L.Util.stamp & specs

Leaflet · Sep 6, 2010 · 0eb9cd8 · 0eb9cd8
1 parent 66f44ac
commit 0eb9cd8
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Showing 2 changed files with 30 additions and 4 deletions.
diff --git a/spec/suites/core/UtilSpec.js b/spec/suites/core/UtilSpec.js
@@ -45,4 +45,23 @@ describe('L.Util', function() {
 			expect(fn2()).toEqual(5);
 		});
 	});
+
+	describe('#stamp', function() {
+		it('should set a unique id on the given object and return it', function() {
+			var a = {},
+				id = L.Util.stamp(a);
+
+			expect(typeof a.id).toEqual('number');
+			expect(a.id).toEqual(id);
+
+			L.Util.stamp(a);
+
+			expect(a.id).toEqual(id);
+
+			var b = {},
+				id2 = L.Util.stamp(b);
+
+			expect(id2).not.toEqual(id);
+		});
+	});
 });
diff --git a/src/core/Util.js b/src/core/Util.js
@@ -5,9 +5,8 @@
 L.Util = {};
 
 L.Util.extend = function(/*Object*/ dest) /*-> Object*/ {	// merge src properties into dest
-	var sources = Array.prototype.slice.call(arguments, 1),
-		src;
-	for (var j = 0, len = sources.length; j < len; j++) {
+	var sources = Array.prototype.slice.call(arguments, 1);
+	for (var j = 0, len = sources.length, src; j < len; j++) {
 		src = sources[j] || {};
 		for (var i in src) {
 			if (src.hasOwnProperty(i)) {
@@ -22,4 +21,12 @@ L.Util.bind = function(/*Function*/ fn, /*Object*/ obj) /*-> Object*/ {
 	return function() {
 		return fn.apply(obj, arguments);
 	};
-};
+};
+
+L.Util.stamp = (function() {
+	var lastId = 0;
+	return function(/*Object*/ obj) {
+		obj.id = obj.id || ++lastId;
+		return obj.id;
+	};
+})();