diff --git a/lib/node_modules/@stdlib/ndarray/base/assert/is-data-type-string/lib/main.js b/lib/node_modules/@stdlib/ndarray/base/assert/is-data-type-string/lib/main.js
index b341123c2888..06adaeb207d1 100644
--- a/lib/node_modules/@stdlib/ndarray/base/assert/is-data-type-string/lib/main.js
+++ b/lib/node_modules/@stdlib/ndarray/base/assert/is-data-type-string/lib/main.js
@@ -20,7 +20,8 @@
 
 // MODULES //
 
-var contains = require( '@stdlib/array/base/assert/contains' ).factory;
+var hasOwnProp = require( '@stdlib/assert/has-own-property' );
+var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
 var dtypes = require( '@stdlib/ndarray/base/dtype-strings' );
 
 
@@ -68,10 +69,22 @@ var dtypes = require( '@stdlib/ndarray/base/dtype-strings' );
 * bool = isDataTypeString( 'uint8c' );
 * // returns true
 *
+* var bool = isDataTypeString( 'float64' );
+* // returns true
+*
 * bool = isDataTypeString( 'foo' );
 * // returns false
 */
-var isDataTypeString = contains( dtypes() );
+function isDataTypeString( v ) {
+	return isString( v ) && hasOwnProp( TABLE, v );
+}
+
+var DTYPES = dtypes();
+var TABLE = {};
+
+for ( var i = 0; i < DTYPES.length; i++ ) {
+	TABLE[ DTYPES[ i ] ] = true;
+}
 
 
 // EXPORTS //
diff --git a/lib/node_modules/@stdlib/stats/ztest2/benchmark/benchmark.js b/lib/node_modules/@stdlib/stats/ztest2/benchmark/benchmark.js
index 18e953ee43bc..58cdd1b62f4a 100644
--- a/lib/node_modules/@stdlib/stats/ztest2/benchmark/benchmark.js
+++ b/lib/node_modules/@stdlib/stats/ztest2/benchmark/benchmark.js
@@ -39,14 +39,14 @@ bench( pkg, function benchmark( b ) {
 	var i;
 
 	sigma = stdev( 1.0, 51.0 );
-	x = new Array( 100 );
-	for ( i = 0; i < x.length; i++ ) {
-		x[ i ] = ( randu()*50.0 ) + 1.0;
+	x = [];
+	for ( i = 0; i < 100; i++ ) {
+		x.push( ( randu()*50.0 ) + 1.0 );
 	}
 
-	y = new Array( 120 );
-	for ( i = 0; i < y.length; i++ ) {
-		y[ i ] = ( randu()*50.0 ) + 1.0;
+	y = [];
+	for ( i = 0; i < 120; i++ ) {
+		y.push( ( randu()*50.0 ) + 1.0 );
 	}
 
 	b.tic();
@@ -74,13 +74,13 @@ bench( pkg+'::one-sided', function benchmark( b ) {
 	var i;
 
 	sigma = stdev( 1.0, 51.0 );
-	x = new Array( 100 );
-	for ( i = 0; i < x.length; i++ ) {
-		x[ i ] = ( randu()*50.0 ) + 1.0;
+	x = [];
+	for ( i = 0; i < 100; i++ ) {
+		x.push( ( randu()*50.0 ) + 1.0 );
 	}
-	y = new Array( 120 );
-	for ( i = 0; i < y.length; i++ ) {
-		y[ i ] = ( randu()*50.0 ) + 1.0;
+	y = [];
+	for ( i = 0; i < 120; i++ ) {
+		y.push( ( randu()*50.0 ) + 1.0 );
 	}
 	opts = {
 		'alternative': 'less'
@@ -112,13 +112,13 @@ bench( pkg+':print', function benchmark( b ) {
 	var i;
 
 	sigma = stdev( 1.0, 51.0 );
-	x = new Array( 100 );
-	for ( i = 0; i < x.length; i++ ) {
-		x[ i ] = ( randu()*50.0 ) + 1.0;
+	x = [];
+	for ( i = 0; i < 100; i++ ) {
+		x.push( ( randu()*50.0 ) + 1.0 );
 	}
-	y = new Array( 120 );
-	for ( i = 0; i < y.length; i++ ) {
-		y[ i ] = ( randu()*50.0 ) + 1.0;
+	y = [];
+	for ( i = 0; i < 120; i++ ) {
+		y.push( ( randu()*50.0 ) + 1.0 );
 	}
 	result = ztest2( x, y, sigma, sigma );