The map
function is a common operator used in functional programming, and it is available in the rxjs library for JavaScript. The map
function allows you to transform the emitted value of an observable stream into a new value, similar to how the Array map
method works.
To use map
function in the rxjs library, you need to first import it from the library:
index.tsx73 chars3 lines
Once you have imported map
, you can use it to transform the values emitted by an observable. Here's an example:
index.tsx267 chars10 lines
In the code above, we first create an observable that emits the values 1, 2, and 3. We then use the pipe
method to chain the map
operator onto the observable. The map
function takes a callback function as an argument that is used to transform each emitted value. In this case, we multiply each value by 2.
Finally, we call subscribe
on the mappedObservable
to listen for the emitted values. When values are emitted, the subscribed function logs them to the console.
This is a basic example of how to use the map
function in the rxjs library to transform the emitted values of an observable stream.
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