refactor: use base array utility

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---

Author: kgryte

lib/node_modules/@stdlib/ndarray/base/assert/is-order/lib/main.js

@@ -20,20 +20,17 @@
 
 // MODULES //
 
+var contains = require( '@stdlib/array/base/assert/contains' ).factory;
 var orders = require( '@stdlib/ndarray/orders' );
 
 
-// VARIABLES //
-
-var ORDERS = orders();
-var len = ORDERS.length;
-
-
 // MAIN //
 
 /**
 * Tests whether an input value is an ndarray order.
 *
+* @name isOrder
+* @type {Function}
 * @param {*} v - value to test
 * @returns {boolean} boolean indicating whether an input value is an ndarray order
 *
@@ -47,15 +44,7 @@ var len = ORDERS.length;
 * bool = isOrder( 'foo' );
 * // returns false
 */
-function isOrder( v ) {
-	var i;
-	for ( i = 0; i < len; i++ ) {
-		if ( v === ORDERS[ i ] ) {
-			return true;
-		}
-	}
-	return false;
-}
+var isOrder = contains( orders() );
 
 
 // EXPORTS //