diff --git a/build.js b/build.js
index f402d37d0..f890a13e5 100755
--- a/build.js
+++ b/build.js
@@ -28,6 +28,7 @@
   var aliasToRealMap = {
     'all': 'every',
     'any': 'some',
+    'assign': 'extend',
     'collect': 'map',
     'detect': 'find',
     'drop': 'rest',
@@ -48,6 +49,7 @@
   var realToAliasMap = {
     'contains': ['include'],
     'every': ['all'],
+    'extend': ['assign'],
     'filter': ['select'],
     'find': ['detect'],
     'first': ['head', 'take'],
@@ -229,6 +231,7 @@
 
   /** List of methods used by Underscore */
   var underscoreMethods = _.without.apply(_, [allMethods].concat([
+    'assign',
     'forIn',
     'forOwn',
     'isPlainObject',
@@ -615,13 +618,10 @@
     var modified,
         snippet = matchFunction(source, funcName);
 
-    // exit early if function is not found
-    if (!snippet) {
-      return source;
-    }
     // remove function
-    source = source.replace(snippet, '');
-
+    if (snippet) {
+      source = source.replace(snippet, '');
+    }
     // grab the method assignments snippet
     snippet = getMethodAssignments(source);
 
@@ -947,7 +947,8 @@
     var useUnderscoreClone = isUnderscore;
 
     // flags used to specify exposing Lo-Dash methods in an Underscore build
-    var exposeForIn = !isUnderscore,
+    var exposeAssign = !isUnderscore,
+        exposeForIn = !isUnderscore,
         exposeForOwn = !isUnderscore,
         exposeIsPlainObject = !isUnderscore;
 
@@ -969,6 +970,20 @@
           : accumulator;
       }, []);
 
+      // add method names explicitly
+      options.some(function(value) {
+        return /include/.test(value) &&
+          (result = getDependencies(optionToMethodsArray(source, value)));
+      });
+
+      // include Lo-Dash's methods if explicitly requested
+      if (isUnderscore && result) {
+        exposeAssign = result.indexOf('assign') > -1;
+        exposeForIn = result.indexOf('forIn') > -1;
+        exposeForOwn = result.indexOf('forOwn') > -1;
+        exposeIsPlainObject = result.indexOf('isPlainObject') > -1;
+        useUnderscoreClone = result.indexOf('clone') < 0;
+      }
       // update dependencies
       if (isMobile) {
         dependencyMap.reduceRight = ['forEach', 'keys'];
@@ -986,19 +1001,6 @@
           dependencyMap.clone = ['extend', 'isArray'];
         }
       }
-      // add method names explicitly
-      options.some(function(value) {
-        return /include/.test(value) &&
-          (result = getDependencies(optionToMethodsArray(source, value)));
-      });
-
-      // include Lo-Dash's methods if explicitly requested
-      if (result) {
-        exposeForIn = result.indexOf('forIn') > -1;
-        exposeForOwn = result.indexOf('forOwn') > -1;
-        exposeIsPlainObject = result.indexOf('isPlainObject') > -1;
-        useUnderscoreClone = result.indexOf('clone') < 0;
-      }
       // add method names required by Backbone and Underscore builds
       if (isBackbone && !result) {
         result = getDependencies(backboneDependencies);
@@ -1106,6 +1108,24 @@
           '  }'
         ].join('\n'));
 
+        // replace `_.extend`
+        source = source.replace(/^( *)var extend *= *createIterator[\s\S]+?\);/m, [
+          '  function extend(object) {',
+          '    if (!object) {',
+          '      return object;',
+          '    }',
+          '    for (var argsIndex = 1, argsLength = arguments.length; argsIndex < argsLength; argsIndex++) {',
+          '      var iteratee = arguments[argsIndex];',
+          '      if (iteratee) {',
+          '        for (var key in iteratee) {',
+          '          object[key] = iteratee[key];',
+          '        }',
+          '      }',
+          '    }',
+          '    return object;',
+          '  }'
+        ].join('\n'));
+
         // replace `_.intersection`
         source = source.replace(/^( *)function intersection[\s\S]+?\n\1}/m, [
           '  function intersection(array) {',
@@ -1289,6 +1309,9 @@
         }
       });
 
