• Walks the expression and apply the given action for each key-value pair.

    Type Parameters

    • T

    Parameters

    • expr: AnyObject

      The expression for the update operator.

    • arrayFilter: AnyObject[]

      Filter conditions passed to the operator.

    • options: UpdateOptions

      The options provided by the caller.

    • callback: Action<T>

      The action to apply for a given path and value.

    Returns string[]