Setters
Every base var has a built-in event handler to set it's value for convenience, called set_VARNAME.
Say you wanted to change the value of the select component. You could write your own event handler to do this:
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Or you could could use a built-in setter for conciseness.
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In this example, the setter for selected is set_selected. Both of these examples are equivalent.
Setters are a great way to make your code more concise. But if you want to do something more complicated, you can always write your own function in the state.