+      if (!exposeAssign) {
+        source = removeFunction(source, 'assign');
+      }
       // remove `isArguments` fallback before `isArguments` is transformed by
       // other parts of the build process
       if (isRemoved(source, 'isArguments')) {
diff --git a/build/pre-compile.js b/build/pre-compile.js
index 1c13cef96..d692e657b 100644
--- a/build/pre-compile.js
+++ b/build/pre-compile.js
@@ -13,6 +13,7 @@
     'collection',
     'createCallback',
     'ctor',
+    'guard',
     'hasOwnProperty',
     'index',
     'isArguments',
@@ -27,6 +28,7 @@
     'propertyIsEnumerable',
     'result',
     'skipProto',
+    'source',
     'thisArg',
     'value'
   ];
@@ -63,6 +65,7 @@
     'all',
     'amd',
     'any',
+    'assign',
     'attachEvent',
     'bind',
     'bindAll',
@@ -212,7 +215,7 @@
       return source;
     }
 
-    // remove copyright to add later in post-compile.js
+    // remove copyright/license header to add later in post-compile.js
     source = source.replace(/\/\*![\s\S]+?\*\//, '');
 
     // add brackets to whitelisted properties so the Closure Compiler won't mung them
diff --git a/lodash.js b/lodash.js
index c8fa41289..7a4341277 100644
--- a/lodash.js
+++ b/lodash.js
@@ -430,10 +430,10 @@
   /** Reusable iterator options for `defaults`, and `extend` */
   var extendIteratorOptions = {
     'useHas': false,
-    'args': 'object',
+    'args': 'object, source, guard',
     'top':
-      'for (var argsIndex = 1, argsLength = arguments.length; argsIndex < argsLength; argsIndex++) {\n' +
-      '  if (iteratee = arguments[argsIndex]) {',
+      'for (var argsIndex = 1, argsLength = typeof guard == \'number\' ? 2 : arguments.length; argsIndex < argsLength; argsIndex++) {\n' +
+      '  if ((iteratee = arguments[argsIndex])) {',
     'objectLoop': 'result[index] = value',
     'bottom': '  }\n}'
   };
@@ -987,6 +987,7 @@
    *
    * @static
    * @memberOf _
+   * @alias assign
    * @category Objects
    * @param {Object} object The destination object.
    * @param {Object} [source1, source2, ...] The source objects.
@@ -4176,6 +4177,7 @@
   // assign aliases
   lodash.all = every;
   lodash.any = some;
+  lodash.assign = extend;
   lodash.collect = map;
   lodash.detect = find;
   lodash.drop = rest;
diff --git a/lodash.min.js b/lodash.min.js
index fac7f1919..b5135cb2d 100644
--- a/lodash.min.js
+++ b/lodash.min.js
@@ -4,8 +4,8 @@
 */
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+Y.call(e,t))return!1;return!0},n.isEqual=d,n.isFinite=function(e){return it(e)&&tt.call(e)==ht},n.isFunction=v,n.isNaN=function(e){return tt.call(e)==ht&&e!=+e},n.isNull=function(e){return null===e},n.isNumber=function(e){return tt.call(e)==ht},n.isObject=m,n.isRegExp=function(e){return tt.call(e)==dt},n.isString=g,n.isUndefined=function(e){return e===t},n.keys=Ct,n.last=function(e,t,n){if(e){var r=e.length;return null==t||n?e[r-1]:et.call(e,-t||r)}},n.lastIndexOf=function(e,t,n){var r=e?e.length
+:0;for("number"==typeof n&&(r=(0>n?ot(0,r+n):ut(n,r-1))+1);r--;)if(e[r]===t)return r;return-1},n.map=x,n.max=T,n.memoize=function(e,t){var n={};return function(){var r=t?t.apply(this,arguments):arguments[0];return Y.call(n,r)?n[r]:n[r]=e.apply(this,arguments)}},n.min=function(e,t,n){var r=Infinity,i=-1,o=e?e.length:0,u=r;if(t||!Nt(e))t=s(t,n),kt(e,function(e,n,i){n=t(e,n,i),n<r&&(r=n,u=e)});else for(;++i<o;)e[i]<u&&(u=e[i]);return u},n.mixin=j,n.noConflict=function(){return e._=z,this},n.object=function(
+e,t){for(var n=-1,r=e?e.length:0,i={};++n<r;){var s=e[n];t?i[s]=t[n]:i[s[0]]=s[1]}return i},n.omit=function(e){var t=Q.apply(q,arguments),n={};return wt(e,function(e,r){0>M(t,r,1)&&(n[r]=e)}),n},n.once=function(e){var t,n=!1;return function(){return n?t:(n=!0,t=e.apply(this,arguments),e=null,t)}},n.pairs=function(e){var t=[];return Et(e,function(e,n){t.push([n,e])}),t},n.pick=function(e){for(var t=0,n=Q.apply(q,arguments),r=n.length,i={};++t<r;){var s=n[t];s in e&&(i[s]=e[s])}return i},n.pluck=N,
