StringSignal

The StringSignal class monitors a string value.

Properties

PropertyDescription
lastValue
(get) lastValue: string
(set) (Not Available)


Specifies a string that represents the last value of the signal.

Note: The signal value is updated during simulation tick. This means that the value of lastValue is undefined before its first update. It is also undefined for signals that aren't used for any bindings/subscriptions, because those signals aren't guaranteed to be updated at each simulation tick.

Methods

MethodDescription
concat
concat(other: StringSignal): StringSignal


Returns a StringSignal containing the concatenation of the values specified by the input signals.

See Also: ReactiveModule.concat
delayBy
delayBy(timeSpan: {milliseconds: number}): this

Delays a signal. The argument is an object with a "milliseconds" property specifying the delay duration in milliseconds.
eq
eq(other: StringSignal): BoolSignal


Returns a Boolean signal that takes the value of true every time when the value of the left-hand-side signal is equal to the value of the right-hand-side one, and the value of false all other time.

See Also: ReactiveModule.eq
history
history(framesCount: number): StringSignalHistory
history(framesCount: number, initialValues: Array<string>): StringSignalHistory


Returns an object used to access signal values from past frames. The amount of frames tracked is customizable via framesCount parameter.
Historical signal values are going to be initialized with signal value at call time or using initialValues if provided.
monitor
monitor(): EventSource
monitor(config: { fireOnInitialValue: ?boolean}): EventSource


Returns an EventSource that emits an event every time the value of the input signal changes. The event contains a JSON object with the old and new values in the format:

{ "oldValue": val, "newValue": val }


Note: By default, there is no event fired for the initial value of the signal. If config.fireOnInitialValue is set to true then an event for initial signal value is also emitted. oldValue is unset for this initial event.
ne
ne(other: StringSignal): BoolSignal


Returns a Boolean signal that takes the value of true every time when the value of the left-hand-side signal is not equal to the value of the right-hand-side one, and the value of false all other time.

See Also: ReactiveModule.ne
pin
pin(): StringSignal


Returns a StringSignal containing a constant value which is the value of the specified signal immediately after pin is called.
pinLastValue
pinLastValue(): ConstStringSignal


Returns a ConstStringSignal containing a constant value which is the last value of the specified signal before pinLastValue is called.
ConstStringSignal can be passed to a functions which accept strings