Enumerate array of enum cases with filter

Question

Is it possible to enumerate an array of Enum cases with contained values while filtering them in the same line?

Right now I'm doing

let modes = [FilterMode]()
for mode in modes {
    if case .categories(let data) = mode {}
}

What I'd like to do is something like this

for mode in modes where case .categories(let data) = mode {}

Or something like that. Is that currently possible in Swift 3?

Martin R · Accepted Answer · 2017-05-31 11:22:30Z

3

You cannot use pattern matching in the where clause, but you can use for with a case pattern (since Swift 2):

for case .categories(let data) in modes {
    // ... use `data` ...
}

This can also be written as

for case let .categories(data) in modes { ... }

answered May 31, 2017 at 11:12

Martin R

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