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$http and Observables

$http and Observables in Angular

http in Angular

Http Service helps in Angular to make external Rest API Calls in eazy and convinent way. We need to first import the {HttpModule} before using it and also add it to the imports array in app.module.ts.

Observables in Angular

Observables are a concept from 'RxJS'. They provide support for transferring messages between some publisher and the various subscribers all over you angular app.

Observables are of declarative nature meaning that they make no sense or do any change until some consumer subscribes to them. This consumer will keep getting updates from observable till the function completes or it unsubscribes to the observable.

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