Rivalry2

Ruby
2026-02-26 18:39 Diff
https://ru.hexlet.io/courses/ruby-basics/lessons/iteration-over-string/theory_unit
Полный доступ к материалам
Для закрепления блоков рассмотрим ещё один пример итерации – обход строки. В большинстве языков для обхода строки есть два варианта:
Преобразование строки в массив символов и обход этого массива
Проход по числам от нуля до длины строки - 1. Обращение к символам по индексу.
В таких моментах проявляется выразительность Ruby и мощь его встроенной библиотеки. Для обхода строки ничего не нужно придумывать, всё уже встроено:
Метод each_char() определен именно на строке.
Ниже чуть более сложный пример с агрегацией. Код, который считает количество букв e в строке:
Рекомендуемые программы

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Нехорошо ведь смешивать конкатенацию с интерполяцией.&quot;,&quot;plain_title&quot;:&quot;В квизе есть строка result += \&quot;#{char} \&quot;. Нехорошо ведь смешивать конкатенацию с интерполяцией. &quot;,&quot;creator&quot;:{&quot;public_name&quot;:&quot;Сергей К.&quot;,&quot;id&quot;:5174,&quot;is_tutor&quot;:false},&quot;comments&quot;:[{&quot;creator&quot;:{&quot;public_name&quot;:&quot;Aleksandr Litvinov&quot;,&quot;id&quot;:117182,&quot;is_tutor&quot;:true},&quot;id&quot;:172522,&quot;body&quot;:&quot;Да, действительно. Поправил.&quot;,&quot;topic_id&quot;:85512}],&quot;communitable&quot;:{&quot;parent_entity_name&quot;:null,&quot;parent_entity_url&quot;:null,&quot;entity_name&quot;:&quot;Обход строки&quot;,&quot;entity_url&quot;:null,&quot;active&quot;:true}},{&quot;id&quot;:86809,&quot;title&quot;:&quot;Всем привет. \nОбъясните пожалуйста вот эту строку `result = \&quot;#{c}#{result}\&quot;` \nНе совсем понятно как это происходит)&quot;,&quot;plain_title&quot;:&quot;Всем привет.  Объясните пожалуйста вот эту строку result = \&quot;#{c}#{result}\&quot;  Не совсем понятно как это происходит) &quot;,&quot;creator&quot;:{&quot;public_name&quot;:&quot;Ilnaz Kamalov&quot;,&quot;id&quot;:448293,&quot;is_tutor&quot;:false},&quot;comments&quot;:[{&quot;creator&quot;:{&quot;public_name&quot;:&quot;Aleksandr Litvinov&quot;,&quot;id&quot;:117182,&quot;is_tutor&quot;:true},&quot;id&quot;:174416,&quot;body&quot;:&quot;Приветствую! Собирается новая строка из двух частей: из символа и предыдущей строки&quot;,&quot;topic_id&quot;:86809}],&quot;communitable&quot;:{&quot;parent_entity_name&quot;:null,&quot;parent_entity_url&quot;:null,&quot;entity_name&quot;:&quot;Обход строки&quot;,&quot;entity_url&quot;:null,&quot;active&quot;:true}},{&quot;id&quot;:90044,&quot;title&quot;:&quot;https://ru.hexlet.io/code_reviews/1076029\nДоброго дня. Моя функция reverse показывает мне правильный разворот строки, но тест false.\n# Running:\ntelxeh\nF\nFinished in 0.007319s, 136.6324 runs/s, 136.6324 assertions/s.\n  1) Failure:\nfunction#test_0001_should works [test.rb:11]:\n    assert { reverse(&#x27;hexlet&#x27;) == &#x27;telxeh&#x27; }\n             |                 |\n             |                 false\n             nil\nНе догоняю - что не так.