There are total 3 type of subjects each of them again have unique characteristics. lets try to to understand each of them.

Md Sultanul Arefin — Tue, 09 Nov 2021 08:23:53 +0000

Observable and subject both are observable's means an observer can track them. but both of them have some unique characteristics. Further there are total 3 type of subjects each of them again have unique characteristics. lets try to to understand each of them.

Observables

They are cold: Code gets executed when they have at least a single observer.

Creates copy of data: Observable creates copy of data for each observer.

Uni-directional: Observer can not assign value to observable(origin/master).

Subject

They are hot: code gets executed and value gets broadcast even if there is no observer.

Shares data: Same data get shared between all observers.

bi-directional: Observer can assign value to observable(origin/master).

If are using using subject then you miss all the values that are broadcast before creation of observer. So here comes Replay Subject

ReplaySubject

They are hot: code gets executed and value get broadcast even if there is no observer.

Shares data: Same data get shared between all observers.

bi-directional: Observer can assign value to observable(origin/master). plus

Replay the message stream: No matter when you subscribe the replay subject you will receive all the broadcasted messages.

In subject and replay subject you can not set the initial value to observable. So here comes Behavioral Subject

BehaviorSubject

They are hot: code gets executed and value get broadcast even if there is no observer.

Shares data: Same data get shared between all observers.

bi-directional: Observer can assign value to observable(origin/master). plus

Replay the message stream: No matter when you subscribe the replay subject you will receive all the broadcasted messages.

You can set initial value: You can initialize the observable with default value.

convert JSON to multipart/form-data angular/ionic

Md Sultanul Arefin — Thu, 06 Aug 2020 06:21:58 +0000

Aug 6 '20 Comments: 1 Answers: 1

When i send POST request form POSTMAN and get correct response

This is Form-Data Body request of Postman POST.

ENDPOINT : https://cholas.in/wp-json/digits/v1/send_otp

When i send POST request from POSTMAN and get Wrong response

JSON Body request

Content-Type : multipart/form-data

Content-Type : multipart/form-data; header with json body :

Angular and IONIC…

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There are total 3 type of subjects each of them again have unique characteristics. lets try to to understand each of them.

convert JSON to multipart/form-data angular/ionic