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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 //
/**
* Returns the index of the first element in a strided array which is less than or equal to a corresponding element in another strided array.
*
* ## Notes
*
* - If the function is unable to find an element in `x` which is less than or equal to a corresponding element in `y`, the function returns `-1`.
*
* @private
* @param {PositiveInteger} N - number of indexed elements
* @param {Object} x - first input array object
* @param {Collection} x.data - first input array data
* @param {Array<Function>} x.accessors - first 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 - second array element accessors
* @param {integer} strideY - stride length for `y`
* @param {NonNegativeInteger} offsetY - starting index for `y`
* @returns {integer} index
*
* @example
* var toAccessorArray = require( '@stdlib/array/base/to-accessor-array' );
* var arraylike2object = require( '@stdlib/array/base/arraylike2object' );
*
* var x = [ 3.0, 5.0, 4.0, 6.0 ];
* var y = [ 2.0, 4.0, 4.0, 5.0 ];
*
* var idx = gfirstIndexLessThanEqual( x.length, arraylike2object( toAccessorArray( x ) ), 1, 0, arraylike2object( toAccessorArray( y ) ), 1, 0 );
* // returns 2
*/
function gfirstIndexLessThanEqual( N, x, strideX, offsetX, y, strideY, offsetY ) { // eslint-disable-line max-len
var xbuf;
var ybuf;
var xget;
var yget;
var ix;
var iy;
var i;
// Cache reference to array data:
xbuf = x.data;
ybuf = y.data;
// Cache a reference to the element accessors:
xget = x.accessors[ 0 ];
yget = y.accessors[ 0 ];
ix = offsetX;
iy = offsetY;
for ( i = 0; i < N; i++ ) {
if ( xget( xbuf, ix ) <= yget( ybuf, iy ) ) {
return i;
}
ix += strideX;
iy += strideY;
}
return -1;
}
// EXPORTS //
module.exports = gfirstIndexLessThanEqual;
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