&quot;,&quot;plain_title&quot;:&quot;https://ru.hexlet.io/code_reviews/1076029 Доброго дня. Моя функция reverse показывает мне правильный разворот строки, но тест false. Running: telxeh F Finished in 0.007319s, 136.6324 runs/s, 136.6324 assertions/s.   1) Failure: function#test0001should works [test.rb:11]:     assert { reverse(&#x27;hexlet&#x27;) == &#x27;telxeh&#x27; }              |                 |              |                 false              nil Не догоняю - что не так. &quot;,&quot;creator&quot;:{&quot;public_name&quot;:&quot;Игорь Конст&quot;,&quot;id&quot;:665520,&quot;is_tutor&quot;:false},&quot;comments&quot;:[{&quot;creator&quot;:{&quot;public_name&quot;:&quot;Игорь Конст&quot;,&quot;id&quot;:665520,&quot;is_tutor&quot;:false},&quot;id&quot;:178878,&quot;body&quot;:&quot;puts txt видимо что-то добавляет к строке. Без puts все заработало.&quot;,&quot;topic_id&quot;:90044},{&quot;creator&quot;:{&quot;public_name&quot;:&quot;Aleksandr Litvinov&quot;,&quot;id&quot;:117182,&quot;is_tutor&quot;:true},&quot;id&quot;:178985,&quot;body&quot;:&quot;Да, результат нужно возвращать, а не печатать&quot;,&quot;topic_id&quot;:90044}],&quot;communitable&quot;:{&quot;parent_entity_name&quot;:null,&quot;parent_entity_url&quot;:null,&quot;entity_name&quot;:&quot;Обход строки&quot;,&quot;entity_url&quot;:null,&quot;active&quot;:true}}],&quot;lesson&quot;:{&quot;exercise&quot;:{&quot;id&quot;:1961,&quot;slug&quot;:&quot;ruby_basics_iteration_over_string&quot;,&quot;name&quot;:null,&quot;state&quot;:&quot;active&quot;,&quot;kind&quot;:&quot;exercise&quot;,&quot;language&quot;:&quot;ruby&quot;,&quot;locale&quot;:&quot;ru&quot;,&quot;has_web_view&quot;:false,&quot;has_test_view&quot;:false,&quot;reviewable&quot;:true,&quot;readme&quot;:&quot;## solution.rb\n\nРеализуйте функцию `reverse()`, которая переворачивает строку. Не используйте в своем решении метод строки reverse\n\n```ruby\nreverse &#x27;hexlet&#x27; # telxeh\nreverse &#x27;basics&#x27; # scisab\n```\n&quot;,&quot;prepared_readme&quot;:&quot;## solution.rb\n\nРеализуйте функцию `reverse()`, которая переворачивает строку. Не используйте в своем решении метод строки reverse\n\n```ruby\nreverse &#x27;hexlet&#x27; # telxeh\nreverse &#x27;basics&#x27; # scisab\n```\n&quot;,&quot;has_solution&quot;:true,&quot;entity_name&quot;:&quot;Обход строки&quot;},&quot;units&quot;:[{&quot;id&quot;:6407,&quot;name&quot;:&quot;theory&quot;,&quot;url&quot;:&quot;/courses/ruby-basics/lessons/iteration-over-string/theory_unit&quot;},{&quot;id&quot;:7017,&quot;name&quot;:&quot;quiz&quot;,&quot;url&quot;:&quot;/courses/ruby-basics/lessons/iteration-over-string/quiz_unit&quot;},{&quot;id&quot;:6422,&quot;name&quot;:&quot;exercise&quot;,&quot;url&quot;:&quot;/courses/ruby-basics/lessons/iteration-over-string/exercise_unit&quot;}],&quot;links&quot;:[],&quot;ordered_units&quot;:[{&quot;id&quot;:6407,&quot;name&quot;:&quot;theory&quot;,&quot;url&quot;:&quot;/courses/ruby-basics/lessons/iteration-over-string/theory_unit&quot;},{&quot;id&quot;:7017,&quot;name&quot;:&quot;quiz&quot;,&quot;url&quot;:&quot;/courses/ruby-basics/lessons/iteration-over-string/quiz_unit&quot;},{&quot;id&quot;:6422,&quot;name&quot;:&quot;exercise&quot;,&quot;url&quot;:&quot;/courses/ruby-basics/lessons/iteration-over-string/exercise_unit&quot;}],&quot;id&quot;:2814,&quot;slug&quot;:&quot;iteration-over-string&quot;,&quot;state&quot;:&quot;approved&quot;,&quot;name&quot;:&quot;Обход строки&quot;,&quot;course_order&quot;:470,&quot;goal&quot;:&quot;Закрепить работу с блоками на примере обхода строк&quot;,&quot;self_study&quot;:null,&quot;theory_video_provider&quot;:null,&quot;theory_video_uid&quot;:null,&quot;theory&quot;:&quot;Для закрепления блоков рассмотрим ещё один пример итерации – обход строки. В большинстве языков для обхода строки есть два варианта:\n\n* Преобразование строки в массив символов и обход этого массива\n* Проход по числам от нуля до длины строки - 1. Обращение к символам по индексу.