Removing LRUItem class, creating clone() & dump(), cloning valu…

…es on `set()` & `get()` so the cache is pristine, adding tests

README.md

@@ -8,6 +8,34 @@ Least Recently Used cache for Client or Server.
 var cache = lru(500);
 ```
 
+## clone
+### Method
+
+Clones a value; called when setting cache value
+
+	return {Mixed} Clone of input
+
+**Example**
+
+```javascript
+cache.clone({abc: true});
+```
+
+## dump
+### Method
+
+Produces a dump of the cache as JSON or a clone
+
+	param  {String} string Defaults to `true`
+	return {Mixed}  String or Object
+
+**Example**
+
+```javascript
+cache.dump();      // JSON
+cache.dump(false); // Object
+```
+
 ## evict
 ### Method
 

lib/tiny-lru.es6.js

@@ -5,18 +5,10 @@
  * @copyright 2016
  * @license BSD-3-Clause
  * @link https://github.com/avoidwork/tiny-lru
- * @version 1.1.0
+ * @version 1.2.0
  */
 (function (global) {
 
-class LRUItem {
-	constructor (value) {
-		this.next = null;
-		this.previous = null;
-		this.value = value;
-	}
-}
-
 class LRU {
 	constructor (max) {
 		this.cache = {};
@@ -26,6 +18,18 @@ class LRU {
 		this.length = 0;
 	}
 
+	clone (arg) {
+		let output;
+
+		if (typeof arg !== "function") {
+			output = JSON.parse(JSON.stringify(arg, null, 0));
+		} else {
+			output = arg;
+		}
+
+		return output;
+	}
+
 	delete (key) {
 		return this.remove(key);
 	}
@@ -38,12 +42,16 @@ class LRU {
 		return this;
 	}
 
+	dump (string = true) {
+		return string ? JSON.stringify(this, null, 0) : this.clone(this);
+	}
+
 	get (key) {
 		let cached = this.cache[key],
 			output;
 
 		if (cached) {
-			output = cached.value;
+			output = this.clone(cached.value);
 			this.set(key, cached.value);
 		}
 
@@ -85,9 +93,13 @@ class LRU {
 		let obj = this.remove(key);
 
 		if (!obj) {
-			obj = new LRUItem(value);
+			obj = {
+				next: null,
+				previous: null,
+				value: this.clone(value)
+			};
 		} else {
-			obj.value = value;
+			obj.value = this.clone(value);
 		}
 
 		obj.next = null;

lib/tiny-lru.js

@@ -11,17 +11,9 @@ function _classCallCheck(instance, Constructor) { if (!(instance instanceof Cons
  * @copyright 2016
  * @license BSD-3-Clause
  * @link https://github.com/avoidwork/tiny-lru
- * @version 1.1.0
+ * @version 1.2.0
  */
 (function (global) {
-	var LRUItem = function LRUItem(value) {
-		_classCallCheck(this, LRUItem);
-
-		this.next = null;
-		this.previous = null;
-		this.value = value;
-	};
-
 	var LRU = function () {
 		function LRU(max) {
 			_classCallCheck(this, LRU);
@@ -34,6 +26,19 @@ function _classCallCheck(instance, Constructor) { if (!(instance instanceof Cons
 		}
 
 		_createClass(LRU, [{
+			key: "clone",
+			value: function clone(arg) {
+				var output = void 0;
+
+				if (typeof arg !== "function") {
+					output = JSON.parse(JSON.stringify(arg, null, 0));
+				} else {
+					output = arg;
+				}
+
+				return output;
+			}
+		}, {
 			key: "delete",
 			value: function _delete(key) {
 				return this.remove(key);
@@ -47,14 +52,21 @@ function _classCallCheck(instance, Constructor) { if (!(instance instanceof Cons
 
 				return this;
 			}
+		}, {
+			key: "dump",
+			value: function dump() {
+				var string = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : true;
+
+				return string ? JSON.stringify(this, null, 0) : this.clone(this);
+			}
 		}, {
 			key: "get",
 			value: function get(key) {
 				var cached = this.cache[key],
-				    output = undefined;
+				    output = void 0;
 
 				if (cached) {
-					output = cached.value;
+					output = this.clone(cached.value);
 					this.set(key, cached.value);
 				}
 
@@ -99,9 +111,13 @@ function _classCallCheck(instance, Constructor) { if (!(instance instanceof Cons
 				var obj = this.remove(key);
 
 				if (!obj) {
-					obj = new LRUItem(value);
+					obj = {
+						next: null,
+						previous: null,
+						value: this.clone(value)
+					};
 				} else {
-					obj.value = value;
+					obj.value = this.clone(value);
 				}
 
 				obj.next = null;
@@ -130,7 +146,7 @@ function _classCallCheck(instance, Constructor) { if (!(instance instanceof Cons
 	}();
 
 	function factory() {
-		var max = arguments.length <= 0 || arguments[0] === undefined ? 1000 : arguments[0];
+		var max = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 1000;
 
 		return new LRU(max);
 	}