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author | Florian Dold <florian.dold@gmail.com> | 2017-05-03 15:35:00 +0200 |
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committer | Florian Dold <florian.dold@gmail.com> | 2017-05-03 15:35:00 +0200 |
commit | de98e0b232509d5f40c135d540a70e415272ff85 (patch) | |
tree | a79222a5b58484ab3b80d18efcaaa7ccc4769b33 /node_modules/fbjs/lib/mapObject.js | |
parent | e0c9d480a73fa629c1e4a47d3e721f1d2d345406 (diff) |
node_modules
Diffstat (limited to 'node_modules/fbjs/lib/mapObject.js')
-rw-r--r-- | node_modules/fbjs/lib/mapObject.js | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/node_modules/fbjs/lib/mapObject.js b/node_modules/fbjs/lib/mapObject.js new file mode 100644 index 000000000..16b7c5b9b --- /dev/null +++ b/node_modules/fbjs/lib/mapObject.js @@ -0,0 +1,50 @@ +/** + * Copyright (c) 2013-present, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under the BSD-style license found in the + * LICENSE file in the root directory of this source tree. An additional grant + * of patent rights can be found in the PATENTS file in the same directory. + * + */ + +'use strict'; + +var hasOwnProperty = Object.prototype.hasOwnProperty; + +/** + * Executes the provided `callback` once for each enumerable own property in the + * object and constructs a new object from the results. The `callback` is + * invoked with three arguments: + * + * - the property value + * - the property name + * - the object being traversed + * + * Properties that are added after the call to `mapObject` will not be visited + * by `callback`. If the values of existing properties are changed, the value + * passed to `callback` will be the value at the time `mapObject` visits them. + * Properties that are deleted before being visited are not visited. + * + * @grep function objectMap() + * @grep function objMap() + * + * @param {?object} object + * @param {function} callback + * @param {*} context + * @return {?object} + */ +function mapObject(object, callback, context) { + if (!object) { + return null; + } + var result = {}; + for (var name in object) { + if (hasOwnProperty.call(object, name)) { + result[name] = callback.call(context, object[name], name, object); + } + } + return result; +} + +module.exports = mapObject;
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