refactor: add instanceof check to increase perf

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---

Author: kgryte

lib/node_modules/@stdlib/ndarray/base/assert/is-data-type-object/lib/main.js

@@ -23,6 +23,7 @@
 var isInteger = require( '@stdlib/assert/is-integer' ).isPrimitive;
 var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
 var hasProp = require( '@stdlib/assert/has-property' );
+var DataType = require( '@stdlib/ndarray/dtype-ctor' );
 
 
 // MAIN //
@@ -47,14 +48,17 @@ var hasProp = require( '@stdlib/assert/has-property' );
 */
 function isDataTypeObject( value ) {
 	return (
-		typeof value === 'object' &&
-		value !== null &&
-		isInteger( value.alignment ) &&
-		isInteger( value.byteLength ) &&
-		isString( value.byteOrder ) &&
-		isString( value.char ) &&
-		isInteger( value.enum ) &&
-		hasProp( value, 'value' )
+		value instanceof DataType ||
+		(
+			typeof value === 'object' &&
+			value !== null &&
+			isInteger( value.alignment ) &&
+			isInteger( value.byteLength ) &&
+			isString( value.byteOrder ) &&
+			isString( value.char ) &&
+			isInteger( value.enum ) &&
+			hasProp( value, 'value' )
+		)
 	);
 }
 

lib/node_modules/@stdlib/ndarray/base/assert/is-data-type-object/test/test.js

@@ -50,6 +50,31 @@ tape( 'the function returns `true` if provided an ndarray data type object', fun
 	t.end();
 });
 
+tape( 'the function returns `true` if provided an ndarray data type-like object', function test( t ) {
+	var values;
+	var bool;
+	var obj;
+	var i;
+
+	obj = {
+		'alignment': 8,
+		'byteLength': 8,
+		'byteOrder': 'host',
+		'char': 'd',
+		'enum': 12,
+		'value': 'float64'
+	};
+
+	values = [
+		obj
+	];
+	for ( i = 0; i < values.length; i++ ) {
+		bool = isDataTypeObject( values[ i ] );
+		t.strictEqual( bool, true, 'returns expected value when provided '+values[ i ] );
+	}
+	t.end();
+});
+
 tape( 'the function returns `false` if not provided an ndarray data type object', function test( t ) {
 	var values;
 	var bool;