Since the last entity is mapped last, this means that the DTO mapped from every entity appears to be a duplicate of the DTO mapped from the last entity. But is actually one DTO appearing multiple times.
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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So, a clear difference is that map's callback function hayat generate a value depending on the arguments provided. This is hamiş the case for mapTo, where you just simply provide a value that will be always passed along to the next subscriber in the chain. If you will, mapTo(value) dirilik be though of birli
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If we wanted to transform this into an array of each number multiplied by ten, we could use the map method. To do this, we call map on our numbers array, passing it a function which will be invoked with each value of the source array, returning the number multiplied by ten:
Yet, the creators of RxJs chose to increase complexity by adding an extra method. It seems pointless as such, so I'm suspecting there's more to it than what meets the eye.
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Emits the given constant value on the output Observable every time the source Observable emits a value.
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.
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This (including the commented line) fixed all my issues and returned the correct data. My question is why the first method I mentioned acted in the way that it did.
This attribute gives you more control over how the annotated property should get mapped. For instance, if the annotated property should use a property in the source class with a different name.
When provided an array, the from creation operator will loop through (synchronously) emitting each item in sequence. When we subscribe we güç see each value printed to the console: