Add multilingual language and systems learning tracks

en/ruby-practice-20261101/lesson-1/lesson.html

@@ -0,0 +1,5 @@
+<!doctype html><html lang="en"><meta charset="utf-8"><title>Collections and repeated work</title><h1>Collections and repeated work</h1><p>15-minute session: read for 3 minutes, trace for 3, experiment for 7, and complete the check for 2. Spend longer whenever you need.</p><p>A collection stores related values. The loop visits 1, 2, and 3, updating the total from 0 to 1, then 3, then 6. Record this trace rather than guessing. Identify the first and last valid positions in this language: Pascal can declare a 1-based array, while many other examples use zero-based containers. Add another value and update the bounds correctly. Explain what an empty collection should produce.</p><p><code>puts</code> prints a line. <code>def</code> and <code>end</code> delimit a method. <code>each</code> yields values to a block. An instance variable beginning with <code>@</code> belongs to an object; two objects can hold different values.</p><pre><code class="language-ruby">minutes = [1, 2, 3]
+total = 0
+minutes.each { |value| total += value }
+puts total
+</code></pre><p><strong>Expected result:</strong> <code>6</code></p><h3>Practice and evidence</h3><p>Keep three notes: your prediction, the actual result, and why they match or differ. The completion check grades understanding; the practice task builds skill.</p><p><a href="https://www.ruby-lang.org/en/documentation/">Language reference</a></p></html>

en/ruby-practice-20261101/lesson-1/main.rb

@@ -0,0 +1,4 @@
+minutes = [1, 2, 3]
+total = 0
+minutes.each { |value| total += value }
+puts total