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defer

Types​

function defer<GValue>(
  factory: IDefferFactoryFunction<GValue>,
): IObservable<GValue>
interface IDefferFactoryFunction<GValue> {
  (): IObservable<GValue>;
}

Definition​

Creates an Observable, which on subscribe, will call factory and transmit the received emit function to the returned Observable.

Diagram​

Example​

Deferred usage of the variable 'value'​

// let's assume we don't know yet the value to assign
let value: number;

const subscribe = defer(() => single(value));

const destination = (value: number) => {
  console.log(value);
};

// LATER
value = 1;
subscribe(destination); // output '1'

value = 2;
subscribe(destination); // output '2'