Replace isArray helper with native Array.isArray

src/core/asymmetric_equality/ArrayContaining.js

@@ -6,7 +6,7 @@ getJasmineRequireObj().ArrayContaining = function(j$) {
   }
 
   ArrayContaining.prototype.asymmetricMatch = function(other, matchersUtil) {
-    if (!j$.private.isArray(this.sample)) {
+    if (!Array.isArray(this.sample)) {
       throw new Error(
         'You must provide an array to arrayContaining, not ' +
           j$.private.basicPrettyPrinter(this.sample) +
@@ -17,7 +17,7 @@ getJasmineRequireObj().ArrayContaining = function(j$) {
     // If the actual parameter is not an array, we can fail immediately, since it couldn't
     // possibly be an "array containing" anything. However, we also want an empty sample
     // array to match anything, so we need to double-check we aren't in that case
-    if (!j$.private.isArray(other) && this.sample.length > 0) {
+    if (!Array.isArray(other) && this.sample.length > 0) {
       return false;
     }
 

src/core/asymmetric_equality/ArrayWithExactContents.js

@@ -9,7 +9,7 @@ getJasmineRequireObj().ArrayWithExactContents = function(j$) {
     other,
     matchersUtil
   ) {
-    if (!j$.private.isArray(this.sample)) {
+    if (!Array.isArray(this.sample)) {
       throw new Error(
         'You must provide an array to arrayWithExactContents, not ' +
           j$.private.basicPrettyPrinter(this.sample) +

src/core/asymmetric_equality/Empty.js

@@ -6,7 +6,7 @@ getJasmineRequireObj().Empty = function(j$) {
   Empty.prototype.asymmetricMatch = function(other) {
     if (
       j$.private.isString(other) ||
-      j$.private.isArray(other) ||
+      Array.isArray(other) ||
       j$.private.isTypedArray(other)
     ) {
       return other.length === 0;

src/core/asymmetric_equality/NotEmpty.js

@@ -6,7 +6,7 @@ getJasmineRequireObj().NotEmpty = function(j$) {
   NotEmpty.prototype.asymmetricMatch = function(other) {
     if (
       j$.private.isString(other) ||
-      j$.private.isArray(other) ||
+      Array.isArray(other) ||
       j$.private.isTypedArray(other)
     ) {
       return other.length !== 0;