Data commit

Task/Queue-Usage/Elena/queue-usage.elena

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+import system'collections;
+import extensions;
+
+public program()
+{
+    // Create a queue and "push" items into it
+    var queue := new Queue();
+
+    queue.push:1;
+    queue.push:3;
+    queue.push:5;
+
+    // "Pop" items from the queue in FIFO order
+    console.printLine(queue.pop()); // 1
+    console.printLine(queue.pop()); // 3
+    console.printLine(queue.pop()); // 5
+
+    // To tell if the queue is empty, we check the count
+    console.printLine("queue is ",(queue.Length == 0).iif("empty","nonempty"));
+
+    // If we try to pop from an empty queue, an exception
+    // is thrown.
+    queue.pop() | on:(e){ console.writeLine:"Queue empty." }
+}