\n\nВ таких моментах проявляется выразительность Ruby и мощь его встроенной библиотеки. Для обхода строки ничего не нужно придумывать, всё уже встроено:\n\n```ruby\ncompany_name = &#x27;hexlet&#x27;\ncompany_name.each_char do |c| # c – значит char\n  puts c\nend\n# =&gt; h\n# =&gt; e\n# =&gt; x\n# =&gt; l\n# =&gt; e\n# =&gt; t\n```\n\nМетод [each_char()](https://ruby-doc.org/core-2.7.2/String.html#method-i-each_char) определен именно на строке.\n\nНиже чуть более сложный пример с агрегацией. Код, который считает количество букв **e** в строке:\n\n```ruby\ncompany_name = &#x27;hexlet&#x27;\nletters_count = 0\ncompany_name.each_char do |c|\n  if c == &#x27;e&#x27;\n    letters_count += 1\n  end\nend\n```\n&quot;},&quot;lessonMember&quot;:null,&quot;courseMember&quot;:null,&quot;course&quot;:{&quot;start_lesson&quot;:{&quot;exercise&quot;:null,&quot;units&quot;:[{&quot;id&quot;:7191,&quot;name&quot;:&quot;theory&quot;,&quot;url&quot;:&quot;/courses/ruby-basics/lessons/intro/theory_unit&quot;}],&quot;links&quot;:[],&quot;ordered_units&quot;:[{&quot;id&quot;:7191,&quot;name&quot;:&quot;theory&quot;,&quot;url&quot;:&quot;/courses/ruby-basics/lessons/intro/theory_unit&quot;}],&quot;id&quot;:3209,&quot;slug&quot;:&quot;intro&quot;,&quot;state&quot;:&quot;approved&quot;,&quot;name&quot;:&quot;Введение&quot;,&quot;course_order&quot;:50,&quot;goal&quot;:&quot;Знакомимся с курсом&quot;,&quot;self_study&quot;:null,&quot;theory_video_provider&quot;:null,&quot;theory_video_uid&quot;:null,&quot;theory&quot;:&quot;Ruby — язык, созданный для того, чтобы программисты были счастливы. Он взял в себя лучшее из Lisp, Smalltalk и Perl — он объектно-ориентирован, но в то же время его декларативность позволяет писать в процедурной и функциональной парадигме.\n\nЛаконичный код, отсутствие шума и богатые возможности делают Ruby одним из самых \&quot;быстрых\&quot; языков для написания кода.\n\nПрофессия разработчик на Ruby on Rails на Хекслете дает все необходимые знания и навыки для трудоустройства. С этого курса начинается погружение в сам язык.\n\nКурс включает в себя основы программирования на Ruby. Также в нем объясняются такие вещи, как особенности самого Ruby, его отличия от других языков, рассказывается о функциональном программировании, тестировании, метапрограммировании и многом другом.\n\nЦели данного курса:\n\n* Познакомиться с основными конструкциями языка\n* Научиться работать в среде Хекслета, разобраться со структурой практических заданий\n* Познакомиться с отладкой и научиться эффективно ее выполнять\n&quot;},&quot;id&quot;:232,&quot;slug&quot;:&quot;ruby-basics&quot;,&quot;challenges_count&quot;:10,&quot;name&quot;:&quot;Ruby&quot;,&quot;allow_indexing&quot;:true,&quot;state&quot;:&quot;approved&quot;,&quot;course_state&quot;:&quot;finished&quot;,&quot;pricing_type&quot;:&quot;paid&quot;,&quot;description&quot;:&quot;На этом курсе вы изучите основы языка Ruby. Вы познакомитесь с экосистемой Ruby, ключевыми возможностями языка, а также узнаете о объектно-ориентированном программировании и метапрограммировании. В итоге научитесь использовать и определять функции, писать несложные программы, искать и анализировать ошибки в коде. Знания из этого курса помогут получить основное представление о языке Ruby, его принципах и особенностях.