72 lines
1.6 KiB
JavaScript
72 lines
1.6 KiB
JavaScript
/**
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* @license Apache-2.0
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*
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* Copyright (c) 2019 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 isIteratorLike = require( '@stdlib/assert/is-iterator-like' );
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var hasOwnProp = require( '@stdlib/assert/has-own-property' );
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var incrprod = require( './../../../incr/prod' );
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// MAIN //
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/**
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* Computes the product of all iterated values.
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*
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* @param {Iterator} iterator - input iterator
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* @throws {TypeError} must provide an iterator
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* @returns {(number|null)} product
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*
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* @example
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* var runif = require( '@stdlib/random/iter/uniform' );
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*
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* var rand = runif( -10.0, 10.0, {
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* 'iter': 100
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* });
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*
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* var p = iterprod( rand );
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* // returns <number>
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*/
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function iterprod( iterator ) {
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var acc;
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var v;
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if ( !isIteratorLike( iterator ) ) {
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throw new TypeError( 'invalid argument. Must provide an iterator. Value: `'+iterator+'`.' );
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}
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acc = incrprod();
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while ( true ) {
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v = iterator.next();
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if ( typeof v.value === 'number' ) {
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acc( v.value );
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} else if ( hasOwnProp( v, 'value' ) ) {
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acc( NaN );
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}
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if ( v.done ) {
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break;
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}
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}
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return acc();
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}
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// EXPORTS //
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module.exports = iterprod;
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