+n.random=function(e,t){return null==e&&null==t&&(t=1),e=+e||0,null==t&&(t=e,e=0),e+G(at()*((+t||0)-e+1))},n.range=function(e,t,n){e=+e||0,n=+n||1,null==t&&(t=e,e=0);for(var r=-1,t=ot(0,K((t-e)/n)),i=Array(t);++r<t;)i[r]=e,e+=n;return i},n.reduce=C,n.reduceRight=k,n.reject=function(e,t,n){return t=s(t,n),E(e,function(e,n,r){return!t(e,n,r)})},n.rest=_,n.result=function(e,t){var n=e?e[t]:null;return v(n)?e[t]():n},n.shuffle=function(e){var t=-1,n=Array(e?e.length:0);return kt(e,function(e){var r=G(
+at()*(++t+1));n[t]=n[r],n[r]=e}),n},n.size=function(e){var t=e?e.length:0;return"number"==typeof t?t:Ct(e).length},n.some=L,n.sortBy=function(e,t,n){var i=[],t=s(t,n);kt(e,function(e,n,r){i.push({a:t(e,n,r),b:n,c:e})}),e=i.length;for(i.sort(r);e--;)i[e]=i[e].c;return i},n.sortedIndex=D,n.tap=function(e,t){return t(e),e},n.template=function(e,t,r){e||(e="");var r=Tt({},r,n.templateSettings),i=0,s="__p += '",u=r.variable;e.replace(RegExp((r.escape||V).source+"|"+(r.interpolate||V).source+"|"+(r.evaluate||
+V).source+"|$","g"),function(t,n,r,u,a){s+=e.slice(i,a).replace(J,o),s+=n?"'+_['escape']("+n+")+'":u?"';"+u+";__p+='":r?"'+((__t=("+r+"))==null?'':__t)+'":"",i=a+t.length}),s+="';",u||(u="obj",s="with("+u+"||{}){"+s+"}"),s="function("+u+"){var __t,__p='',__j=Array.prototype.join;function print(){__p+=__j.call(arguments,'')}"+s+"return __p}";try{var a=Function("_","return "+s)(n)}catch(f){throw f.source=s,f}return t?a(t):(a.source=s,a)},n.throttle=function(e,t){function n(){u=new Date,o=null,i=e.apply
+(s,r)}var r,i,s,o,u=0;return function(){var a=new Date,f=t-(a-u);return r=arguments,s=this,0>=f?(clearTimeout(o),u=a,i=e.apply(s,r)):o||(o=setTimeout(n,f)),i}},n.times=function(e,t,n){for(var e=+e||0,r=-1,i=Array(e);++r<e;)i[r]=t.call(n,r);return i},n.toArray=function(e){return e&&"number"==typeof e.length?"string"==typeof e?e.split(""):et.call(e):y(e)},n.unescape=function(e){return null==e?"":(e+"").replace(W,f)},n.union=function(){return P(Q.apply(q,arguments))},n.uniq=P,n.uniqueId=function(e){
+var t=R++;return e?e+t:t},n.values=y,n.where=function(e,t){var n=[];return wt(t,function(e,t){n.push(t)}),E(e,function(e){for(var r=n.length;r--;){var i=e[n[r]]===t[n[r]];if(!i)break}return!!i})},n.without=function(e){for(var t=-1,n=e.length,r=[];++t<n;){var i=e[t];0>M(arguments,i,1)&&r.push(i)}return r},n.wrap=function(e,t){return function(){var n=[e];return Z.apply(n,arguments),t.apply(this,n)}},n.zip=function(e){for(var t=-1,n=e?T(N(arguments,"length")):0,r=Array(n);++t<n;)r[t]=N(arguments,t);
+return r},n.all=w,n.any=L,n.collect=x,n.detect=S,n.drop=_,n.each=kt,n.foldl=C,n.foldr=k,n.head=A,n.include=b,n.inject=C,n.methods=h,n.select=E,n.tail=_,n.take=A,n.unique=P,j(n),n.prototype.chain=function(){return this.__chain__=!0,this},n.prototype.value=function(){return this.__wrapped__},kt("pop push reverse shift sort splice unshift".split(" "),function(e){var t=q[e];n.prototype[e]=function(){var e=this.__wrapped__;return t.apply(e,arguments),mt&&e.length===0&&delete e[0],this.__chain__&&(e=new 
+n(e),e.__chain__=!0),e}}),kt(["concat","join","slice"],function(e){var t=q[e];n.prototype[e]=function(){var e=t.apply(this.__wrapped__,arguments);return this.__chain__&&(e=new n(e),e.__chain__=!0),e}}),F?"object"==typeof module&&module&&module.exports==F?(module.exports=n)._=n:F._=n:e._=n})(this);
\ No newline at end of file
diff --git a/test/test-build.js b/test/test-build.js
index 84fbf9d68..f72bd3b69 100644
--- a/test/test-build.js
+++ b/test/test-build.js
@@ -18,6 +18,7 @@
   var aliasToRealMap = {
     'all': 'every',
     'any': 'some',
+    'assign': 'extend',
     'collect': 'map',
     'detect': 'find',
     'drop': 'rest',
@@ -38,6 +39,7 @@
   var realToAliasMap = {
     'contains': ['include'],
     'every': ['all'],
+    'extend': ['assign'],
     'filter': ['select'],
     'find': ['detect'],
     'first': ['head', 'take'],
@@ -144,6 +146,7 @@
 
