refactor: use base assertion utility

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---

Author: kgryte

lib/node_modules/@stdlib/ndarray/base/ind2sub/lib/assign.js

@@ -20,8 +20,9 @@
 
 // MODULES //
 
-var format = require( '@stdlib/string/format' );
+var isColumnMajor = require( '@stdlib/ndarray/base/assert/is-column-major-string' );
 var trunc = require( '@stdlib/math/base/special/trunc' );
+var format = require( '@stdlib/string/format' );
 
 
 // MAIN //
@@ -94,7 +95,7 @@ function ind2sub( shape, strides, offset, order, idx, mode, out ) {
 		}
 	}
 	if ( offset === 0 ) {
-		if ( order === 'column-major' ) {
+		if ( isColumnMajor( order ) ) {
 			for ( i = 0; i < ndims; i++ ) {
 				s = idx % shape[ i ];
 				idx -= s;
@@ -112,7 +113,7 @@ function ind2sub( shape, strides, offset, order, idx, mode, out ) {
 		}
 		return out;
 	}
-	if ( order === 'column-major' ) {
+	if ( isColumnMajor( order ) ) {
 		for ( i = ndims-1; i >= 0; i-- ) {
 			s = strides[ i ];
 			if ( s < 0 ) {