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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 ndarraylike2scalar = require( '@stdlib/ndarray/base/ndarraylike2scalar' );
var numelDimension = require( '@stdlib/ndarray/base/numel-dimension' );
var getStride = require( '@stdlib/ndarray/base/stride' );
var getOffset = require( '@stdlib/ndarray/base/offset' );
var getData = require( '@stdlib/ndarray/base/data-buffer' );
var clipIndex = require( '@stdlib/ndarray/base/clip-index' );
var strided = require( '@stdlib/blas/ext/base/gfind-index' ).ndarray;
// MAIN //
/**
* Returns the index of the first element in a one-dimensional ndarray which passes a test implemented by a predicate function within a specified range.
*
* ## Notes
*
* - The function expects the following ndarrays:
*
* - a one-dimensional input ndarray.
* - a zero-dimensional ndarray containing the index from which to begin searching.
* - a zero-dimensional ndarray containing the index at which to stop searching (exclusive).
*
* @param {ArrayLikeObject<Object>} arrays - array-like object containing ndarrays
* @param {Function} clbk - callback function
* @param {*} [thisArg] - callback execution context
* @returns {integer} index
*
* @example
* var scalar2ndarray = require( '@stdlib/ndarray/from-scalar' );
* var vector = require( '@stdlib/ndarray/vector/ctor' );
*
* function clbk( v ) {
* return v % 2.0 === 0.0;
* }
*
* var x = vector( [ 2.0, 1.0, 3.0, 4.0, 5.0 ], 'generic' );
*
* var fromIndex = scalar2ndarray( 1, {
* 'dtype': 'generic'
* });
*
* var toIndex = scalar2ndarray( 4, {
* 'dtype': 'generic'
* });
*
* var v = gfindIndexBetween( [ x, fromIndex, toIndex ], clbk );
* // returns 3
*/
function gfindIndexBetween( arrays, clbk, thisArg ) {
var fromIndex;
var toIndex;
var stride;
var offset;
var idx;
var N;
var n;
var x;
x = arrays[ 0 ];
fromIndex = ndarraylike2scalar( arrays[ 1 ] );
toIndex = ndarraylike2scalar( arrays[ 2 ] );
N = numelDimension( x, 0 );
fromIndex = clipIndex( fromIndex, N );
toIndex = clipIndex( toIndex, N );
n = toIndex - fromIndex;
if ( n <= 0 ) {
return -1;
}
stride = getStride( x, 0 );
offset = getOffset( x ) + ( stride*fromIndex );
idx = strided( n, getData( x ), stride, offset, wrapper, null );
if ( idx >= 0 ) {
idx += fromIndex;
}
return idx;
/**
* Invokes a provided callback.
*
* @private
* @param {*} value - current array element
* @param {NonNegativeInteger} aidx - current array element index
* @param {NonNegativeInteger} sidx - current strided array element index
* @param {Collection} arr - input array
* @returns {*} result
*/
function wrapper( value, aidx ) {
return clbk.call( thisArg, value, aidx + fromIndex, x );
}
}
// EXPORTS //
module.exports = gfindIndexBetween;
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