Derived signalsEdit this page
Derived signals are functions that rely on one or more signals to produce a value.
These functions are not executed immediately, but instead are only called when the values they rely on are changed. When the underlying signal is changed, the function will be called again to produce a new value.
In the above example, the
double function relies on the
count signal to produce a value.
count signal is changed, the
double function will be called again to produce a new value.
These dependent functions gain reactivity from the signal they access, ensuring that changes in the underlying data propagate throughout your application. It is important to note that these functions do not store a value themselves; instead, they can update any effects or components that depend on them. If included within a component's body, these derived signals will trigger an update when necessary.