refactor: use string interpolation

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---

Author: kgryte

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

@@ -33,6 +33,7 @@ var ndarray2object = require( '@stdlib/ndarray/base/ndarraylike2object' );
 var reinterpretComplex = require( '@stdlib/strided/base/reinterpret-complex' );
 var reinterpretBoolean = require( '@stdlib/strided/base/reinterpret-boolean' );
 var gscal = require( '@stdlib/blas/base/gscal' );
+var format = require( '@stdlib/string/format' );
 var blockedaccessorassign2d = require( './2d_blocked_accessors.js' );
 var blockedaccessorassign3d = require( './3d_blocked_accessors.js' );
 var blockedaccessorassign4d = require( './4d_blocked_accessors.js' );
@@ -294,7 +295,7 @@ function assign( arrays ) {
 	shy = y.shape;
 	ndims = shx.length;
 	if ( ndims !== shy.length ) {
-		throw new Error( 'invalid arguments. Arrays must have the same number of dimensions (i.e., same rank). ndims(x) == '+ndims+'. ndims(y) == '+shy.length+'.' );
+		throw new Error( format( 'invalid arguments. Arrays must have the same number of dimensions (i.e., same rank). ndims(x) == %d. ndims(y) == %d.', ndims, shy.length ) );
 	}
 	// Determine whether we can avoid iteration altogether...
 	if ( ndims === 0 ) {