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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 gindexOfTruthy = require( '@stdlib/blas/ext/base/gindex-of-truthy' ).ndarray;
// MAIN //
/**
* Returns the index of the last truthy element in a strided array using alternative indexing semantics.
*
* ## Notes
*
* - If the function is unable to find a truthy element, the function returns `-1`.
* - The function explicitly treats `NaN` values as falsy.
*
* @param {PositiveInteger} N - number of indexed elements
* @param {Collection} x - input array
* @param {integer} strideX - stride length
* @param {NonNegativeInteger} offsetX - starting index
* @returns {integer} index
*
* @example
* var x = [ 0.0, 0.0, 3.0, 0.0, 4.0, 0.0, -1.0, 3.0 ];
*
* var idx = glastIndexOfTruthy( x.length, x, 1, 0 );
* // returns 7
*/
function glastIndexOfTruthy( N, x, strideX, offsetX ) {
var idx;
if ( N <= 0 ) {
return -1;
}
// Reverse the iteration order by flipping the stride and adjusting the offset:
offsetX += ( N-1 ) * strideX;
strideX *= -1;
// Find the index of the first truthy element in the reversed "view":
idx = gindexOfTruthy( N, x, strideX, offsetX );
if ( idx < 0 ) {
return idx;
}
// Convert the index from reversed "view" to an index in the original "view":
return N - 1 - idx;
}
// EXPORTS //
module.exports = glastIndexOfTruthy;
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