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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 normalizeIndex = require( '@stdlib/ndarray/base/normalize-index' );
// MAIN //
/**
* Returns a list of unique indices after normalizing to the interval `[0,max]`.
*
* @param {IntegerArray} indices - indices
* @param {NonNegativeInteger} max - maximum index
* @returns {(IntegerArray|null)} normalized indices
*
* @example
* var idx = toUniqueNormalizedIndices( [ -2, 5 ], 10 );
* // returns [ 9, 5 ]
*
* idx = toUniqueNormalizedIndices( [ 15 ], 10 );
* // returns null
*/
function toUniqueNormalizedIndices( indices, max ) {
var hash;
var out;
var idx;
var i;
hash = {};
out = [];
for ( i = 0; i < indices.length; i++ ) {
idx = normalizeIndex( indices[ i ], max );
if ( idx < 0 ) {
return null;
}
if ( hash[ idx ] === void 0 ) {
hash[ idx ] = true;
out.push( idx );
}
}
return out;
}
// EXPORTS //
module.exports = toUniqueNormalizedIndices;
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