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* @license Apache-2.0
*
* Copyright (c) 2025 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var enum2str = require( '@stdlib/stats/base/ztest/alternative-enum2str' );
var str2enum = require( '@stdlib/stats/base/ztest/alternative-str2enum' );
// MAIN //
/**
* Returns the enumeration constant associated with a supported Z-test alternative hypothesis value.
*
* ## Notes
*
* - Downstream consumers of this function should **not** rely on specific integer values (e.g., `TWO_SIDED == 0`). Instead, the function should be used in an opaque manner.
*
* @param {*} value - alternative hypothesis value
* @returns {(integer|null)} enumeration constant or null
*
* @example
* var v = resolve( 'two-sided' );
* // returns <number>
*/
function resolve( value ) {
var t = ( typeof value );
if ( t === 'number' ) {
return ( enum2str( value ) ) ? value : null;
}
if ( t === 'string' ) {
return str2enum( value );
}
return null;
}
// EXPORTS //
module.exports = resolve;
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