1 files changed, 7 insertions, 7 deletions
diff --git a/lib/assert.js b/lib/assert.js
index a13cc50316..5cd75b220a 100644
--- a/lib/assert.js
+++ b/lib/assert.js
@@ -59,7 +59,7 @@ assert.AssertionError = function AssertionError(options) {
 util.inherits(assert.AssertionError, Error);
 
 function truncate(s, n) {
-  if (util.isString(s)) {
+  if (typeof s === 'string') {
     return s.length < n ? s : s.slice(0, n);
   } else {
     return s;
@@ -138,8 +138,7 @@ function _deepEqual(actual, expected) {
   // 7.1. All identical values are equivalent, as determined by ===.
   if (actual === expected) {
     return true;
-
-  } else if (util.isBuffer(actual) && util.isBuffer(expected)) {
+  } else if (actual instanceof Buffer && expected instanceof Buffer) {
     if (actual.length != expected.length) return false;
 
     for (var i = 0; i < actual.length; i++) {
@@ -165,7 +164,8 @@ function _deepEqual(actual, expected) {
 
   // 7.4. Other pairs that do not both pass typeof value == 'object',
   // equivalence is determined by ==.
-  } else if (!util.isObject(actual) && !util.isObject(expected)) {
+  } else if ((actual === null || typeof actual !== 'object') &&
+             (expected === null || typeof expected !== 'object')) {
     return actual == expected;
 
   // 7.5 For all other Object pairs, including Array objects, equivalence is
@@ -184,7 +184,7 @@ function isArguments(object) {
 }
 
 function objEquiv(a, b) {
-  if (util.isNullOrUndefined(a) || util.isNullOrUndefined(b))
+  if (a === null || a === undefined || b === null || b === undefined)
     return false;
   // an identical 'prototype' property.
   if (a.prototype !== b.prototype) return false;
@@ -270,11 +270,11 @@ function expectedException(actual, expected) {
 function _throws(shouldThrow, block, expected, message) {
   var actual;
 
-  if (!util.isFunction(block)) {
+  if (typeof block !== 'function') {
     throw new TypeError('block must be a function');
   }
 
-  if (util.isString(expected)) {
+  if (typeof expected === 'string') {
     message = expected;
     expected = null;
   }