Streams.Differential Class
Differential is a Stream that emits differentials of consecutive input values.
It emits start
, update
and end
events.
Constructor
Methods
filter
(
SimpleStream
-
filterFn
Filter converts the current stream into a new stream
that only emits if the filter condition is satisfied.
The filter function should return a Boolean value.
Parameters:
-
filterFn
FunctionFunction to filter event payload
Returns:
SimpleStream:
stream Filtered stream
map
(
SimpleStream
-
mapperFn
Map converts the current stream into a new stream
with a modified (mapped) data payload.
Parameters:
-
mapperFn
FunctionFunction to map event payload
Returns:
SimpleStream:
stream Mapped stream
pluck
(
SimpleStream
-
key
Pluck is an opinionated mapper. It projects a Stream
onto one of its return values.
Useful if a Stream returns an array or object.
Returns:
SimpleStream:
stream Plucked stream
split
(
-
splitterFn
Split maps one of several streams based on custom logic.
The splitter function should return an EventEmitter type.
Parameters:
-
splitterFn
FunctionSplitter function