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IObserver

Types​

interface IObserver<GValue> {
  (value: GValue): void;
}

Definition​

An Observer receives and consumes a value.

This is equivalent to a push destination or a RxJS Observer.

It is simply a function with one argument: the received values.

info

A best practice consist of pre-fixing your Observers with $. It's a convenient way to distinguish them from the more classic variables. Example: const $onValues = value => console.log(value);

Example​

Observer that receives a number and logs this value​

const emit: IObserver<number> = (value: number): void => {
  console.log('value:', value);
};

emit(1);
emit(2);
emit(3);

Output:

value: 1
value: 2
value: 3
RxJS equivalent​
new Observer<number>((value: number) => {
  console.log('value:', value);
});