   /** List of "Objects" category methods */
   var objectsMethods = [
+    'assign',
     'clone',
     'defaults',
     'extend',
@@ -239,6 +242,7 @@
 
   /** List of methods used by Underscore */
   var underscoreMethods = _.without.apply(_, [allMethods].concat([
+    'assign',
     'forIn',
     'forOwn',
     'isPlainObject',
@@ -694,6 +698,7 @@
         var lodash = context._;
 
         _.each([
+          'assign',
           'forIn',
           'forOwn',
           'isPlainObject',
@@ -701,7 +706,7 @@
           'merge',
           'partial'
         ], function(methodName) {
-          equal(lodash[methodName], undefined, '_.' + methodName + ' exists: ' + basename);
+          equal(lodash[methodName], undefined, '_.' + methodName + ' should not exist: ' + basename);
         });
 
         start();
@@ -993,7 +998,9 @@
         build(['--silent'].concat(command.split(' ')), function(source, filePath) {
           var methodNames,
               basename = path.basename(filePath, '.js'),
-              context = createContext();
+              context = createContext(),
+              isUnderscore = /underscore/.test(command),
+              exposeAssign = !isUnderscore;
 
           try {
             vm.runInContext(source, context);
@@ -1008,8 +1015,12 @@
           if (/backbone/.test(command) && !methodNames) {
             methodNames = backboneDependencies.slice();
           }
-          if (/underscore/.test(command) && !methodNames) {
-            methodNames = underscoreMethods.slice();
+          if (isUnderscore) {
+            if (methodNames) {
+              exposeAssign = methodNames.indexOf('assign') > -1;
+            } else {
+              methodNames = underscoreMethods.slice();
+            }
           }
           // add method names explicitly by category
           if (/category/.test(command)) {
@@ -1043,6 +1054,9 @@
           // remove nonexistent and duplicate method names
           methodNames = _.uniq(_.intersection(allMethods, expandMethodNames(methodNames)));
 
+          if (!exposeAssign) {
+            methodNames = _.without(methodNames, 'assign');
+          }
           var lodash = context._ || {};
           methodNames.forEach(function(methodName) {
             testMethod(lodash, methodName, basename);
diff --git a/test/test.js b/test/test.js
index fad3b7caf..e148ad02d 100644
--- a/test/test.js
+++ b/test/test.js
@@ -409,6 +409,14 @@
       Foo.prototype = { 'c': 3 };
       deepEqual(_.extend({}, Foo), expected);
     });
+
+    test('should work with `_.reduce`', function() {
+      var actual = { 'a': 1},
+          array = [{ 'b': 2 }, { 'c': 3 }];
+
+      _.reduce(array, _.extend, actual);
+      deepEqual(actual, { 'a': 1, 'b': 2, 'c': 3});
+    });
   }());
 
   /*--------------------------------------------------------------------------*/