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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 isNonNegativeInteger = require( '@stdlib/assert/is-nonnegative-integer' ).isPrimitive;
var isndarrayLike = require( '@stdlib/assert/is-ndarray-like' );
var base = require( '@stdlib/ndarray/base/prepend-singleton-dimensions' );
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* Returns a read-only view of an input ndarray with a specified number of prepended singleton dimensions.
*
* @param {ndarray} x - input array
* @param {NonNegativeInteger} n - number of singleton dimensions to prepend
* @throws {TypeError} first argument must be an ndarray
* @throws {TypeError} second argument must be a nonnegative integer
* @returns {ndarray} ndarray view
*
* @example
* var array = require( '@stdlib/ndarray/array' );
*
* var x = array( [ [ 1, 2 ], [ 3, 4 ] ] );
* // returns <ndarray>[ [ 1, 2 ], [ 3, 4 ] ]
*
* var y = prependSingletonDimensions( x, 3 );
* // returns <ndarray>[ [ [ [ [ 1, 2 ], [ 3, 4 ] ] ] ] ]
*/
function prependSingletonDimensions( x, n ) { // eslint-disable-line id-length
if ( !isndarrayLike( x ) ) {
throw new TypeError( format( 'invalid argument. First argument must be an ndarray. Value: `%s`.', x ) );
}
if ( !isNonNegativeInteger( n ) ) {
throw new TypeError( format( 'invalid argument. Second argument must be a nonnegative integer. Value: `%s`.', n ) );
}
return base( x, n, false );
}
// EXPORTS //
module.exports = prependSingletonDimensions;
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