Class: DataItemSubject<T>

Defined in: src/sdk/data/DataItemSubject.ts:10

Experimental

A subscribable subject that provides a DataItem value.

Extends

• AbstractSubscribable<Readonly<DataItem<T>>>

Type Parameters

Type Parameter
T

Implements

• MutableSubscribable<Readonly<DataItem<T>>>

Properties

initialNotifyFunc()

protected readonly initialNotifyFunc: (sub) => void

Defined in: src/sdk/sub/AbstractSubscribable.ts:27

A function which sends initial notifications to subscriptions.

Notifies a subscription of this subscribable's current state.

Parameters

Parameter	Type	Description
sub	HandlerSubscription<(v) => void>	The subscription to notify.

Returns

void

Inherited from

AbstractSubscribable.initialNotifyFunc

---

isMutableSubscribable

readonly isMutableSubscribable: true = true

Defined in: src/sdk/data/DataItemSubject.ts:12

Flags this object as a MutableSubscribable.

Implementation of

MutableSubscribable.isMutableSubscribable

---

isSubscribable

readonly isSubscribable: true = true

Defined in: src/sdk/sub/AbstractSubscribable.ts:11

Flags this object as a Subscribable.

Implementation of

MutableSubscribable.isSubscribable

Inherited from

AbstractSubscribable.isSubscribable

---

notifyDepth

protected notifyDepth: number = 0

Defined in: src/sdk/sub/AbstractSubscribable.ts:24

Experimental

Inherited from

AbstractSubscribable.notifyDepth

---

onSubDestroyedFunc()

protected readonly onSubDestroyedFunc: (sub) => void

Defined in: src/sdk/sub/AbstractSubscribable.ts:30

A function which responds to when a subscription to this subscribable is destroyed.

Responds to when a subscription to this subscribable is destroyed.

Parameters

Parameter	Type	Description
sub	HandlerSubscription<(v) => void>	The destroyed subscription.

Returns

void

Inherited from

AbstractSubscribable.onSubDestroyedFunc

---

singletonSub?

protected optional singletonSub: HandlerSubscription<(v) => void>

Defined in: src/sdk/sub/AbstractSubscribable.ts:21

Experimental

Inherited from

AbstractSubscribable.singletonSub

---

subs?

protected optional subs: HandlerSubscription<(v) => void>[]

Defined in: src/sdk/sub/AbstractSubscribable.ts:23

Experimental

Inherited from

AbstractSubscribable.subs

Methods

addSubscription()

protected addSubscription(sub): void

Defined in: src/sdk/sub/AbstractSubscribable.ts:36

Adds a subscription to this subscribable.

Parameters

Parameter	Type	Description
sub	HandlerSubscription<(v) => void>	The subscription to add.

Returns

void

Inherited from

AbstractSubscribable.addSubscription

---

get()

get(): Readonly<DataItem<T>>

Defined in: src/sdk/data/DataItemSubject.ts:44

Gets this item's state.

Returns

Readonly<DataItem<T>>

This item's state.

Implementation of

MutableSubscribable.get

Overrides

AbstractSubscribable.get

---

map()

Call Signature

map<M>(fn, equalityFunc?): MappedSubscribable<M>

Defined in: src/sdk/sub/AbstractSubscribable.ts:174

Maps this subscribable to a new subscribable.

Type Parameters

Type Parameter
M

Parameters

Parameter	Type	Description
fn	(input, previousVal?) => M	The function to use to map to the new subscribable.
equalityFunc?	(a, b) => boolean	The function to use to check for equality between mapped values. Defaults to the strict equality comparison (===).

Returns

MappedSubscribable<M>

The mapped subscribable.

Implementation of

MutableSubscribable.map

Inherited from

AbstractSubscribable.map

Call Signature

map<M>(fn, equalityFunc, mutateFunc, initialVal): MappedSubscribable<M>

Defined in: src/sdk/sub/AbstractSubscribable.ts:183

Maps this subscribable to a new subscribable with a persistent, cached value which is mutated when it changes.

Type Parameters

Type Parameter
M

Parameters

Parameter	Type	Description
fn	(input, previousVal?) => M	The function to use to map to the new subscribable.
equalityFunc	(a, b) => boolean	The function to use to check for equality between mapped values.
mutateFunc	(oldVal, newVal) => void	The function to use to change the value of the mapped subscribable.
initialVal	M	The initial value of the mapped subscribable.

Returns

MappedSubscribable<M>

The mapped subscribable.

Implementation of

MutableSubscribable.map

Inherited from

AbstractSubscribable.map

---

notify()

protected notify(): void

Defined in: src/sdk/sub/AbstractSubscribable.ts:68

Notifies subscriptions that this subscribable's value has changed.

Returns

void

Inherited from

AbstractSubscribable.notify

---

notifySubscription()

protected notifySubscription(sub): void

Defined in: src/sdk/sub/AbstractSubscribable.ts:144

Notifies a subscription of this subscribable's current state.

Parameters

Parameter	Type	Description
sub	HandlerSubscription<(v) => void>	The subscription to notify.

Returns

void

Inherited from

AbstractSubscribable.notifySubscription

---

onSubDestroyed()

protected onSubDestroyed(sub): void

Defined in: src/sdk/sub/AbstractSubscribable.ts:152

Responds to when a subscription to this subscribable is destroyed.

