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welcome to this video now maybe you know about our ex chairs and observables and maybe you already created your own observables and worked with them a bit you might have noticed that observables are kind of passive you wrap then you wrap an HTTP request you canamp;#39;t trigger the emission of a new value manually now having that passive approach might not be what you need in some cases maybe you want to be able to emit a new value manually so you want to use that observable like an event emitter where you in your code control then a new value is emitted we can do this with something which is called a subject it inherits from the observable but there we can also call the next method manually to force it to emit a new value and therefore we can have a more active approach of using observables with subjects now that doesnamp;#39;t mean that you should always use subjects just use them if you need to use something like an event emitter letamp;#39;s see this in action in jsfiddle Iamp;
