Açıklaması mapto Hakkında 5 Basit Tablolar
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Sometimes, the target class (UserViewModel in this case) might have read-only properties that need to be seki during the mapping. To do that, you güç define the properties without setters and declare the target class bey partial.
Here whenever the Submit button is clicked, an event is emitted, but here we are transforming to a value which is derece related to actual event (submit button click) emitted.
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As you kişi see, it is not printing the current input box value, instead it prints the default value. So what mapTo does is, it will evaluate the value usernameInput.value and use the same value birli static one on every emission passing through it.
Sometimes, the target class (UserViewModel in this case) might have read-only properties that need to be set during the mapping. To do that, you gönül define the properties without setters and declare the target class kakım partial.
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Or maybe you need to extract a value from a stream of input events to perform a calculation or initiate a request. Or perhaps you just want to extract a single property from an object, like a key code, to perform another action down the (pipe)line. The scenarios for transforming streams are endless.
A compilation error gets raised by default if the source and destination properties types are derece implicitly convertible, but to convert the incompatible source type to the desired destination type, PropertyTypeConverterAttribute gönül be used.
In this case, subscribeToArray is used. This same helper function is also used to deal with non-observable return values of flattening operators, such birli mergeMap
Takes a constant value birli argument, and emits that whenever the source Observable emits a value. In other words, ignores the actual source value, and simply uses the emission moment to know when to emit the given value.
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