2016 Update

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

@@ -0,0 +1,25 @@
+#import system.
+#import system'collections.
+#import extensions.
+
+#symbol program =
+[
+    // Create a queue and "push" items into it
+    #var queue := Queue new.
+
+    queue push:1.
+    queue push:3.
+    queue push:5.
+
+    // "Pop" items from the queue in FIFO order
+    console writeLine:(queue pop). // 1
+    console writeLine:(queue pop). // 3
+    console writeLine:(queue pop). // 5
+
+    // To tell if the queue is empty, we check the count
+    console writeLine:"queue is ":((queue length == 0) iif:"empty":"nonempty").
+
+    // If we try to pop from an empty queue, an exception
+    // is thrown.
+    queue pop | if &Error: e [ console writeLine:"Queue empty.". ].
+].