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

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." }
}