refactor: use base array assertion utility

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---

Author: kgryte

lib/node_modules/@stdlib/stats/wilcoxon/lib/validate.js

@@ -20,7 +20,7 @@
 
 // MODULES //
 
-var contains = require( '@stdlib/assert/contains' );
+var contains = require( '@stdlib/array/base/assert/contains' ).factory;
 var isBoolean = require( '@stdlib/assert/is-boolean' ).isPrimitive;
 var isNumber = require( '@stdlib/assert/is-number' ).isPrimitive;
 var isObject = require( '@stdlib/assert/is-plain-object' );
@@ -35,6 +35,9 @@ var format = require( '@stdlib/string/format' );
 var ALTERNATIVE_VALUES = [ 'two-sided', 'less', 'greater' ];
 var ZERO_METHOD_VALUES = [ 'pratt', 'wilcox', 'zsplit' ];
 
+var isAlternativeValue = contains( ALTERNATIVE_VALUES );
+var isZeroMethod = contains( ZERO_METHOD_VALUES );
+
 
 // MAIN //
 
@@ -70,7 +73,7 @@ function validate( opts, options ) {
 		if ( !isString( opts.alternative ) ) {
 			return new TypeError( format( 'invalid option. `%s` option must be a string. Option: `%s`.', 'alternative', opts.alternative ) );
 		}
-		if ( !contains( ALTERNATIVE_VALUES, opts.alternative ) ) {
+		if ( !isAlternativeValue( opts.alternative ) ) {
 			return new Error( format( 'invalid option. `%s` option must be one of the following: "%s". Option: `%s`.', 'alternative', ALTERNATIVE_VALUES.join( '", "' ), opts.alternative ) );
 		}
 	}
@@ -100,7 +103,7 @@ function validate( opts, options ) {
 		if ( !isString( opts.zeroMethod ) ) {
 			return new TypeError( format( 'invalid option. `%s` option must be a string. Option: `%s`.', 'zeroMethod', opts.alternative ) );
 		}
-		if ( !contains( ZERO_METHOD_VALUES, opts.zeroMethod ) ) {
+		if ( !isZeroMethod( opts.zeroMethod ) ) {
 			return new Error( format( 'invalid option. `%s` option must be one of the following: "%s". Option: `%s`.', 'zeroMethod', ZERO_METHOD_VALUES.join( '", "' ), opts.zeroMethod ) );
 		}
 	}