&quot;,&quot;kind&quot;:&quot;basic&quot;,&quot;updated_at&quot;:&quot;2026-01-20T11:54:35.251Z&quot;,&quot;language&quot;:&quot;ruby&quot;,&quot;duration_cache&quot;:151680,&quot;skills&quot;:[&quot;Синтаксису Ruby&quot;,&quot;Использовать коллекции&quot;,&quot;Писать в функциональном стиле&quot;,&quot;Тестировать свой код&quot;,&quot;Писать программы, которые могут менять свое поведение во время выполнения&quot;,&quot;Разбираться в богатой экосистеме Ruby-библиотек&quot;],&quot;keywords&quot;:[&quot;ruby&quot;,&quot;rubygems&quot;,&quot;testing&quot;,&quot;oop&quot;,&quot;metaprogramming&quot;],&quot;lessons_count&quot;:33,&quot;cover&quot;:&quot;https://hexlet.io/rails/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6OTExMSwicHVyIjoiYmxvYl9pZCJ9fQ==--096a7d4515011efc87371bcdd9152f2b583e3c78/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJwbmciLCJyZXNpemVfdG9fZmlsbCI6WzYwMCw0MDBdfSwicHVyIjoidmFyaWF0aW9uIn19--6067466c2912ca31a17eddee04b8cf2a38c6ad17/image.png&quot;},&quot;recommendedLandings&quot;:[{&quot;stack&quot;:{&quot;id&quot;:475,&quot;slug&quot;:&quot;rails&quot;,&quot;title&quot;:&quot;Ruby on 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0.15);--mantine-color-grape-light-hover: rgba(229, 153, 247, 0.2);--mantine-color-grape-light-color: var(--mantine-color-grape-0);--mantine-color-grape-outline: var(--mantine-color-grape-1);--mantine-color-grape-outline-hover: rgba(243, 217, 250, 0.05);--mantine-color-violet-filled: var(--mantine-color-violet-5);--mantine-color-violet-filled-hover: var(--mantine-color-violet-6);--mantine-color-violet-light: rgba(209, 111, 255, 0.15);--mantine-color-violet-light-hover: rgba(209, 111, 255, 0.2);--mantine-color-violet-light-color: var(--mantine-color-violet-0);--mantine-color-violet-outline: var(--mantine-color-violet-1);--mantine-color-violet-outline-hover: rgba(241, 207, 255, 0.05);--mantine-color-indigo-filled: var(--mantine-color-indigo-5);--mantine-color-indigo-filled-hover: var(--mantine-color-indigo-6);--mantine-color-indigo-light: rgba(123, 121, 235, 0.15);--mantine-color-indigo-light-hover: rgba(123, 121, 235, 0.2);--mantine-color-indigo-light-color: 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0.05);--mantine-color-teal-filled: var(--mantine-color-teal-5);--mantine-color-teal-filled-hover: var(--mantine-color-teal-6);--mantine-color-teal-light: rgba(99, 230, 190, 0.15);--mantine-color-teal-light-hover: rgba(99, 230, 190, 0.2);--mantine-color-teal-light-color: var(--mantine-color-teal-0);--mantine-color-teal-outline: var(--mantine-color-teal-1);--mantine-color-teal-outline-hover: rgba(195, 250, 232, 0.05);--mantine-color-green-filled: var(--mantine-color-green-5);--mantine-color-green-filled-hover: var(--mantine-color-green-6);--mantine-color-green-light: rgba(134, 223, 148, 0.15);--mantine-color-green-light-hover: rgba(134, 223, 148, 0.2);--mantine-color-green-light-color: var(--mantine-color-green-0);--mantine-color-green-outline: var(--mantine-color-green-1);--mantine-color-green-outline-hover: rgba(215, 246, 220, 0.05);--mantine-color-lime-filled: var(--mantine-color-lime-5);--mantine-color-lime-filled-hover: var(--mantine-color-lime-6);--mantine-color-lime-light: rgba(192, 235, 117, 0.15);--mantine-color-lime-light-hover: rgba(192, 235, 117, 0.2);--mantine-color-lime-light-color: var(--mantine-color-lime-0);--mantine-color-lime-outline: