refactor: explicitly validate a provided input dtype

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---

Author: kgryte

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

@@ -20,16 +20,22 @@
 
 // MODULES //
 
+var contains = require( '@stdlib/array/base/assert/contains' ).factory;
 var Complex128 = require( '@stdlib/complex/float64/ctor' );
 var Complex64 = require( '@stdlib/complex/float32/ctor' );
 var full = require( '@stdlib/array/full' );
+var dtypes = require( '@stdlib/array/dtypes' );
 var defaults = require( '@stdlib/array/defaults' );
+var join = require( '@stdlib/array/base/join' );
+var format = require( '@stdlib/string/format' );
 
 
 // VARIABLES //
 
 var Z128 = new Complex128( 1.0, 0.0 );
 var Z64 = new Complex64( 1.0, 0.0 );
+var DTYPES = dtypes( 'numeric_and_generic' );
+var isValidDType = contains( DTYPES );
 var DEFAULT_DTYPE = defaults.get( 'dtypes.default' );
 
 
@@ -58,6 +64,9 @@ function ones( 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`.', join( DTYPES, '", "' ), dtype ) );
+		}
 	} else {
 		dtype = DEFAULT_DTYPE;
 	}