60 lines
1.4 KiB
JavaScript
60 lines
1.4 KiB
JavaScript
/**
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* @license Apache-2.0
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*
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* Copyright (c) 2018 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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// MODULES //
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var isCollection = require( '@stdlib/assert/is-collection' );
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// MAIN //
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/**
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* Tests whether all elements in a collection are falsy.
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*
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* @param {Collection} collection - input collection
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* @throws {TypeError} must provide a collection
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* @returns {boolean} boolean indicating whether all elements are falsy
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*
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* @example
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* var arr = [ 0, 0, 0, 0, 0 ];
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*
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* var bool = none( arr );
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* // returns true
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*/
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function none( collection ) {
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var len;
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var i;
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if ( !isCollection( collection ) ) {
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throw new TypeError( 'invalid argument. Must provide a collection. Value: `'+collection+'`.' );
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}
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len = collection.length;
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for ( i = 0; i < len; i++ ) {
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if ( collection[ i ] ) {
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return false;
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}
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}
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return true;
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}
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// EXPORTS //
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module.exports = none;
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