var(--mantine-color-lime-1);--mantine-color-lime-outline-hover: rgba(233, 250, 200, 0.05);--mantine-color-yellow-filled: var(--mantine-color-yellow-5);--mantine-color-yellow-filled-hover: var(--mantine-color-yellow-6);--mantine-color-yellow-light: rgba(255, 201, 102, 0.15);--mantine-color-yellow-light-hover: rgba(255, 201, 102, 0.2);--mantine-color-yellow-light-color: var(--mantine-color-yellow-0);--mantine-color-yellow-outline: var(--mantine-color-yellow-1);--mantine-color-yellow-outline-hover: rgba(255, 238, 205, 0.05);--mantine-color-orange-filled: var(--mantine-color-orange-5);--mantine-color-orange-filled-hover: var(--mantine-color-orange-6);--mantine-color-orange-light: rgba(255, 192, 120, 0.15);--mantine-color-orange-light-hover: rgba(255, 192, 120, 0.2);--mantine-color-orange-light-color: var(--mantine-color-orange-0);--mantine-color-orange-outline: var(--mantine-color-orange-1);--mantine-color-orange-outline-hover: rgba(255, 232, 204, 0.05);--app-cta-gradient: linear-gradient(90deg, var(--mantine-color-blue-9) 0%, var(--mantine-color-cyan-7) 100%);--app-color-surface: #2e2e2e;}

:root[data-mantine-color-scheme="light"], :host([data-mantine-color-scheme="light"]){--mantine-color-anchor: var(--mantine-color-text);--mantine-color-dimmed: #495057;--mantine-color-red-light: rgba(224, 40, 41, 0.1);--mantine-color-red-light-hover: rgba(224, 40, 41, 0.12);--mantine-color-red-outline-hover: rgba(224, 40, 41, 0.05);--mantine-color-violet-light: rgba(176, 9, 255, 0.1);--mantine-color-violet-light-hover: rgba(176, 9, 255, 0.12);--mantine-color-violet-outline-hover: rgba(176, 9, 255, 0.05);--mantine-color-indigo-light: rgba(45, 42, 223, 0.1);--mantine-color-indigo-light-hover: rgba(45, 42, 223, 0.12);--mantine-color-indigo-outline-hover: rgba(45, 42, 223, 0.05);--mantine-color-cyan-light: rgba(0, 194, 255, 0.1);--mantine-color-cyan-light-hover: rgba(0, 194, 255, 0.12);--mantine-color-cyan-outline-hover: rgba(0, 194, 255, 0.05);--mantine-color-green-light: rgba(63, 204, 84, 0.1);--mantine-color-green-light-hover: rgba(63, 204, 84, 0.12);--mantine-color-green-outline-hover: rgba(63, 204, 84, 0.05);--mantine-color-yellow-light: rgba(255, 169, 15, 0.1);--mantine-color-yellow-light-hover: rgba(255, 169, 15, 0.12);--mantine-color-yellow-outline-hover: rgba(255, 169, 15, 0.05);--app-color-surface: #f1f3f5;--app-cta-gradient: linear-gradient(90deg, var(--mantine-color-blue-filled) 0%, var(--mantine-color-cyan-5) 100%);}</style><style data-mantine-styles="classes">@media (max-width: 35.99375em) {.mantine-visible-from-xs {display: none !important;}}@media (min-width: 36em) {.mantine-hidden-from-xs {display: none !important;}}@media (max-width: 47.99375em) {.mantine-visible-from-sm {display: none !important;}}@media (min-width: 48em) {.mantine-hidden-from-sm {display: none !important;}}@media (max-width: 61.99375em) {.mantine-visible-from-md {display: none !important;}}@media (min-width: 62em) {.mantine-hidden-from-md {display: none !important;}}@media (max-width: 74.99375em) {.mantine-visible-from-lg {display: none !important;}}@media (min-width: 75em) {.mantine-hidden-from-lg {display: none !important;}}@media (max-width: 87.99375em) {.mantine-visible-from-xl {display: none !important;}}@media (min-width: 88em) {.mantine-hidden-from-xl {display: none !important;}}</style><div style="position:absolute;top:0rem" class=""></div><div style="max-width:var(--container-size-xl);height:100%;min-height:0rem" class=""><style data-mantine-styles="inline">.