refactor: use dedicated utility for joining array elements

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---

Author: kgryte

lib/node_modules/@stdlib/array/nans/lib/main.js

@@ -26,6 +26,7 @@ var Complex64 = require( '@stdlib/complex/float32/ctor' );
 var full = require( '@stdlib/array/full' );
 var defaults = require( '@stdlib/array/defaults' );
 var dtypes = require( '@stdlib/array/dtypes' );
+var join = require( '@stdlib/array/base/join' );
 var format = require( '@stdlib/string/format' );
 
 
@@ -64,7 +65,7 @@ function nans( length ) {
 	if ( arguments.length > 1 ) {
 		dtype = arguments[ 1 ];
 		if ( !isValidDType( dtype ) ) {
-			throw new TypeError( format( 'invalid argument. Second argument must be one of the following: "%s". Value: `%s`.', DTYPES.join( '", "' ), dtype ) );
+			throw new TypeError( format( 'invalid argument. Second argument must be one of the following: "%s". Value: `%s`.', join( DTYPES, '", "' ), dtype ) );
 		}
 	} else {
 		dtype = DEFAULT_DTYPE;