refactor: use assertion utility

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---

Author: kgryte

lib/node_modules/@stdlib/ndarray/base/ndims/lib/main.js

@@ -18,6 +18,11 @@
 
 'use strict';
 
+// MODULES //
+
+var isNumber = require( '@stdlib/assert/is-number' ).isPrimitive;
+
+
 // MAIN //
 
 /**
@@ -34,7 +39,7 @@
 */
 function ndims( x ) {
 	var n = x.ndims; // Note: intentionally cache in case `ndims` is lazily resolved via accessor
-	if ( typeof n === 'number' ) {
+	if ( isNumber( n ) ) {
 		return n;
 	}
 	return x.shape.length;