Parameters

Parameter	Type	Description
sub	HandlerSubscription<(v) => void>	The destroyed subscription.

Returns

void

Inherited from

AbstractSubscribable.onSubDestroyed

---

pipe()

Call Signature

pipe(to, paused?): Subscription

Defined in: src/sdk/sub/AbstractSubscribable.ts:207

Subscribes to and pipes this subscribable's state to a mutable subscribable. Whenever an update of this subscribable's state is received through the subscription, it will be used as an input to change the other subscribable's state.

Parameters

Parameter	Type	Description
to	MutableSubscribable<any, Readonly<DataItem<T>>>	The mutable subscribable to which to pipe this subscribable's state.
paused?	boolean	Whether the new subscription should be initialized as paused. Defaults to false.

Returns

Subscription

The new subscription.

Implementation of

MutableSubscribable.pipe

Inherited from

AbstractSubscribable.pipe

Call Signature

pipe<OI, OV>(to, map, paused?): Subscription

Defined in: src/sdk/sub/AbstractSubscribable.ts:219

Subscribes to this subscribable's state and pipes a mapped version to a mutable subscribable. Whenever an update of this subscribable's state is received through the subscription, it will be transformed by the specified mapping function, and the transformed state will be used as an input to change the other subscribable's state.

Type Parameters

Type Parameter	Default type	Description
OI	-	The input type of the mutable subscribable to which to pipe.
OV	unknown	The value type of the mutable subscribable to which to pipe.

Parameters

Parameter	Type	Description
to	MutableSubscribable<OV, OI>	The mutable subscribable to which to pipe this subscribable's mapped state.
map	(fromVal, toVal) => OI	The function to use to transform inputs.
paused?	boolean	Whether the new subscription should be initialized as paused. Defaults to false.

Returns

Subscription

The new subscription.

Implementation of

MutableSubscribable.pipe

Inherited from

AbstractSubscribable.pipe

---

set()

Call Signature

set(value): void

Defined in: src/sdk/data/DataItemSubject.ts:52

Experimental

Sets the value of this subject.

Parameters

Parameter	Type	Description
value	Readonly<DataItem<T>>	The value to set.

Returns

void

Implementation of

MutableSubscribable.set

Call Signature

set(status): void

Defined in: src/sdk/data/DataItemSubject.ts:57

Experimental

Sets the value of this subject to an empty data item.

Parameters

Parameter	Type	Description
status	EmptyValue	The data item status to set, which must be EmptyValue.

Returns

void

Implementation of

UserSetting.set

Call Signature

set(status, value): void

Defined in: src/sdk/data/DataItemSubject.ts:63

Experimental

Sets the value of this subject to a filled data item with a given status and value.

Parameters

Parameter	Type	Description
status	Normal | Failed | NoComputedValue | Testing	The data item status to set.
value	T	The data item value to set.

Returns

void

Implementation of

UserSetting.set

Call Signature

set<S>(status, value): void

Defined in: src/sdk/data/DataItemSubject.ts:69

Experimental

Sets the value of this subject to a data item with a given status and value.

Type Parameters

Type Parameter
S extends DataItemStatus

Parameters

Parameter	Type	Description
status	S	The data item status to set.
value	S extends EmptyValue ? undefined : T	The data item value to set.

Returns

void

Implementation of

UserSetting.set

---

sub()

sub(handler, initialNotify, paused): Subscription

Defined in: src/sdk/sub/AbstractSubscribable.ts:51

Subscribes to changes in this subscribable's state.

Parameters

Parameter	Type	Default value	Description
handler	(v) => void	undefined	A function which is called when this subscribable's state changes.
initialNotify	boolean	false	Whether to immediately invoke the callback function with this subscribable's current state. Defaults to false. This argument is ignored if the subscription is initialized as paused.
paused	boolean	false	Whether the new subscription should be initialized as paused. Defaults to false.

Returns

Subscription

The new subscription.

Implementation of

MutableSubscribable.sub

Inherited from

AbstractSubscribable.sub

---

create()

static create<T>(initialValue, valueEqualityFunc?): DataItemSubject<T>

Defined in: src/sdk/data/DataItemSubject.ts:39

Experimental

Creates a new instance of DataItemSubject.

Type Parameters

Type Parameter
T

Parameters

Parameter	Type	Description
initialValue	Readonly<DataItem<T>>	The new subject's initial value.
valueEqualityFunc?	(a, b) => boolean	The function to use to check for equality between data item values. Defaults to a function that implements default data item value equality semantics: two values a and b are equal if and only if the strict equality operator (===) evaluates to true for a and b, or both a and b are the numeric value NaN.

Returns

DataItemSubject<T>

A new instance of DataItemSubject.

---

DEFAULT_EQUALITY_FUNC()

readonly static DEFAULT_EQUALITY_FUNC(a, b): boolean

Defined in: src/sdk/sub/AbstractSubscribable.ts:19

Checks if two values are equal using the strict equality operator.

Parameters

Parameter	Type	Description
a	any	The first value.
b	any	The second value.

Returns

boolean

whether a and b are equal.

Inherited from

AbstractSubscribable.DEFAULT_EQUALITY_FUNC