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node_modules/dir-compare/build/src/fs/Queue.js

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+/*
+
+Queue.js
+
+A function to represent a queue
+
+Created by Kate Morley - http://code.iamkate.com/ - and released under the terms
+of the CC0 1.0 Universal legal code:
+
+http://creativecommons.org/publicdomain/zero/1.0/legalcode
+
+*/
+const MAX_UNUSED_ARRAY_SIZE = 10000;
+/* Creates a new queue. A queue is a first-in-first-out (FIFO) data structure -
+ * items are added to the end of the queue and removed from the front.
+ */
+function Queue() {
+    // initialise the queue and offset
+    let queue = [];
+    let offset = 0;
+    // Returns the length of the queue.
+    this.getLength = () => (queue.length - offset);
+    /* Enqueues the specified item. The parameter is:
+     *
+     * item - the item to enqueue
+     */
+    this.enqueue = item => {
+        queue.push(item);
+    };
+    /* Dequeues an item and returns it. If the queue is empty, the value
+     * 'undefined' is returned.
+     */
+    this.dequeue = () => {
+        // if the queue is empty, return immediately
+        if (queue.length === 0) {
+            return undefined;
+        }
+        // store the item at the front of the queue
+        const item = queue[offset];
+        // increment the offset and remove the free space if necessary
+        if (++offset > MAX_UNUSED_ARRAY_SIZE) {
+            queue = queue.slice(offset);
+            offset = 0;
+        }
+        // return the dequeued item
+        return item;
+    };
+}
+module.exports = Queue;
+//# sourceMappingURL=Queue.js.map