angular2 style guide – property with dollar sign?

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$ suffix (popularized by Cycle.js) is used to indicate that the variable is an Observable.
It could make it to the official style guide too but it’s not there yet

Read more here : What does the suffixed dollar sign $ mean?

Update:
Read more about the trailing “$” sign on Angular website here:
https://angular.io/guide/rx-library#naming-conventions-for-observables

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