__m__-_R_5ub_{--grid-gutter:0rem;}</style><div style="height:100%;min-height:0rem" class="m_410352e9 mantine-Grid-root __m__-_R_5ub_"><div class="m_dee7bd2f mantine-Grid-inner" style="height:100%"><style data-mantine-styles="inline">.__m__-_R_rdub_{--col-flex-grow:auto;--col-flex-basis:91.66666666666667%;--col-max-width:91.66666666666667%;}@media(min-width: 48em){.__m__-_R_rdub_{--col-flex-grow:auto;--col-flex-basis:83.33333333333334%;--col-max-width:83.33333333333334%;}}</style><div style="min-width:0rem;height:100%;min-height:0rem;display:flex" class="m_96bdd299 mantine-Grid-col __m__-_R_rdub_"><style data-mantine-styles="inline">.__m__-_R_6qrdub_{margin-top:0rem;padding-inline:var(--mantine-spacing-xs);width:100%;}@media(min-width: 48em){.__m__-_R_6qrdub_{margin-top:var(--mantine-spacing-xl);width:80%;}}@media(min-width: 62em){.__m__-_R_6qrdub_{padding-inline:var(--mantine-spacing-xl);}}</style><div style="margin-inline:auto;max-width:var(--mantine-breakpoint-xl)" class="__m__-_R_6qrdub_"><div style="color:var(--mantine-color-dimmed)" class="m_4451eb3a mantine-Center-root" data-inline="true"><div style="--ti-size:var(--ti-size-xs);--ti-bg:transparent;--ti-color:var(--mantine-color-indigo-light-color);--ti-bd:calc(0.0625rem * var(--mantine-scale)) solid transparent;margin-inline-end:calc(0.125rem * var(--mantine-scale));color:inherit" class="m_7341320d mantine-ThemeIcon-root" data-variant="transparent" data-size="xs"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="tabler-icon tabler-icon-lock "><path d="M5 13a2 2 0 0 1 2 -2h10a2 2 0 0 1 2 2v6a2 2 0 0 1 -2 2h-10a2 2 0 0 1 -2 -2v-6"></path><path d="M11 16a1 1 0 1 0 2 0a1 1 0 0 0 -2 0"></path><path d="M8 11v-4a4 4 0 1 1 8 0v4"></path></svg></div><p style="font-size:var(--mantine-font-size-sm)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Ruby</p></div><h1 style="--title-fw:var(--mantine-h1-font-weight);--title-lh:var(--mantine-h1-line-height);--title-fz:var(--mantine-h1-font-size);margin-bottom:var(--mantine-spacing-xl)" class="m_8a5d1357 mantine-Title-root" data-order="1">Теория: Обход строки</h1><script type="application/ld+json">{"@context":"https://schema.org","@type":"LearningResource","name":"Обход строки","inLanguage":"ru","isPartOf":{"@type":"LearningResource","name":"Ruby"},"isAccessibleForFree":"False","hasPart":{"@type":"WebPageElement","isAccessibleForFree":"False","cssSelector":".paywalled"}}</script><div class=""><div style="--alert-color:var(--mantine-color-indigo-light-color);margin-bottom:var(--mantine-spacing-lg);font-size:var(--mantine-font-size-lg)" class="m_66836ed3 mantine-Alert-root" id="mantine-_R_remqrdub_" role="alert" aria-describedby="mantine-_R_remqrdub_-body" aria-labelledby="mantine-_R_remqrdub_-title"><div class="m_a5d60502 mantine-Alert-wrapper"><div class="m_667f2a6a mantine-Alert-icon"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="tabler-icon tabler-icon-rocket "><path d="M4 13a8 8 0 0 1 7 7a6 6 0 0 0 3 -5a9 9 0 0 0 6 -8a3 3 0 0 0 -3 -3a9 9 0 0 0 -8 6a6 6 0 0 0 -5 3"></path><path d="M7 14a6 6 0 0 0 -3 6a6 6 0 0 0 6 -3"></path><path d="M14 9a1 1 0 1 0 2 0a1 1 0 1 0 -2 0"></path></svg></div><div class="m_667c2793 mantine-Alert-body"><div class="m_6a03f287 mantine-Alert-title"><span id="mantine-_R_remqrdub_-title" class="m_698f4f23 mantine-Alert-label">Полный доступ к материалам</span></div><div id="mantine-_R_remqrdub_-body" class="m_7fa78076 mantine-Alert-message"><div style="--group-gap:var(--mantine-spacing-md);--group-align:center;--group-justify:space-between;--group-wrap:wrap" class="m_4081bf90 mantine-Group-root"><p class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Зарегистрируйтесь и получите доступ к этому и десяткам других курсов</p><a style="--button-height:var(--button-height-xs);--button-padding-x:var(--button-padding-x-xs);--button-fz:var(--mantine-font-size-xs);--button-bg:linear-gradient(45deg, var(--mantine-color-blue-filled) 0%, var(--mantine-color-cyan-filled) 100%);--button-hover:linear-gradient(45deg, var(--mantine-color-blue-filled) 0%, var(--mantine-color-cyan-filled) 100%);--button-color:var(--mantine-color-white);--button-bd:none" class="mantine-focus-auto mantine-active m_77c9d27d mantine-Button-root m_87cf2631 mantine-UnstyledButton-root" data-variant="gradient" data-size="xs" href="/u/new"><span class="m_80f1301b mantine-Button-inner"><span class="m_811560b9 mantine-Button-label">Зарегистрироваться</span></span></a></div></div></div></div></div><div class="paywalled m_d08caa0 mantine-Typography-root"><p>Для закрепления блоков рассмотрим ещё один пример итерации – обход строки. В большинстве языков для обхода строки есть два варианта:</p>
<ul>
<li>Преобразование строки в массив символов и обход этого массива</li>
<li>Проход по числам от нуля до длины строки - 1. Обращение к символам по индексу.</li>
</ul>
<p>В таких моментах проявляется выразительность Ruby и мощь его встроенной библиотеки. Для обхода строки ничего не нужно придумывать, всё уже встроено:</p>
<div style="margin-bottom:var(--mantine-spacing-lg)" class="m_e597c321 mantine-CodeHighlight-codeHighlight" dir="ltr"><div class="m_be7e9c9c mantine-CodeHighlight-controls"><button style="--ai-bg:transparent;--ai-hover:transparent;--ai-color:inherit;--ai-bd:none" class="mantine-focus-auto mantine-active m_d498bab7 mantine-CodeHighlight-control m_8d3f4000 mantine-ActionIcon-root m_87cf2631 mantine-UnstyledButton-root" data-variant="none" type="button" aria-label="Copy code"><span class="m_8d3afb97 mantine-ActionIcon-icon"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><path stroke="none" d="M0 0h24v24H0z" fill="none"></path><path d="M8 8m0 2a2 2 0 0 1 2 -2h8a2 2 0 0 1 2 2v8a2 2 0 0 1 -2 2h-8a2 2 0 0 1 -2 -2z"></path><path d="M16 8v-2a2 2 0 0 0 -2 -2h-8a2 2 0 0 0 -2 2v8a2 2 0 0 0 2 2h2"></path></svg></span></button></div><div style="--scrollarea-scrollbar-size:calc(0.25rem * var(--mantine-scale));--sa-corner-width:0px;--sa-corner-height:0px" class="m_f744fd40 mantine-CodeHighlight-scrollarea m_d57069b5 mantine-ScrollArea-root" dir="ltr"><div style="overflow-x:hidden;overflow-y:hidden;overscroll-behavior-inline:none" class="m_c0783ff9 mantine-ScrollArea-viewport" data-scrollbars="xy"><div class="m_b1336c6 mantine-ScrollArea-content"><pre class="m_2c47c4fd mantine-CodeHighlight-pre" style="padding:0"><code class="m_5caae6d3 mantine-CodeHighlight-code">company_name = &#x27;hexlet&#x27;
company_name.each_char do |c| # c – значит char
  puts c
end
# =&gt; h
# =&gt; e
# =&gt; x
# =&gt; l
# =&gt; e
# =&gt; t</code></pre></div></div></div><button class="mantine-focus-auto m_c9378bc2 mantine-CodeHighlight-showCodeButton m_87cf2631 mantine-UnstyledButton-root" data-hidden="true" type="button">Expand code</button></div>
<p>Метод <a style="text-decoration:underline" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="https://ruby-doc.org/core-2.7.2/String.html#method-i-each_char" rel="noopener noreferrer" target="_blank">each_char()</a> определен именно на строке.</p>
