Convert array items to string on condition - Swift - arrays

Question

I am trying to create a file name from the URL. I have to forcefully remove the first item in the array every time. Like the C# implementation where they check for empty string.
Is it possible to remove the "/" in the array? Is there a better way to implement this?
let url = "https://stackoverflow.com/questions/ask"
var filePathComponents:[String] = []
filePathComponents = assetURL.pathComponents as! [String]
filePathComponents.removeAtIndex(0)
let fileName = "-".join(filePathComponents)

Answer 1

I would recommend
filePathComponents.filter { return $0 != "/" }

Answer 2

You don't have to use mutability if you use range indexing (with ..<).
And to make it convenient to use, let's put it in an extension as a computed property.
Example for String:
extension String {
var pathNameWithoutPrefix: String {
get {
return "-".join(self.pathComponents[2 ..< self.pathComponents.count])
}
}
}
let filePath = "http://stackoverflow.com/questions/ask".pathNameWithoutPrefix
println(filePath) // "questions-ask"
Example for NSURL:
extension NSURL {
var pathURLWithoutPrefix: NSURL? {
get {
if let filePathComponents = self.pathComponents as? [String] {
return NSURL(string: "-".join(filePathComponents[1 ..< filePathComponents.count]))
}
return nil
}
}
}
if let url = NSURL(string: "http://stackoverflow.com/questions/ask"),
let fileURL = url.pathURLWithoutPrefix {
println(fileURL) // "questions-ask"
}
Here's the same extensions for Swift 2:
extension String {
var pathNameWithoutPrefix: String {
get {
let str = self as NSString
return "-".join(str.pathComponents[2 ..< str.pathComponents.count])
}
}
}
extension NSURL {
var pathURLWithoutPrefix: NSURL? {
get {
if let filePathComponents = self.pathComponents {
return NSURL(string: "-".join(filePathComponents[1 ..< filePathComponents.count]))
}
return nil
}
}
}

Answer 3

let linkURL = NSURL(string: "http://stackoverflow.com/questions/ask")!
if let comps = linkURL.pathComponents as? [String] {
let fileName = "-".join(dropFirst(comps)) // "questions-ask"
}
Swift 2.0
let linkURL = NSURL(string: "http://stackoverflow.com/questions/ask")!
if let comps = linkURL.pathComponents?.dropFirst() {
let fileName = "-".join(comps) // "questions-ask"
}

Answer 4

Different approach using the host and path properties of NSURL
if let assetURL = NSURL(string: "http://stackoverflow.com/questions/ask") {
let fileNameWithHost = assetURL.host!.stringByAppendingPathComponent(assetURL.path!) // "stackoverflow.com/questions/ask"
let fileNameWithoutHost = assetURL.path!.substringFromIndex(assetURL.path!.startIndex.successor()) // "questions/ask"
}