Copies the specified properties from the source object to the target object.
This function is valid in
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Target object to which the properties will be copied.
Source object from which the properties will be copied.
Array of keys for the properties that should be copied from source to target.
Returns a reference to
This function requires the following function which is included automatically:
Every object descended from Object inherits the hasOwnProperty method. This method can be used to determine whether an object has the specified property as a direct property of that object; unlike the in operator, this method does not check down the object's prototype chain.