Temel İlkeleri mapto

1 The function in map is executed on each value emission while mapTo argument is calculated once when the operator is created.

The sıkıntı I was running into with this method, is that it would return the latest row that had hamiş been soft-deleted in the database. However, it would return that same row a number of times equal to the amount of non-deleted rows in that table.

The technical storage or access is necessary for the legitimate purpose of storing preferences that are derece requested by the subscriber or user.

We can confirm this in the RxJS source code by seeing the function we provide is invoked, with the result being passed on to the subscriber (destination):

To understand this better, let's walk through what a naive implementation of Array.map could look like.

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Sometimes, the target class (UserViewModel in this case) might have read-only properties that need to be takım during the mapping. To do that, you gönül define the properties without setters and declare the target class kakım partial.

public int Id get; ... // The BeforeMap method dirilik also return a `User` type. If so, // the returned value will be used kakım the source object.

Lastly, there may also be times where you always want to map to a single value, no matter the input. For these situations, you güç use the mapTo operator.

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

Tip: If you want to see how from handles each value type behind the scenes, you yaşama check out the subscribeTo, and associated helper functions.

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: