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For instance, let's start with our initial example, but instead of transforming an array of numbers let's transform an observable of numbers. To do this, we will use the from creation operator to first convert our numbers array into an observable:

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MapTo is a library that programmatically generates the necessary code to map one object to another during compile-time.

To get an instance of UserViewModel from the User class, you can use the generated extension method:

Instead of our function returning a new object, we dirilik instead return just the property we need from that object:

2 github.com/ReactiveX/rxjs/blob/master/src/internal/operators/… source] sums it up; I mean technically I suppose it's fractionally faster since it doesn't increment the index more info :shrug: github.com/ReactiveX/rxjs/blob/master/src/internal/operators/…

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RxJS features many operators that are simply shortcuts for other operators. For example, any time we just want to grab a single property from an emitted value, instead of using map we could use pluck.

The map method does hamiş mutate the existing array, but instead returns a new array. For example, if we were to log the numbers array after calling map, we güç see that it's unchanged:

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While this works, the wrapping function isn't necessary since we are ignoring the received value. For these scenarios you yaşama replace map with mapTo, and simply provide the value you wish to return on all emissions:

birli you emanet see, the map method is extremely flexible with a wide variety of use cases, but how does this translate to map with RxJS, and when would you put this to use with observables?

Like many other helper operators in RxJS, behind the scenes pluck is simply reusing the map operator, passing it a function to grab the appropriate property:

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