62 lines
1.3 KiB
JavaScript
62 lines
1.3 KiB
JavaScript
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/**
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* @license Apache-2.0
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*
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* Copyright (c) 2020 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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// MAIN //
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/**
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* Returns the number of singleton dimensions.
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*
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* ## Notes
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*
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* - A singleton dimension is a dimension whose size is equal to `1`.
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*
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* @param {NonNegativeIntegerArray} shape - array shape
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* @returns {NonNegativeInteger} number of singleton dimensions
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*
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* @example
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* var shape = [ 2, 1, 1 ];
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*
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* var n = singletonDimensions( shape );
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* // returns 2
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*
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* @example
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* var shape = [ 2, 2, 2 ];
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*
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* var n = singletonDimensions( shape );
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* // returns 0
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*/
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function singletonDimensions( shape ) {
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var cnt;
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var i;
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cnt = 0;
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for ( i = 0; i < shape.length; i++ ) {
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if ( shape[ i ] === 1 ) {
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cnt += 1;
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}
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}
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return cnt;
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}
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// EXPORTS //
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module.exports = singletonDimensions;
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