Re: for case and if case (Swift 2)
Re: for case and if case (Swift 2)
- Subject: Re: for case and if case (Swift 2)
- From: Marco S Hyman <email@hidden>
- Date: Thu, 11 Jun 2015 19:48:16 -0700
>> yes ‘=‘ instead of ‘==‘. I hit on that trying random things and don’t really understand it, an ‘=‘ in an if() test is something I’m having trouble getting my brain around.
>
> It’s not that strange. The statement contains an initializer (conceptually 'let a = y.assocatedValue’), so there’s gonna be a “=“. Note that in your original version:
>
>> if case test.two( let a ) == y { }
>
> what’s on the LHS of the “==“ isn’t a value of any kind — what were you expecting the value of ‘a’ to be?
"You extract each associated value as a constant (with the let prefix) or a variable (with the var prefix) for use within the switch case’s body...”
Given that I’d expect if case to act as if I’d done roughly the same thing
with a switch statement
switch test {
case .two(let a)
// do something with .two’s associated value
default:
// do something else
}
Marc
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