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* @license Apache-2.0
*
* Copyright (c) 2023 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 isCollection = require( '@stdlib/assert/is-collection' );
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* Returns the number of ndarray dimensions.
*
* @param {ndarrayLike} x - input ndarray
* @throws {TypeError} must provide an ndarray
* @returns {NonNegativeInteger} number of dimensions
*
* @example
* var zeros = require( '@stdlib/ndarray/zeros' );
*
* var n = ndims( zeros( [ 3, 3, 3 ] ) );
* // returns 3
*/
function ndims( x ) {
var sh;
var n;
// Note: we intentionally avoid rigorous ndarray checks to minimize performance impacts. This obviously means that non-ndarray-like objects can sneak through, but this is likely all right for the purposes of this function...
if ( typeof x !== 'object' || x === null ) {
throw new TypeError( format( 'invalid argument. Must provide an ndarray. Value: `%s`.', x ) );
}
n = x.ndims;
if ( isNonNegativeInteger( n ) ) {
return n;
}
sh = x.shape;
if ( !isCollection( sh ) ) {
throw new TypeError( format( 'invalid argument. Must provide an ndarray. Value: `%s`.', x ) );
}
return sh.length;
}
// EXPORTS //
module.exports = ndims;
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