66 lines
1.5 KiB
JavaScript
66 lines
1.5 KiB
JavaScript
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/**
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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 isPrimitive = require( './../../is-primitive' );
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var isFunction = require( './../../is-function' );
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var ITERATOR = require( '@stdlib/symbol/iterator' );
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var isIteratorLike = require( './../../is-iterator-like' );
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// MAIN //
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/**
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* Tests if a value is iterable-like.
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*
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* @param {*} value - value to test
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* @returns {boolean} boolean indicating whether a value is iterable-like
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*
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* @example
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* var bool = isIterableLike( [] );
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* // returns <boolean>
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*
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* @example
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* var bool = isIterableLike( {} );
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* // returns false
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*
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* @example
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* var bool = isIterableLike( null );
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* // returns false
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*/
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function isIterableLike( value ) {
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var f;
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if ( isPrimitive( value ) ) {
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return false;
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}
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f = value[ ITERATOR ];
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return (
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isFunction( f ) &&
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f.length === 0 &&
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isIteratorLike( value[ ITERATOR ]() ) // Why this form? In order to preserve `this`.
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);
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}
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// EXPORTS //
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module.exports = isIterableLike;
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