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* @license Apache-2.0
*
* Copyright (c) 2024 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' );
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* Resolves an integer index from an integer string.
*
* @private
* @param {string} str - integer string
* @param {NonNegativeInteger} max - index upper bound (exclusive)
* @param {boolean} strict - boolean indicating whether to enforce strict bounds checking
* @throws {RangeError} index exceeds array bounds
* @returns {integer} integer index
*
* @example
* var idx = resolveIndex( '-1', 10, false );
* // returns 9
*
* @example
* var idx = resolveIndex( '-20', 10, false );
* // returns -20
*/
function resolveIndex( str, max, strict ) {
var idx;
var i;
idx = parseInt( str, 10 );
i = normalizeIndex( idx, max-1 );
if ( i === -1 ) {
if ( strict ) {
throw new RangeError( format( 'invalid operation. Index exceeds array bounds.' ) );
}
// Return the non-normalized index, as this should fallback to default property handling and returning "undefined":
return idx;
}
return i;
}
// EXPORTS //
module.exports = resolveIndex;
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