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35 lines
1.1 KiB
35 lines
1.1 KiB
10 years ago
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/**
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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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