CODEWITHSUNDEEP
arraysswiftdictionarykey-value-coding
Mark Bridges
Mark Bridges

Reputation: 8448

How to get an array of a property on an object in Swift

I have an array of Tag objects that have a property called tag, which is a string.

public struct Tag {
    public let name: String
}

I would like to get an array of all of these name properties.

Given an array of tags, in Objective-C I would accomplish this with this line:

NSArray *tagNames = [tags valueForKey:@"name"]

How can I achieve the same thing in Swift?

I've tried:

let tagNames = tags.map({ $0.name })

But get a compiler error: "Value of type '[Tag]' has no member 'name'.

Upvotes: 0

Views: 2578

Answers (1)

Greg
Greg

Reputation: 25459

It looks like you have an array which contains another array of Tag objects. This works for me:

let tags = [Tag(name: "tag1"), Tag(name: "tag2"), Tag(name: "tag3")]
let names = tags.map{$0.name }
print("Names: \(names)")

Upvotes: 3

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