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34 lines
1.1 KiB
34 lines
1.1 KiB
/** |
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* Copyright 2013-2015, Facebook, Inc. |
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* All rights reserved. |
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* |
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* This source code is licensed under the BSD-style license found in the |
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* LICENSE file in the root directory of this source tree. An additional grant |
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* of patent rights can be found in the PATENTS file in the same directory. |
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* |
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* @providesModule keyOf |
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*/ |
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/** |
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* Allows extraction of a minified key. Let's the build system minify keys |
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* without loosing the ability to dynamically use key strings as values |
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* themselves. Pass in an object with a single key/val pair and it will return |
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* you the string key of that single record. Suppose you want to grab the |
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* value for a key 'className' inside of an object. Key/val minification may |
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* have aliased that key to be 'xa12'. keyOf({className: null}) will return |
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* 'xa12' in that case. Resolve keys you want to use once at startup time, then |
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* reuse those resolutions. |
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*/ |
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var keyOf = function(oneKeyObj) { |
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var key; |
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for (key in oneKeyObj) { |
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if (!oneKeyObj.hasOwnProperty(key)) { |
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continue; |
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} |
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return key; |
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} |
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return null; |
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}; |
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module.exports = keyOf;
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