Clone with multiple args

lib/deap.js

@@ -15,7 +15,9 @@ module.exports = {
 function clone(val) {
 	switch(typeOf(val)) {
 		case 'object':
-			return extend({}, val);
+			var args = slice.call(arguments);
+			args.unshift({});
+			return extend.apply(null, args);
 		case 'array':
 			return [].concat(val);
 		case 'date':
@@ -30,15 +32,13 @@ function clone(val) {
 function deepClone(val) {
 	switch(typeOf(val)) {
 		case 'object':
-			return deepExtend({}, val);
+			var args = slice.call(arguments);
+			args.unshift({});
+			return deepExtend.apply(null, args);
 		case 'array':
-			return val.map(deepClone);
-		case 'date':
-			return new Date(val.getTime());
-		case 'regexp':
-			return new RegExp(val);
+			return val.map(function(v) { return deepClone(v); });
 		default:
-			return val;
+			return clone(val);
 	}
 }
 
@@ -85,7 +85,7 @@ function deepUpdate(a, b /*, [b2..n] */) {
 					deepUpdate(ap, bp);
 				else if(tb === 'array' && ta === 'array') {
 					ap.length = 0;
-					ap.push.apply(ap, bp.map(deepClone));
+					ap.push.apply(ap, bp.map(function(v) { return deepClone(v); }));
 				} else
 					a[p] = deepClone(bp);
 			}

test/clone.test.js

@@ -76,6 +76,23 @@ describe('shallow clone', function() {
 		assert.notStrictEqual(result, a);
 	});
 
+	it('should work for multiple arguments', function() {
+		var a = { doom: 'song' },
+			b = { burp: 'adurp' },
+			c = { grr: { doh: 'argh' } };
+
+		var result = shallow(a, b, c);
+
+		assert.deepEqual(a, { doom: 'song' });
+		assert.deepEqual(b, { burp: 'adurp' });
+		assert.deepEqual(c, { grr: { doh: 'argh' } });
+		assert.sameMembers(Object.keys(result), ['doom', 'burp', 'grr']);
+		assert.equal(result.doom, a.doom);
+		assert.equal(result.burp, b.burp);
+		assert.deepEqual(result.grr, c.grr);
+		assert.strictEqual(result.grr, c.grr);
+	});
+
 	describe('on an array', function() {
 
 		it('should preserve references', function() {
@@ -186,6 +203,23 @@ describe('clone', function() {
 		assert.notStrictEqual(result, a);
 	});
 
+	it('should work for multiple arguments', function() {
+		var a = { doom: 'song' },
+			b = { burp: 'adurp' },
+			c = { grr: { doh: 'argh' } };
+
+		var result = clone(a, b, c);
+
+		assert.deepEqual(a, { doom: 'song' });
+		assert.deepEqual(b, { burp: 'adurp' });
+		assert.deepEqual(c, { grr: { doh: 'argh' } });
+		assert.sameMembers(Object.keys(result), ['doom', 'burp', 'grr']);
+		assert.equal(result.doom, a.doom);
+		assert.equal(result.burp, b.burp);
+		assert.deepEqual(result.grr, c.grr);
+		assert.notStrictEqual(result.grr, c.grr);
+	});
+
 	describe('on an array', function() {
 
 		it('should not preserve references', function() {