Add multilingual language and systems learning tracks

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

@@ -0,0 +1,8 @@
+<!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>:=</code> declares a value. Add <code>mut</code> only when it must change. <code>!int</code> describes a result that may fail; the caller handles the failure with an <code>or</code> block. Standard V examples do not import the Agila SDK.</p><pre><code class="language-vlang">
+fn main() {
+    minutes := [1, 2, 3]
+    mut total := 0
+    for value in minutes { total += value }
+    println(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://docs.vlang.io/">Language reference</a></p></html>