ES6: Map.prototype.clear

emberjs · Sep 27, 2014 · 11544cc · 11544cc
1 parent f4ea673
commit 11544cc
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diff --git a/packages/ember-metal/lib/map.js b/packages/ember-metal/lib/map.js
@@ -409,6 +409,15 @@ Map.prototype = {
     this.keys.forEach(cb);
   },
 
+  /**
+    @method clear
+  */
+  clear: function() {
+    this.keys.clear();
+    this.values = Object.create(null);
+    this.size = 0;
+  },
+
   /**
     @method copy
     @return {Ember.Map}

diff --git a/packages/ember-metal/tests/map_test.js b/packages/ember-metal/tests/map_test.js
@@ -387,6 +387,30 @@ function testMap(nameAndFunc) {
 
     equal(iteration, 4, 'expected 3 iterations');
   });
+
+  test("clear", function() {
+    var iterations = 0;
+
+    map.set("a", 1);
+    map.set("b", 2);
+    map.set("c", 3);
+    map.set("d", 4);
+
+    equal(map.size, 4);
+
+    map.forEach(function() {
+      iterations++;
+    });
+    equal(iterations, 4);
+
+    map.clear();
+    equal(map.size, 0);
+    iterations = 0;
+    map.forEach(function() {
+      iterations++;
+    });
+    equal(iterations, 0);
+  });
 }
 
 for (var i = 0;  i < varieties.length;  i++) {