Observer

every next(x) value

from Iterator

calls

console.log(x);

import { interval } from 'rxjs';

import { take } from 'rxjs/operators';

 

const observable = interval ( 1000 ) .pipe ( take ( 4 ) );

const observer = {

    next: x => console.log ( x ),

    error: err => console.error ( err ),

    complete: ( ) => console.log ( 'done' )

};

Observer

observable.subscribe( observer );

//output: 0, 1, 2, 3, done

while( iterator.hasNext( ) ) {

Iterator

Observable.create( (observer) =>{

 

 

 

 });

Observable

    let value = iterator.next( ) ;

    console.log(  value ) ;

} 

    observer.next("value1");

    observer.complete();

    observer.next("value2");

Consumer

Pull

Producer

            giveMeData();
        

            return data;
        

            giveMeData();
        

return data;

Consumer

Producer

subscribe();

sendSomeData();

sendSomeData();

sendSomeData();

import { interval } from 'rxjs';

 

const observable = interval ( 1000 ) ;

 

observable.subscribe( x => console.log( x ) );

import { Observable } from 'rxjs';

my custom interval observable

const observable = my5Interval ( 1000 ) ;

observable.subscribe( x => console.log( x ) );

//output: 0, 1, 2, 3, 4, 5

function my5Interval(ms){

 

 

 

 

 

 

 

 

 

 

 

 

}

return Observable.create( (observer) => {

 

 

 

 

 

 

 

 

 

 

});

let count = 0;

const id = setInterval( ( )=>{

 

 

 

 

 

 

 

}, ms);

observer.next(count);

count++;

Observable

uses

observer.next

to push data stream

if(count >=5 ){

    clearInterval( id );

    observer.complete();

}

Observable

pushes end

of data with

observer.complete