the function that is called when the Observable is
initially subscribed to. This function is given a Subscriber, to which new values
can be next
ed, or an error
method can be called to raise an error, or
complete
can be called to notify of a successful completion.
Creates a new cold Observable by calling the Observable constructor
a handler for each value emitted by the observable
a promise that either resolves on observable completion or rejects with the handled error
Creates a new Observable, with this Observable as the source, and the passed operator defined as the new observable's operator.
the operator defining the operation to take on the observable
a new observable with the Operator applied
When listening to events such as Event.ChildMoved the snapshot includes the key of the child before this snapshots one. This operator maps to this key.
Registers handlers for handling emitted values, error and completions from the observable, and executes the observable's subscriber function, which will take action to set up the underlying data stream
a subscription reference to the registered handlers
This operator takes the result of .val() for all children of the snapshot and emits them as an array. Contents of source snapshot:
{
childA: { prop: 'Hello' },
childB: { prop: 'World!' },
}
Result of operator:
[
{ prop: 'Hello' },
{ prop: 'World!' },
]
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