I know that there is this note in Commonly Rejected Changes:
Remove support for default: in switch and just use case _:: default is widely
used, case _ is too magical, and default is widely precedented in many C family
languages.
I really like to use the switch instead of if case for pattern matching, just
because it’s neat block design. I do not want to remove default from switches
because it’s a must have and powerful feature.
I’d like to know why switches must be exhaustive.
switch someValue {
case …:
// Do something
case …:
// Do something else
default:
() // useless nop; do nothing when no pattern matched
}
// VS:
if case … {
} else if case … {
} else if case … {
} // No need for `else`
Can’t we make default optional, or at least on non-enum values?
--
Adrian Zubarev
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