refactor: use explicit utility for returning the rank of an array

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---

Author: kgryte

lib/node_modules/@stdlib/blas/ext/join/lib/main.js

@@ -28,6 +28,7 @@ var maybeBroadcastArray = require( '@stdlib/ndarray/base/maybe-broadcast-array'
 var nonCoreShape = require( '@stdlib/ndarray/base/complement-shape' );
 var getShape = require( '@stdlib/ndarray/shape' );
 var getOrder = require( '@stdlib/ndarray/order' );
+var ndims = require( '@stdlib/ndarray/base/ndims' );
 var format = require( '@stdlib/string/format' );
 var base = require( './base.js' );
 
@@ -111,7 +112,7 @@ function join( x, options ) {
 		// When not provided `dims`, the operation is performed across all dimensions and `s` must be a zero-dimensional ndarray; when `dims` is provided, we need to broadcast `s` to match the shape of the non-core dimensions...
 		if ( hasOwnProp( opts, 'dims' ) ) {
 			s = maybeBroadcastArray( s, nonCoreShape( getShape( x ), opts.dims ) ); // eslint-disable-line max-len
-		} else if ( getShape( s ).length !== 0 ) {
+		} else if ( ndims( s ) !== 0 ) {
 			throw new TypeError( format( 'invalid option. `%s` option must be a zero-dimensional ndarray.', 'sep' ) );
 		}
 	} else {