CODEWITHSUNDEEP
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Nico
Nico

Reputation: 6359

If statement with multiple conditions in Swift

I have an if statement where I would like to have two conditions like the following :

if let name = json["resource"]["fields"]["name"].stringValue && name.hasPrefix("/")

When I do that, I got an error "Use of unresolved identifier name". What's the solution then?

if let name = json["resource"]["fields"]["name"].stringValue && "test".hasPrefix("/"){

If I do this instead, I got an error "Optional type '$T16' cannot be used as a boolean; test for '!= nil' instead"

It's probably a stupid question but I must confess I'm lost...

Thanks for your help

Upvotes: 4

Views: 3543

Answers (1)

Mick MacCallum
Mick MacCallum

Reputation: 130193

You aren't using a regular if statement, you're using optional binding, and you can't combine the binding with a check on the bound value like that. You could break it up to something like this though.

if let name = json["resource"]["fields"]["name"].stringValue {
    if name.hasPrefix("/") {
        // stuff
    }
}

Edit: Looks like this has changed in Swift 1.2. According to the release notes, it's now possible to add extra conditions to the if let, while let statements:

The “if let” construct has been expanded to allow testing multiple optionals and guarding conditions in a single if (or while) statement using syntax similar to generic constraints:

if let name = json["resource"]["fields"]["name"].stringValue where name.hasPrefix("/") {
    // stuff
}

The code above should achieve what you want. (Untested)

Upvotes: 6

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