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* @license Apache-2.0
*
* Copyright (c) 2026 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 isString = require( '@stdlib/assert/is-string' ).isPrimitive;
var objectInverse = require( '@stdlib/object/inverse' );
var enumeration = require( '@stdlib/ml/base/kmeans/metrics' ).enum;
// VARIABLES //
var hash = objectInverse( enumeration(), {
'duplicates': false
});
// MAIN //
/**
* Returns the k-means distance metric string associated with a k-means distance metric enumeration constant.
*
* @param {integer} value - distance metric enumeration constant
* @returns {(string|null)} distance metric string or null
*
* @example
* var str2enum = require( '@stdlib/ml/base/kmeans/metric-str2enum' );
*
* var v = str2enum( 'squared-euclidean' );
* // returns <number>
*
* var s = enum2str( v );
* // returns 'squared-euclidean'
*/
function enum2str( value ) {
var v = hash[ value ];
return ( isString( v ) ) ? v : null; // note: we include this guard to prevent walking the prototype chain
}
// EXPORTS //
module.exports = enum2str;
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