Object.map causing errors in the browser and some tests #12
Description
There's something weird going on with Object.map. It's causing the following error in Chrome:
Uncaught TypeError: Cannot assign to read only property 'map' of #<Object>
It looks like it's happening inside of React somewhere. Not sure if React defines this, or tries to assign to it?
It happens here:
/**
* 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;