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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';
// MAIN //
/**
* Takes elements from one of two strided arrays depending on a condition.
*
* @private
* @param {PositiveInteger} N - number of indexed elements
* @param {Object} condition - condition array object
* @param {Collection} condition.data - condition array data
* @param {Array<Function>} condition.accessors - array element accessors
* @param {integer} strideC - stride length for `condition`
* @param {NonNegativeInteger} offsetC - starting index for `condition`
* @param {Object} x - first input array object
* @param {Collection} x.data - first input array data
* @param {Array<Function>} x.accessors - array element accessors
* @param {integer} strideX - stride length for `x`
* @param {NonNegativeInteger} offsetX - starting index for `x`
* @param {Object} y - second input array object
* @param {Collection} y.data - second input array data
* @param {Array<Function>} y.accessors - array element accessors
* @param {integer} strideY - stride length for `y`
* @param {NonNegativeInteger} offsetY - starting index for `y`
* @param {Array} out - output array
* @returns {Array} output array
*
* @example
* var toAccessorArray = require( '@stdlib/array/base/to-accessor-array' );
* var arraylike2object = require( '@stdlib/array/base/arraylike2object' );
*
* var condition = [ 1, 0, 1 ];
* var x = [ 1.0, 2.0, 3.0 ];
* var y = [ 4.0, 5.0, 6.0 ];
* var out = [ 0.0, 0.0, 0.0 ];
*
* gwhere( 3, arraylike2object( toAccessorArray( condition ) ), 1, 0, arraylike2object( toAccessorArray( x ) ), 1, 0, arraylike2object( toAccessorArray( y ) ), 1, 0, out );
* // out => [ 1.0, 5.0, 3.0 ]
*/
function gwhere( N, condition, strideC, offsetC, x, strideX, offsetX, y, strideY, offsetY, out ) { // eslint-disable-line max-len, max-params
var cbuf;
var xbuf;
var ybuf;
var cget;
var xget;
var yget;
var ic;
var ix;
var iy;
var i;
// Cache references to array data:
cbuf = condition.data;
xbuf = x.data;
ybuf = y.data;
// Cache references to element accessors:
cget = condition.accessors[ 0 ];
xget = x.accessors[ 0 ];
yget = y.accessors[ 0 ];
ic = offsetC;
ix = offsetX;
iy = offsetY;
for ( i = 0; i < N; i++ ) {
if ( cget( cbuf, ic ) ) {
out[ i ] = xget( xbuf, ix );
} else {
out[ i ] = yget( ybuf, iy );
}
ic += strideC;
ix += strideX;
iy += strideY;
}
return out;
}
// EXPORTS //
module.exports = gwhere;
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