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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 getOrder = require( '@stdlib/ndarray/base/order' );
var defaults = require( '@stdlib/ndarray/defaults' );
// VARIABLES //
var DEFAULT_ORDER = defaults.get( 'order' );
// MAIN //
/**
* Resolves the order (i.e. memory layout) of an output ndarray according to a list of input ndarrays.
*
* @param {ArrayLikeObject<ndarrayLike>} arrays - list of input ndarrays
* @returns {string} storage layout
*
* @example
* var zeros = require( '@stdlib/ndarray/zeros' );
*
* var x = zeros( [ 2, 2 ] );
* var y = zeros( [ 2, 2 ] );
*
* var order = outputOrder( [ x, y ] );
* // returns <string>
*/
function outputOrder( arrays ) {
var N;
var o;
var i;
N = arrays.length;
if ( N === 0 ) {
return DEFAULT_ORDER;
}
// Resolve the order of the first ndarray:
o = getOrder( arrays[ 0 ] );
// If a subsequent input ndarray has a different order, return the default memory layout...
for ( i = 1; i < N; i++ ) {
if ( getOrder( arrays[ i ] ) !== o ) {
return DEFAULT_ORDER;
}
}
return o;
}
// EXPORTS //
module.exports = outputOrder;
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