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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 double-precision floating-point strided array equal to a corresponding element in another double-precision floating-point strided array using alternative indexing semantics.
*
* ## Notes
*
* - If the function is unable to find an element in `x` which is equal to a corresponding element in `y`, the function returns `-1`.
*
* @param {PositiveInteger} N - number of indexed elements
* @param {Float64Array} x - first input array
* @param {integer} strideX - stride length for `x`
* @param {NonNegativeInteger} offsetX - starting index for `x`
* @param {Float64Array} y - second input array
* @param {integer} strideY - stride length for `y`
* @param {NonNegativeInteger} offsetY - starting index for `y`
* @returns {integer} index
*
* @example
* var Float64Array = require( '@stdlib/array/float64' );
*
* var x = new Float64Array( [ 1.0, 2.0, 3.0, 4.0 ] );
* var y = new Float64Array( [ 0.0, 0.0, 3.0, 0.0 ] );
*
* var idx = dfirstIndexEqual( x.length, x, 1, 0, y, 1, 0 );
* // returns 2
*/
function dfirstIndexEqual( N, x, strideX, offsetX, y, strideY, offsetY ) {
var ix;
var iy;
var i;
if ( N <= 0 ) {
return -1;
}
ix = offsetX;
iy = offsetY;
for ( i = 0; i < N; i++ ) {
if ( x[ ix ] === y[ iy ] ) {
return i;
}
ix += strideX;
iy += strideY;
}
return -1;
}
// EXPORTS //
module.exports = dfirstIndexEqual;
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