_.forIn(object, [iteratee=_.identity])
Iterates over own and inherited enumerable string keyed properties of an object and invokes iteratee for each property. The iteratee is invoked with three arguments: (value, key, object). Iteratee functions may exit iteration early by explicitly returning false.
Arguments
object (Object): The object to iterate over.
[iteratee=_.identity] (Function): The function invoked per iteration.
Returns
(Object): Returns object.