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¿Cómo determinar si una variable BehaviorSubject o no?

Tengo una variable que puede tener el tipo de Date o BehaviorSubject<Date | null> . Quiero saber cómo puedo verificar si la variable es un BehaviorSubject o no.

about 4 years ago · Juan Pablo Isaza
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Si haces esto en JavaScript puedes hacer:

 const behaviorSubject = new Rx.BehaviorSubject(); const isBehaviorSubject = behaviorSubject instanceof Rx.BehaviorSubject;
about 4 years ago · Juan Pablo Isaza Report

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¿Intentaste lo siguiente?

 class BehaviorSubject {} let myVariable = new BehaviorSubject() console.log(myVariable instanceof BehaviorSubject)
about 4 years ago · Juan Pablo Isaza Report
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