsp;iterates sequentially through the individual bytes that comprise a string;<\/li><li><code>each_char<\/code>&nbsp;iterates the characters and is more efficient than&nbsp;<code>[]<\/code>&nbsp;operator or character indexing;<\/li><li><code>each_codepoint<\/code>&nbsp;iterates over the ordinal values of characters in the string;<\/li><li><code>each_line<\/code>&nbsp;iterates the lines.<\/li><\/ul>\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>> money = \"\u00a51000\"\r\n> money.each_byte {|x| p x} # first char represented by two bytes\r\n194\r\n165\r\n49\r\n48\r\n48\r\n48\r\n> money.each_char {|x| p x} # prints each character\r\n\"\u00a5\"\r\n\"1\"\r\n\"0\"\r\n\"0\"\r\n\"0\"<\/code><\/pre>\n\n\n\n<p>Without a doubt, Ruby 1.9 makes iteration easier to understand and implement. Hence, we&#8217;ll stick with Ruby 1.9 and later versions for current and other challenges (unless otherwise stated).<\/p>\n\n\n\n<p><strong>Challenge:<\/strong>&nbsp;Write the method&nbsp;<code>count_multibyte_char<\/code>&nbsp;which takes a string as input and returns the number of multibyte characters (byte size &gt; 1) in it.<\/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>> count_multibyte_char('\u00a51000')\r\n1<\/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_Strings_%E2%80%93_Iteration\"><\/span><strong>Solution &#8211; Ruby &#8211; Strings &#8211; Iteration<\/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=\"\"># Your code here\ndef count_multibyte_char(str)\n    char_count = 0\n    \n    str.each_char do |character|\n        char_count += 1 if character.bytesize > 1\n    end\n    \n    return char_count\nend    \n<\/pre>\n\n\n\n<p><strong>Note:<\/strong> This problem <strong>(<a href=\"https:\/\/www.hackerrank.com\/challenges\/ruby-strings-iteration\/problem?h_r=next-challenge&amp;h_v=zen\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">Ruby &#8211; Strings &#8211; Iteration<\/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; Strings &#8211; Iteration HackerRank Solution. This problem (Ruby &#8211; Strings &#8211; Iteration) 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\/6617"}],"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=6617"}],"version-history":[{"count":2,"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/posts\/6617\/revisions"}],"predecessor-version":[{"id":6619,"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/posts\/6617\/revisions\/6619"}],"wp:attachment":[{"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/media?parent=6617"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/categories?post=6617"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/tags?post=6617"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}