<p>Ниже чуть более сложный пример с агрегацией. Код, который считает количество букв <strong>e</strong> в строке:</p>
<div style="margin-bottom:var(--mantine-spacing-lg)" class="m_e597c321 mantine-CodeHighlight-codeHighlight" dir="ltr"><div class="m_be7e9c9c mantine-CodeHighlight-controls"><button style="--ai-bg:transparent;--ai-hover:transparent;--ai-color:inherit;--ai-bd:none" class="mantine-focus-auto mantine-active m_d498bab7 mantine-CodeHighlight-control m_8d3f4000 mantine-ActionIcon-root m_87cf2631 mantine-UnstyledButton-root" data-variant="none" type="button" aria-label="Copy code"><span class="m_8d3afb97 mantine-ActionIcon-icon"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><path stroke="none" d="M0 0h24v24H0z" fill="none"></path><path d="M8 8m0 2a2 2 0 0 1 2 -2h8a2 2 0 0 1 2 2v8a2 2 0 0 1 -2 2h-8a2 2 0 0 1 -2 -2z"></path><path d="M16 8v-2a2 2 0 0 0 -2 -2h-8a2 2 0 0 0 -2 2v8a2 2 0 0 0 2 2h2"></path></svg></span></button></div><div style="--scrollarea-scrollbar-size:calc(0.25rem * var(--mantine-scale));--sa-corner-width:0px;--sa-corner-height:0px" class="m_f744fd40 mantine-CodeHighlight-scrollarea m_d57069b5 mantine-ScrollArea-root" dir="ltr"><div style="overflow-x:hidden;overflow-y:hidden;overscroll-behavior-inline:none" class="m_c0783ff9 mantine-ScrollArea-viewport" data-scrollbars="xy"><div class="m_b1336c6 mantine-ScrollArea-content"><pre class="m_2c47c4fd mantine-CodeHighlight-pre" style="padding:0"><code class="m_5caae6d3 mantine-CodeHighlight-code">company_name = &#x27;hexlet&#x27;
letters_count = 0
company_name.each_char do |c|
  if c == &#x27;e&#x27;
    letters_count += 1
  end
end</code></pre></div></div></div><button class="mantine-focus-auto m_c9378bc2 mantine-CodeHighlight-showCodeButton m_87cf2631 mantine-UnstyledButton-root" data-hidden="true" type="button">Expand code</button></div></div><div style="margin-block:var(--mantine-spacing-xl)" class=""><h2 style="--title-fw:var(--mantine-h2-font-weight);--title-lh:var(--mantine-h2-line-height);--title-fz:var(--mantine-h2-font-size);margin-bottom:var(--mantine-spacing-md)" class="m_8a5d1357 mantine-Title-root" data-order="2">Рекомендуемые программы</h2><style data-mantine-styles="inline">.__m__-_R_2mremqrdub_{--carousel-slide-gap:var(--mantine-spacing-xs);--carousel-slide-size:70%;}@media(min-width: 36em){.__m__-_R_2mremqrdub_{--carousel-slide-gap:var(--mantine-spacing-xl);--carousel-slide-size:50%;}}</style><div style="--carousel-control-size:calc(2.5rem * 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<div>ООО «<a href="/" class="text-decoration-none link-light">Хекслет Рус</a>»</div>
<div>108813 г. Москва, вн.тер.г. поселение Московский,</div>
<div>г. Московский, ул. Солнечная, д. 3А, стр. 1, помещ. 20Б/3</div>
<div>ОГРН 1217300010476</div>
<div>ИНН 7325174845</div>
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<div>АНО ДПО «<a href="/" class="text-decoration-none link-light">Учебный центр «Хекслет</a>»</div>
<div>119331 г. Москва, вн. тер. г. муниципальный округ</div>
<div>Ломоносовский, пр-кт Вернадского, д. 29</div>
<div>ОГРН 1247700712390</div>
<div>ИНН 7736364948</div>
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