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53 lines
1.6 KiB
JavaScript
53 lines
1.6 KiB
JavaScript
/**
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* Copyright 2013 Facebook, Inc.
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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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* @providesModule hasArrayNature
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*/
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/**
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* Perform a heuristic test to determine if an object is "array-like".
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*
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* A monk asked Joshu, a Zen master, "Has a dog Buddha nature?"
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* Joshu replied: "Mu."
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*
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* This function determines if its argument has "array nature": it returns
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* true if the argument is an actual array, an `arguments' object, or an
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* HTMLCollection (e.g. node.childNodes or node.getElementsByTagName()).
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*
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* @param obj An object to test.
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* @return bool True if the object is array-like.
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*/
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function hasArrayNature(obj) {
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return (
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// not null/false
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!!obj &&
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// arrays are objects, NodeLists are functions in Safari
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(typeof obj == 'object' || typeof obj == 'function') &&
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// quacks like an array
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('length' in obj) &&
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// not window
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!('setInterval' in obj) &&
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(
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// a real array
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(Object.prototype.toString.call(obj) === "[object Array]" ||
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// arguments
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('callee' in obj) || // HTMLCollection/NodeList
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'item' in obj)
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)
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);
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}
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module.exports = hasArrayNature;
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