diff --git a/lodash.js b/lodash.js
index 8f9723b46..d5fadf1c4 100644
--- a/lodash.js
+++ b/lodash.js
@@ -1128,7 +1128,7 @@
    */
   function first(array, n, guard) {
     if (array) {
-      return (n == undefined || guard) ? array[0] : slice.call(array, 0, n);
+      return (n == null || guard) ? array[0] : slice.call(array, 0, n);
     }
   }
 
@@ -1238,7 +1238,7 @@
     if (!array) {
       return [];
     }
-    return slice.call(array, 0, -((n == undefined || guard) ? 1 : n));
+    return slice.call(array, 0, -((n == null || guard) ? 1 : n));
   }
 
   /**
@@ -1296,7 +1296,7 @@
   function last(array, n, guard) {
     if (array) {
       var length = array.length;
-      return (n == undefined || guard) ? array[length - 1] : slice.call(array, -n || length);
+      return (n == null || guard) ? array[length - 1] : slice.call(array, -n || length);
     }
   }
 
@@ -1511,7 +1511,7 @@
     if (!array) {
       return [];
     }
-    return slice.call(array, (n == undefined || guard) ? 1 : n);
+    return slice.call(array, (n == null || guard) ? 1 : n);
   }
 
   /**
@@ -2255,7 +2255,7 @@
    * // => { 'flavor': 'chocolate', 'sprinkles': 'rainbow' }
    */
   var defaults = createIterator(extendIteratorOptions, {
-    'inLoop': 'if (object[index] == undefined)' + extendIteratorOptions.inLoop
+    'inLoop': 'if (object[index] == null)' + extendIteratorOptions.inLoop
   });
 
   /**
@@ -2525,8 +2525,8 @@
       // treat `+0` vs. `-0` as not equal
       return a !== 0 || (1 / a == 1 / b);
     }
-    // a strict comparison is necessary because `null == undefined`
-    if (a == undefined || b == undefined) {
+    // a strict comparison is necessary because `undefined == null`
+    if (a == null || b == null) {
       return a === b;
     }
     // unwrap any wrapped objects
diff --git a/lodash.min.js b/lodash.min.js
index 0e628ea5a..13cbc90bc 100644
--- a/lodash.min.js
+++ b/lodash.min.js
@@ -4,12 +4,12 @@
 */
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@@ -17,13 +17,13 @@ global==global.global&&(e=global),exports),M=!{valueOf:0}.propertyIsEnumerable("
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