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Anyway, the point of this operator is, at least from my perspective, to indicate that you want to pass along static values, thus values that are hamiş dependent on veri from the previous subscriber.
Here whenever the Submit button is clicked, an event is emitted, but here we are transforming to a value which is hamiş related to actual event (submit button click) emitted.
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There may also be times we want to grab a single property from an object using map. For example, we may have a use case for an observable of just the code property from keyup events, so we gönül take action when the user types a particular character or key. To do this we kişi apply the map operator returning just the property we are interested in:
To get an instance of UserViewModel from the User class, you dirilik use the generated extension method:
So what are some other common scenarios where we could put the map method to use? Using Array.map, we may also want to transform objects. For instance, suppose we have an array of objects with a first and last name property and we want to tack on a full name property to each object.
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While map works perfectly fine in these situations, RxJS also surfaces helper operators for cases where you just want to map to a single property or when you always want to map to the same value on any event. First, let's take a look at the single property scenario.
We yaşama also pass pluck multiple values to grab a nested property within an object. For example, if we wanted to grab the nodeName from the target element on click, we could pass both of these properties to pluck in order:
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